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Science Research Class at Walden School on our second collection trip.

Science Research Class at Walden School on our second collection trip.

After our fall semester, my research science class ended and the two sections of chemistry were consolidated down to one, with me teaching a computer technology course third period instead of chemistry. Without the two classes that could support the Tintic soil analysis project, I had to put the project on hold until I could get some more students involved. We also had an unusually cold January and February, with snow staying on the ground. This hampered our ability to collect samples. Between 3rd and 4th terms we hold a two-week Intersession at Walden School of Liberal Arts that allows us to teach specialty courses, and I dedicated my course entirely to finishing the Tintic project.

Altogether five students took the course, including Jeffery, Indi, Sean, Jem, and Aaron. To finish collecting all the samples, we had to take three additional trips down to the Eureka area. We were fortunate that the weather cooperated and warmed up enough that the snow melted.

Our second collection trip was on March 5 to the area of the Knight Smelter, the cyanide leeching pile, and Silver City. We stopped at the Bullion Beck Headframe on the way to take a group shot.

Ruins of the Knight Smelter built by Jessie Knight to process silver ore.

Ruins of the Knight Smelter built by Jessie Knight to process silver ore.

The Knight Smelter was built by silver tycoon Jesse Knight, who made his initial fortune with the Humbug Mine, then expanded along the Iron Blossom lode. Eventually, Uncle Jesse needed a smelter to concentrate and refine the ores from his mines, and he built it south of Eureka near the Union Pacific line. To connect his mines with the smelter and the Union Pacific main line, he built a narrow gauge railroad so that the smaller engines could make the turns and the steeper grades. A fairly level grade was built around the hills into his mines, and the road I walked on to the Iron Blossom #2 last fall followed this old grade. Jesse Knight contributed quite a bit of money to what was then the fledgling Brigham Young Academy, now Brigham Young University. The Jesse Knight Building, where I had several classes, is named after him.

Tank foundations and kiln at the Knight Smelter

Tank foundations and kiln at the Knight Smelter

The technology for refining ore went through rapid change in the 1920s. The smelter only operated for about four years, at which point it became cheaper to ship the ore by rail to the more modern smelters in Murray. The same thing happened with the Tintic Standard Mine and the reduction mill near Goshen.

There isn’t much left of the Knight Smelter except crumbling foundations for the solution tanks, a few archways where the kilns stood, and a pile of slag. Just to the south is the leeching pile. During the 1980s the price of gold jumped up when we went off the gold standard and the price was allowed to rise. Investing gurus such as Warren Buffet were advising people to invest in gold, and that drove up the price even more. Now, all these old tailings and waste rock piles that hadn’t been economical to process suddenly were. A layer of thick plastic was laid down and the waste rock crushed and piled onto the plastic, then a solution of cyanide was pumped over the pile. The cyanide would chelate with the gold and silver and trickle down through the pile into its lowest area, where it was pumped out and transported for smelting. This same process is being used at the Cripple Creek and Victor gold mine in Colorado.

Collecting a sample inside the kiln at Knight Smelter

Collecting a sample inside the kiln at Knight Smelter

We walked into the old smelter ruins and identified spots where there would likely be contamination, such as inside the kiln and underneath the tanks. We saw that a layer of sand was laid down under the tanks over the original soil, which is now covered with new soil deposited since the 1920s. We also collected samples from the top of the leeching pile. I picked up some samples of slag as well.

This smelter took the original ore and concentrated it by crushing and chemical action, using both physical and chemical separations. Mercury was used to bind to the silver (amalgamation). The amalgam was then heated up in a kiln to drive off the mercury and leave silver and gold. Since the silver started out in a compound with a higher oxidation state (+1) and was now a metal with an oxidation state of 0, this process is also called reduction. There were several reduction mills in the Tintic District. The leftover ore, after heating, still contained appreciable amounts of iron and lead, and was dumped onto a heap in a molten state. This waste material is called slag.

Slag at the Knight Smelter.

Slag at the Knight Smelter.

Sample under the tank foundations. Notice the layering of the soil; a layer of sand was laid down under the tanks when they were first built which is now covered with new topsoil.

Sample under the tank foundations. Notice the layering of the soil; a layer of sand was laid down under the tanks when they were first built which is now covered with new topsoil.

We moved on to the waste rock pile at Silver City where the Swansea Consolidated mine was located. Here, water runoff since the pile was created in the 1980s has washed small gullies fanning out south of the pile, crossing the road, and going on down the valley. The asphalt on the road is stained red with the iron sulfides. We collected on the pile itself, and used a portable pH meter to test the soil at locations on and near the pile. It was still too muddy to walk around much, and we were getting short on time, so we packed back up and drove back to Provo. We collected ten samples from five sites on this trip.

Testing the soil around the Swansea mine dump. The pH is very low, under 3.0.

Testing the soil around the Swansea mine dump. The pH is very low, under 3.0.

Sample at the Swansea Consolidated dump near Silver City

Sample at the Swansea Consolidated dump near Silver City

Welcome to Eureka sign on U.S. 6

Welcome to Eureka sign on U.S. 6

It’s time to take a break from recounting my tour through Colorado’s mining towns last summer and catch you up on what we’ve been doing this year at Walden School of Liberal Arts.

Maples in the fall near Eureka, Utah - with junipers and rabbit brush.

Maples in the fall near Eureka, Utah – with junipers and rabbit brush.

As mentioned earlier, we received a grant from the American Chemical Society to study lead contamination in the soils in Eureka, Utah and the surrounding area. The grant provided funds for travel, equipment, chemicals, and supplies. It took until early October to receive the money, so our first trip down had to wait until mid-October. It meant we wouldn’t have much daylight, but we’d have to do our best.

Canyon of Fire: Maples in the East Tintic Mountains

Canyon of Fire: Maples in the East Tintic Mountains

I’ve been gradually documenting the history of the area, collecting historical photos, taking photos around the town myself, etc. Back in 2009, I took a group of students with me to interview June McNulty, President of the Tintic Historical Society. He showed us through the museum and we videotaped the tour. Now, with this grant, we can tell the story of recent events in Eureka, especially the history of the EPA superfund project over the last ten years that cleaned up or covered up contaminated soils in the town.

TIntic HIgh School from the Godiva Mine site

TIntic HIgh School from the Godiva Mine site

My science research class researched the history of the area during first term while we were waiting for the grant funds. They identified 20 collection sites outside town using GoogleEarth. Some of these are old mine waste dumps, some are around smelter or concentration plants or leeching piles. Others are control sites outside the district. We were going to collaborate with students at Tintic High School, who were to collect from sites in town. Unfortunately, our collaboration fell through, so my students eventually collected from sites inside the town as well.

Valley of maple trees from a mine dump in the East Tintic Mountains

Valley of maple trees from a mine dump in the East Tintic Mountains

In preparation for our sample collection trips, I traveled down to the area to get some photos of fall foliage on Saturday, Sept. 22. I got there just at the right time, when the maples in the canyons were at their brightest. I photographed some areas along Highway 6 leading into town and filmed the maples in the canyons along the road leading over the top to Dividend. I then took videos around town by attaching a Flip camera to my left rearview mirror with a small claw-style tripod. I drove up to the Godiva mine site and took photos down toward the high school, then drove further up the canyon past the Knightsville site and hiked around some mine dumps further up. I had seen that there was a valley nestled inside the East Tintic Mountains from GoogleEarth and my 3D models of the area. There was a road leading along the edge of the hills, and I walked around as far as the site of the Iron Blossom #2 mine. The headframe there has recently collapsed. It was a nice trip and the photos turned out well. I also saw and photographed several deer.

Doe a Deer: A mule deer  doe in the East Tintic Mountains

Doe a Deer: A mule deer doe in the East Tintic Mountains

Ruins of the Irom Blossom #2 Headframe

Ruins of the Irom Blossom #2 Headframe

I took four students to the area on Oct. 19 and we collected samples and explored the area, including the road over Silver Pass. We first collected from some old evaporation ponds near Elberta where hot water pumped out from the Burgin mines was allowed to cool and settle before discharging it into Utah Lake. During the early 1980s, as I drove home from college to my hometown of Deseret, I would pass through this area and see the water steaming as it passed down the gulley to the ponds. This was the last time they had attempted to open the mines at Burgin. We sampled from two locations inside the old ponds, which can be reached by a short walk from Highway 6.

Collecting samples at the settling ponds near Elberta

Collecting samples at the settling ponds near Elberta

We then collected from the bottom of the wash at the mouth of the canyon leading up to Burgin. The soil here looked healthy and contained a combination of sand and humus. We then stopped at the old Burgin concentrator and took some pictures. I talked with the men at the main office of the Chief Consolidated Mine operations there about getting some samples from the tailings piles (they corrected me when I mentioned “tailings piles” around the headframes themselves and said those rocks were more properly called mine dumps or waste rock; tailings are the actual ore that has been processed).

Silver ore concentration plant at the Burgin mine

Silver ore concentration plant at the Burgin mine

We took photos around the Trixie headframe, then drove on up the canyon over the top of Silver Pass, which I had not done before. This was the opening of the deer hunt, so I didn’t want to venture too far from the road without orange clothing.

Headframe at the Trixie Mine above Burgin.

Headframe at the Trixie Mine above Burgin.

We also collected at a mine dump next to the road in Ruby Hollow, which I later identified as the Tesora Mine. The soil there had a bright yellow color and contained obvious sulfides. Part of the shaft is still there without much protection around it.

Collecting samples at the Tesora Mine dump in Ruby Gulch

Collecting samples at the Tesora Mine dump in Ruby Gulch

I also showed the students Silver City, the leeching pile from the 1980s when much of the waste rock and tailings were heaped up and cyanide solution was sprayed onto it, chelating the silver and gold out of the rocks. We stopped at the Bullion Beck headframe for photos and walked around the Tintic Mining Museum. It was late afternoon by then and time to get the students back.

Waste rock pile at the Swansea Consolidated Mine near Silver City

Waste rock pile at the Swansea Consolidated Mine near Silver City

Altogether we collected six samples from three sites and the students had a chance to get to know the area. I knew that we would have to be more productive on our next trips. Back at school, we did some simple pH tests and found the first two sites (Elberta Ponds and Burgin Wash) were near neutral pH, but the Tesora Mine samples were quite acidic, at a pH of about 3.5. Other tests would have to wait until we ordered the testing supplies.

Historic churches in Eureka, Utah.

Historic churches in Eureka, Utah.

Belt-driven drill press at the Tintic Mining Museum

Belt-driven drill press at the Tintic Mining Museum

Downtown Eureka, Utah: 2012Belt-driven drill press at the Tintic Mining Museum

Aerial View of Cripple Creek and Victor Mine

Aerial View of Cripple Creek and Victor Mine

My seventh day touring mining towns in Colorado was spent in the vicinity of Goldfield and Victor in the Cripple Creek Mining District. I traveled to the American Eagles Overlook above the Cripple Creek and Victor Gold Mine and hiked on the Vindicator Valley Trail above Goldfield.

Headframe and Shops at the American Eagles Mine

Headframe and Shops at the American Eagles Mine

Since I had arrived in camp rather late the night before, I took all of the morning to recharge my batteries, literally and figuratively. My long trip the day before which started in South Fork and traveled through Creede, Lake City, and Gunnison had used up all the spare batteries I had for all my cameras, and I was still exhausted myself. I showered in the headquarters building of the KOA and finished setting up camp, making up my tent and sleeping bag for tonight. Then I spent the rest of the morning charging up my various camera batteries and spares in the game room while reading an old Andre Norton book on my iPad.

American Eagles Headframe

American Eagles Headframe

Finally in the afternoon I headed out, driving south and taking the gravel road up to the overlook. It crosses the main road used by the ore trucks taking overburden to the dump locations. I stopped on the way to look at the open pit mine operations of the Cripple Creek and Victor Mining Company, which is a wholly-owned subsidiary of AngloGold Ashanti. They are digging a huge pit down through what was the old Cresson Mine (the same mine that discovered the huge vug back in 1914, basically a large geode the size of a room lined with 60,000 troy ounces of gold). I’ll speak more about the open-pit mine tomorrow, because I took an excellent tour of it. While observing the operation, I used a time-lapse app on my iPad to record the huge trucks driving their loads out of the pit.

Panorama of the Cripple Creek and Victor Open Pit Gold Mine

Panorama of the Cripple Creek and Victor Open Pit Gold Mine

The American Eagles Mine was the highest mine in the district at 10,570 feet with one of the deepest shafts at 1540 feet. The land around it is a small spot of green surrounded on all sides by the CC&V operations. From there, one can see all the way to the Collegiate Peaks in the west and to Pike’s Peak to the northeast. Winfield Scott Stratton, whose famous Independence Mine turned him from an itinerant carpenter into the richest man in the district, bought the American Eagles Mine in 1895 as part of his consolidation of mines in the area. Today, the old headframe still stands with its double hoist and cage. Several out buildings, such as the shifter’s house and blacksmith shop, still stand as well. I spent a very pleasant hour at the top, reading the signs and enjoying the cool breeze.

Dumping Overburden from the CC&V Open Pit Mine

Dumping Overburden from the CC&V Open Pit Mine

Vindicator Valley with Headframe and Mill

Vindicator Valley with Headframe and Mill

On the way back down, I stopped and hiked the Vindicator Valley trail. This area lies between the overlook and the town of Goldfield. It includes the Vindicator Mine and Mill, with a large steel headframe and the decaying remains of the mill. I walked along the path, which is about 2 miles total. In places it was a bit of an uphill hike, and I should have been tired by the altitude, but I have grown acclimated and I actually felt better and more vigorous that I do at my normal 4500 feet.

Sign for the Vindicator Mine and Mill

Sign for the Vindicator Mine and Mill

All through the valley are many remnants of mining structures, such as powder magazines, ore bins and transport systems, headframes, and mills. Some of the structures have been moved here to preserve them from the CC&V operations. The company seems to have a real interest in preserving the history of the area, and Colorado overall does a much better job of this than Utah, where the only value seems to be to close the mines, cover the dumps, and pretend mining never happened.

Steel Headframe for the Vindicator Mine

Steel Headframe for the Vindicator Mine

Other structures I passed included the LaBella steam powered electric plant that was at the bottom of the trail and powered the operations in the area, the Gold Knob Mine (seen as wooden cribbing toward Goldfield), and the Theresa Mine headframe. This mine was active from about 1895 through the 1950s. It was closed during World War II, as was all gold and silver mining in the country. By the time the mines reopened, so much work was needed to repair and upgrade them that most of the mines closed. It wasn’t until the 1970s that gold operations started up again, mostly leaching of old low-grade mine waste and some small open pit operations. But in the 1990s a large-scale open pit mining operation was engineered and begun which is now the CC&V mine. As the mine has grown, so have the piles of overburden rock, seen on the upper slopes of Vindicator Valley.

LaBella Electric Plant Site

LaBella Electric Plant Site

From photos I’ve seen of what the area around Victor looked like in the early 1900s, things have changed quite a bit. Many of these mines, such as the Theresa, were worked off and on from the 1890s through the 1950s, and many original wooden headframes were eventually replaced by steel headframes.

Theresa Mine Headframe

Theresa Mine Headframe

Some structures were torn down for scrap metal, others were destroyed by time. Some, such as the Lillie Mine and Mill, were bought out by other companies (such as the Vindicator Mine or the Gold Cycle Mining Group owned by David Moffat and A. E. Carlton, which bought up many of the defunct claims) and their buildings were torn down and foundations buried by waste rock. In the 1970s and 80s much of this waste rock (huge piles of it) were dug up and processed using the leach pile method to recover gold from the marginal ores. This changed the look of the valley and moderated it. The CC&V mine has done a lot to reclaim the slopes and replant native species, such as areas of pine trees growing throughout the valley. They have reinforced some of the structures and built the trail systems with interpretive signs.

Anna J. Mine looking up Vindicator Valley to the American Eagles Overlook.

Anna J. Mine looking up Vindicator Valley to the American Eagles Overlook.

Powder Magazine. The explosives had to be kept separately from the mines to prevent accidental destruction.

Powder Magazine. The explosives had to be kept separately from the mines to prevent accidental destruction.

After this walk I drove into Victor at sunset to try to buy a steak for supper, but the small grocery store only had hamburger. I did take some good photos of the town in nice lighting. Back at camp, sunset lingered as I cooked supper and took some additional photos of the grass and aspens around camp.

A Sign in Victor, Colorado explaining the bawdy side of town.

A Sign in Victor, Colorado explaining the bawdy side of town.

The Fortune Club in Victor, Colorado, known for its . . . er . . . entertainment.

The Fortune Club in Victor, Colorado, known for its . . . er . . . entertainment.

Third Street in Victor, Colorado.Third Street in Victor, Colorado.

The Back Side of Pike's Peak

The Back Side of Pike’s Peak

Aspens and Colorado Blue Spruce at my camp.

Aspens and Colorado Blue Spruce at my camp.

Parked along the switchbacks from Slumgullion Pass

Parked along the switchbacks from Slumgullion Pass

I came to Lake City from the south along Highway 149, driving from Creede along the headwaters of the Rio Grande River over the Continental Divide at Spring Creek Pass (10,901 feet). After staying on the high plateau, the road climbs again to Slumgullion Pass at 11,361 feet. It then descends toward Lake City, taking a series of dramatic switchbacks. At one hairpin turn, there is a nice overlook of Lake San Cristobal and Lake City. I stopped to look at the interpretive signs and take a few photos.

The San Juan Mountains of Southwestern Colorado

The San Juan Mountains of Southwestern Colorado

I parked along the old main street of town and found a nice old-fashioned soda fountain, the San Juan Soda Company, in a store next to the historic Miners and Merchants Bank. I had a tasty mint chocolate chip shake, which really hit the spot. I asked for directions and drove northeast out of town up Henson Canyon about two miles in a slight drizzling rain for the Hard Tack Mine.

Entrance to the Hard Tack Mine near Lake City, Colorado

Entrance to the Hard Tack Mine near Lake City, Colorado

As I always do, I asked the tour guide if I could videotape the tour, and he told me to check with the owner, who was in the main office next to the mine entrance. She was afraid that I would show their tour to “the competition” and refused to let me videotape it, although she said that photographs were allowed. I tried to assure her that my reporting should help business, but she wasn’t convinced. At least this would give me a chance to take more photographs. As things turned out, I’m glad I didn’t tape the tour. The guide was fairly new, having only done this about two months. He was from out of state, and was unable to answer questions about the types of minerals found here or how mining began around Lake City (which you would think would be standard background any guide would know). Hopefully he’s done more homework since.

Mucking Machine Diagram in the Hard Tack Mine

Mucking Machine Diagram in the Hard Tack Mine

The tour itself was disappointing compared with other tours I’ve taken on my trip through Colorado. To begin with, the Hard Tack Mine wasn’t a mine at all; it was originally blasted as an adit to reach other mines further up the mountain but was abandoned after reaching only 350 feet. No ore was ever struck. The current owners came in, cleaned out the old works, blasted a few way stations to hold exhibits, brought equipment in from other places, and called it a “mine tour.” Now, if I had never been on any other mine tours (such as the one in Creede just this morning, which was far superior) then I might have learned some interesting things about hard rock mining. But the other tours at least had tour guides who had been miners and knew their stuff, and their displays were better designed and more detailed. And their mannequins were less cheesy.

Jack leg drill display in the Hard Tack Mine

Jack leg drill display in the Hard Tack Mine

There were a few good things about this tour. The displays had some illustrated signs that did a good job explaining how the drills and other equipment worked. The signs were on paper inside plastic sleeves and were hard to photograph because they didn’t lie flat, but I did the best I could. There was also a good mineral exhibit and some photographs of the mining in the area. But the tour didn’t last very long nor was it very informative. There is a museum in town that no doubt gives more details about the history of the area, but my time was short – I wanted to get to Victor before nightfall. I’ve had to do some further research on my own.

Lake City Colorado from Highway 149

Lake City Colorado from Highway 149

Lake City, Colorado is the county seat of Hinsdale County and the only incorporated town in the county, which is the most sparsely populated county in Colorado. This should tell you something about how remote the town is from just about anywhere else; although it is not very far as the eagle flies from Lake City to Ouray or Silverton, you need a good four-wheel drive vehicle to make it over Engineer or Cinnamon Pass. This silver camp is located on the west slope of the continental divide along Colorado Highway 149, northwest of Creede and southwest of Gunnison.

Lake City in 1881

Lake City in 1881

The same caldera eruptions that brought veins of silver, gold, lead, zinc, and copper to the San Juan Mountains also placed veins in this area, cut into by glaciers to form the rugged peaks and ridges of the San Juans. About 800 years ago, a large earthflow filled the canyon and damned off the Lake Fork of the Gunnison River, creating Lake San Cristobal, the second largest natural lake in Colorado. Lake City is located in a dell about three miles below this natural dam. The slide itself is called the Slumgullion Slide, because its brownish-orange color studded with boulders reminded the early miners of slumgullion stew, a beef stew with onions, carrots, and potatoes.

Lake San Cristobal above Lake City, Colorado

Lake San Cristobal above Lake City, Colorado

This area was home to various Ute tribes, especially the Tabeguache Tribe led by Chief Ouray. They originally ranged from the San Luis Valley through the San Juans. But their range was reduced through several treaties, ending with the Brunot Treaty of 1873, which moved the Utes to the Uintah-Ouray Reservation in Eastern Utah.

Lake City winter

Lake City winter

Even before the treaty was ratified, prospectors were heading into the San Juans, pressing south along Lake Fork to the area around Lake San Cristobal. One party of six men, led by Alferd Packer, got caught in deep snows as they tried to hike to the Los Pinos Indian Agency near Saguache. They ran out of food and even ate their shoe leather to try to stay alive. Only Packer made it to the station.

Alferd Packer. You would not want to hire this man as a tour guide . . .

Alferd Packer. You would not want to hire this man as a tour guide . . .

Later that year, the bodies of the other five men were found dead at the base of Slumgullion Pass and showed signs of foul play and cannibalism. Packer had seemed well enough fed, and was spending money from several different wallets. He was arrested and charged with murder, escaped, was captured seven years later and convicted of murder in the Hinsdale County Courthouse. He was retried in Gunnison and found guilty again, then sentenced to 40 years. He was later pardoned by the Governor of Colorado. He always claimed he had killed one of the men in self-defense, and that another man, the oldest of their party, had died of natural causes and was probably eaten by the others.

The Golden Fleece mines above the Slumgullion Slide.

The Golden Fleece mines above the Slumgullion Slide.

Other prospectors discovered claims, which were staked out and filed just as soon as the treaty was complete. The first big strike was the Golden Fleece claim discovered by Enos Hotchkiss (who also built the first cabin in the area of what is now Lake City). He and Henry Finley and D. P. Church were building a toll road between Silverton and Saguache in 1874 when he located rich gold ore by the lake. By 1875, Lake City was incorporated as a town, and became the county seat. Within a few years over 500 structures had been built and mining had extended all the way into the valleys and passes above Lake San Cristobal. The town itself became an important jumping off, resupply, and smelting point.

Illustrated map of Lake City, Colorado

Illustrated map of Lake City, Colorado

In 1889 the Denver and Rio Grande Railroad built a narrow gauge line in from the north and the ores could now be transported much more cheaply. Otto Mears built toll roads over the passes from Silverton and Ouray to Lake City and charged $2.25 per passenger for the daily stagecoach runs. It would take two days to make the bone-jarring ride, and the stages would stop over at Rose’s Cabin, originally built in 1874 by Corydon Rose as a one-story log cabin. It eventually grew into a saloon and hotel, stable, store, post office, and cultural center for the mining claims in the area.

Downtown Lake City, Colorado

Downtown Lake City, Colorado

Lake City reached its peak population of about 6000 around 1900, but the writing was already on the wall. The Silver Panic of 1893 cut the price of silver so much that it doomed much of the mining in the San Juan Mountains and elsewhere in Colorado and throughout the West. Only those mines that contained enough gold and other ores to ride out the downturn were able to survive. Now maybe 500 people live there year-round.

Soda fountain in Lake City, Colorado

Soda fountain in Lake City, Colorado

The last train out of Lake City left on May 25, 1933. After the railway was abandoned, Mike Burke, owner of the Ute-Ulay Mine, had a 1928 Pierce Arrow automobile remodeled with train wheels so it could run on the tracks. It was called the Galloping Goose because of its tendency to weave back and forth on the rails.

Silver ore from the Ute-Ulay Mine near Lake City, Colorado

Silver ore from the Ute-Ulay Mine near Lake City, Colorado

The Ute-Ulay (or Ule) Mine is one of the more famous in the area, with over $10 million worth of silver and lead extracted. Its mill was used as late as 1983, but now the buildings, mill site, boarding house, tram line, etc. are decaying and in danger of collapsing under heavy winter snows. The current owners, LKA International, have donated the land to Hinsdale County and options are being looked at to renovate the structures and remediate the tailings pile and pit near the mill.

Miners at the Black Creek Mine near Lake City, Colorado.

Miners at the Black Creek Mine near Lake City, Colorado.

The county invited in the nonprofit Colorado Art Ranch to put together the Hardrock Revision Team, a group of seven artists to find creative ways to utilize the property while maintaining its historic appeal. Some ideas include turning the over 100 miles of tunnels into a large Aeolian harp, converting the water tank into a camera obscura, covering the roofs of the buildings with protective tarps painted with mining scenes, and turning the tailings pit into an ice skating rink once it has been remediated. This is not a bunch of outsiders coming in to tell the community what to do – it was initiated by Lake City citizens. It will be interesting to see what happens, and perhaps I’ll have to stop when I come this way again. Here is a link to the article I found on this project: http://www.hcn.org/issues/43.20/can-an-old-mine-become-a-work-of-art/article_view?b_start:int=0. I just wish similar efforts could happen in Utah before the state shuts all our mining history down or all the old structures collapse into oblivion.

Mining structures in the Lake City area

Mining structures in the Lake City area

As I left the Hardtack Mine, I drove north out of Lake City on Highway 149 and left the San Juan Mountains behind. North of Lake City, large basalt flows continue all the way to the Black Canyon of the Gunnison. I joined U.S. 50 nine miles west of Gunnison and stopped to gas up. Now I was on a familiar road – I’ve traveled most of the length of U. S. 50 at one time or another. I’ve been on this section with my children 10 years ago when I was last in the San Juans.

Captain John W. Gunnison, for whom many towns and places are named in Colorado and Utah. His 1853 survey expedition was attacked by a Pahvant war party in Oct., 1853 west of Deseret, Utah.

Captain John W. Gunnison, for whom many towns and places are named in Colorado and Utah. His 1853 survey expedition was attacked by a Pahvant war party in Oct., 1853 west of Deseret, Utah.

Captain John William Gunnison left his name all over Colorado and into central and western Utah, but not in Nevada. He never made it that far. As a Captain of the Army Corps of Topographical Engineers, he was commissioned in 1853 to survey a route for the transcontinental railroad between the 38th and 39th parallels. U.S. 50 and parts of the Denver and Rio Grande Railroad follow the route his team surveyed. They discovered the gorge of black basalt and the river that bears his name. Once they reached Utah, they surveyed along the Sevier River near the site of Gunnison, Utah and passed through Leamington Canyon into the Pahvant Valley. Fearing the approach of winter, he sped up the work by splitting his team into two groups. His half of the party surveyed a large meander in the Sevier River where the Gunnison Bend Reservoir is now located. Several miles further down the river, west of what is now Deseret (my hometown), they were attacked by Pahvant Utes on the warpath. Of eleven men in the group, only three survived. Gunnison was killed. I travelled east on U. S. 50, thinking about how Deseret would be different if Gunnison had finished his survey and the transcontinental railroad had followed that route instead of the more northern route it took.

Hidden Treasure Mine near Lake City, Colorado

Hidden Treasure Mine near Lake City, Colorado

I became so sleepy that I had to pull over and take a nap for an hour, then press on. Clouds gathered as I drove up into the Sawatch Range and it began to drizzle. I had intended to take the tramway to the top of Monarch Pass, but I was behind schedule and it wouldn’t have been much of a view in the rain, so I pressed on. I drove into Buena Vista and ate supper at a burger place, then tried to get the phone number for the KOA campground outside of Victor that I was going to stay at. It was getting dark and I wanted to let them know I was going to be late coming in. My wife looked up the number for me (somehow I had forgotten to write it down with all my other contact information when planning this trip) as I drove east on U.S. 24. I had to double back to find a spot with cell tower reception in order to get the number, but was not able to get through to the campground. They must have already closed the office.

The Road to Gunnison

The Road to Gunnison

By now it was completely dark, so once again I travelled this highway in the night, the last time being in 2010 when we drove out to Denver, stopping in Cripple Creek. Now I was returning to complete the visit I made then. At least I had driven this route once in the daytime, back in September, 2009 on my way back from Philadelphia, and had good photos of the scenery.

My route from Lake City to Victor, Colorado on July 14, 2012.

My route from Lake City to Victor, Colorado on July 14, 2012.

I was getting very tired by the time I got to Divide and turned south. I took the turn toward Victor, but somehow missed the KOA in the dark and wound up driving all the way into town. I turned around and headed back. I almost missed the sign again. The KOA is located just south of the turnoff to Victor, and I arrived about 11:00. The manager had left a map for me in the entranceway to the office with my site circled, a tent site on the outer edge of the camp. It took a couple of drives around the camp before I found the right trail leading off to the tent sites. Mine was Site 1, nestled back in the aspens with good privacy. I was too tired to make camp, so I just rearranged my gear, setting stuff outside like the tent that I knew bears wouldn’t get in to, and made a fairly good bed in the back of my minivan.

Rio Grande River Valley, on the way to Creede, Colorado.

Rio Grande River Valley, on the way to Creede, Colorado.

Saturday, July 14, 2012 was the sixth day of my trip through Colorado’s mining history. I started in South Fork and travelled through Creede, Lake City, Gunnison, Buena Vista, and finally wound up near Victor. It was a long drive, but I stopped for some interesting tours and explorations along the way.

Campsite at South Fork. There wasn't much privacy.

Campsite at South Fork. There wasn’t much privacy.

My campsite in South Fork was very tiny and right next to the community center and I was trying to cook breakfast and break camp as people literally walked through my camp to set up a bake sell in the common room. Here’s a photo to show it. The tent trailer next to me almost hung over my picnic table. But despite the lack of privacy, I did manage to get packed up and ready to go at a reasonable time.

Main Street in Creede, Colorado.

Main Street in Creede, Colorado.

I drove north on Highway 149 toward Creede, following the Rio Grande River. The valley here is wide and flat, the obvious result of valley glaciers during the last ice age. Going back much further than that, about 60 million years ago, the Farallon tectonic plate was pushing under the North American Plate at a faster rate than normal, wrinkling up the western part of the continent like a rug on a wooden floor. The last great orogeny (mountain building episode) pushed up the Rocky Mountains and was called the Laramide Orogeny. The San Juan Mountains, which I have been exploring all week, were the final uplift and are the youngest mountains in Colorado. Eventually, the North American Plate slowed down and the Farallon Plate finally subducted beneath. As it pealed away, a wave of volcanic activity followed it as the melting plate became magma that rose to the surface.

Volcanic Activity in the San Juan Mountains.

Volcanic Activity in the San Juan Mountains.

In the newly formed San Juans, the rising magma created a system of andesitic volcanoes that exploded and spewed ash and tuft throughout the region. The empty magma chambers collapsed to form calderas, and around their rims veins of ore-bearing igneous rocks were injected into fault lines and cracks. These veins became the great silver and gold mining districts I’ve visited all week.

Creede, Colorado in 1942.

Creede, Colorado in 1942.

In the area of Creede, about five overlapping calderas exploded and collapsed; silver-bearing ore was injected into fractured rock at the edge of the caldera. In 1889, these silver deposits were discovered and began the final great silver mining camp in Colorado. It was the fastest, wildest, and richest of the boomtowns and the population reached 10,000 by 1891.

Creede Main Street looking north into Willow Creek Canyon.

Creede Main Street looking north into Willow Creek Canyon.

Denver went through a wave of gambling and saloon reforms in the early 1890s, and many of the most famous casino owners and con men moved here to set up shop, including Jefferson Randolph “Soapy” Smith II. He sold his Tivoli Club in Denver and moved to Creede. He swindled local property owners out of their deeds and took over a large section of Creede’s business district, setting up his gang in various fronts for his confidence schemes. He soon announced himself as camp boss, and controlled all of the gambling and organized crime in the district. He appointed his brother in law as deputy sheriff, and the two of them established some order to the rough and tumble town, throwing out troublemakers. Soapy opened up a gambling hall called the Orleans Club in 1892. He purchased a “petrified man” nicknamed McGinty and had him placed on display.

Cast of Characters in Creede, Colorado.

Cast of Characters in Creede, Colorado.

Later in 1892 he got word that the reforms in Denver were coming to an end, so he returned to Denver. Shortly after, a large part of Main Street burned down in a fire, including the Orleans Club.

Bat Masterson (standing) and Wyatt Earp in 1876, when they were deputies in Dodge City, Kansas.

Bat Masterson (standing) and Wyatt Earp in 1876, when they were deputies in Dodge City, Kansas.

Another well-known figure that came to Creede was Robert Ford, the man that shot Jesse James. He arrived in early 1892 and set up a dance hall, but after a drunken night spent shooting windows out along Main Street, he was about to be driven out of town when the Soapy Smith gang insisted that he stay. Ford’s dance hall was burnt down in the fire on June 5, 1892 and he set up a temporary saloon in a tent until he could rebuild. Three days after the fire, on June 8, Edward O’Kelley walked into the saloon, called Ford by name, then shot him twice in the chest with a shotgun. Ford died instantly.

Bat Masterson

Bat Masterson

Another famous Old West character that found his way to Creede was William Barclay “Bat” Masterson. In his early days, he was a deputy sheriff in Dodge City, Kansas, along with Wyatt Earp. Bat eventually became county sheriff, at the same time that his brother, Ed, was town marshal. When Ed was killed by a cowboy named Jack Wagner, Bat avenged his death and had to leave town. He went to work for Wyatt Earp in Tombstone, Arizona running the faro tables at the Oriental Saloon.

Map of mines in the Creede Mining District.

Map of mines in the Creede Mining District.

When Bat’s other brother, Jim, was threatened by men in Dodge City, Bat returned and engaged in a shootout in the town plaza where one man was wounded. Bat was fined $8 and asked to leave town again. He moved to Denver where he dealt faro at a gambling house and became friends with Soapy Smith. He moved with Soapy to Creede in 1892 and managed the Denver Exchange Club until it, too, burned down in the fire. Bat was known for being a dapper man who enjoyed wearing a bowler hat. He was also known as an irrepressible practical joker.

Map of the Bachelor Loop scenic trail north of Creede.

Map of the Bachelor Loop scenic trail north of Creede.

Other characters that stopped by Creede during its boom years were “Poker” Alice Tubbs and Martha “Calamity Jane” Burke.

Woodcarving lessons in the Creede Community Center.

Woodcarving lessons in the Creede Community Center.

As if the 1892 fire wasn’t bad enough, in 1893 the Sherman Act was repealed by congress and the Silver Panic began, with prices for silver dropping from $1.29 to about $.50 per ounce. Almost as soon as it began, the boom was over and Creede began to die. Most mines closed, but a few kept working and others consolidated until 1930, when all mining ceased. Some additional mining occurred in the late 1930s by the Emperius Mining Company, and the Bulldog Mountain vein system was discovered in the 1960s, with mining along the vein conducted by the Homestake Mining Company until 1985. Overall, nearly 5 million tons of ore have produced over 84 million ounces of silver and substantial amounts of lead, zinc, copper, and gold (the big five).

Creede Underground Mining Museum map. The mine tour and community center were blasted out of the side of Willow Creek Canyon.

Creede Underground Mining Museum map. The mine tour and community center were blasted out of the side of Willow Creek Canyon.

Some of the leading mines were the Bachelor Mine high up in a notch in West Willow Creek Canyon, the Commodore Mine lower down the same vein, the Amethyst Mine further up the canyon, the Last Chance high on the hill above the Amethyst, and the Bulldog complex to the west of Willow Creek. A large mill, called the Humphreys Mill, was located at the junction of East and West Willow Creek Canyons. The mill’s foundations can still be seen. The earliest mines in the district were discovered west of town around the Sunnyside area, such as the Solomon and Holy Moses mines. The town cemetery is located there now.

Model of the Bulldog Mine.

Model of the Bulldog Mine.

After looking around Main Street, I drove further up the canyon to where the Creede Undergound Mining Museum and community center are located. I was surprised to see a lot of cars filling up the parking lot, and was lucky to find a place to park. A large woodcarver’s convention was being held in the community center, and I enjoyed watching the vendors teaching classes. I think I have a hobby decided on for when I retire, if ever; I’d like to do a combination of wood burning and painting, perhaps of some of the mining towns and scenery I’ve seen on this trip.

Native copper in the Creede Underground Mining Museum.

Native copper in the Creede Underground Mining Museum.

I joined a tour of the Underground Mining Museum, which was built partially from an old tunnel that has been enlarged into a loop tour, with the community center blasted out in the middle. It had a good display of minerals and posters of mining terms, with some illustrations. After videotaping the tour itself, I backtracked around the loop with my camera and took photos, so this tour is better documented than some of the others I took where I couldn’t take still photos very well while running my video camera.

Mucker machine as it was found in the Big Six Mine.

Mucker machine as it was found in the Big Six Mine.

Some of the unusual aspects of this tour (which was a very thorough overview of hard rock mining) included a slusher, which is a type of dragline used to pull blasted rock fragments away from the face, a description of how fuses were measured (the person cutting fuses would wind them around wooden pegs set one foot apart), a honey car (an outhouse on wheels), an accurate recreation of a stope, a good assayer’s office, a hoist and skip station, and a description of the local geology.

Open stope in the Big Six Mine.

Open stope in the Big Six Mine.

After the tour I drove further up East Willow Creek Canyon and saw the remains of the Humphreys Mill, then drove up West Willow Creek. High on the hill was the Bachelor Mine, and lower down the Commodore, with its large ore house. The slope is so steep that extensive cribbing is needed. I drove a little further up, but the gravel road became too steep and too rough for my minivan. Perhaps some other time I can come this way with a 4-wheel drive. Further up the canyon are the Amethyst and Last Chance, and I’ve found some photos of them taken by the Mining History Association.

Measuring fuses. The fuses would be wound around the peg to get precise lengths.

Measuring fuses. The fuses would be wound around the peg to get precise lengths.

I drove out of town around noon and headed west and north on Highway 149. I came over a small pass with displays and beautiful views of the Weminuche Wilderness and the headwaters of the Rio Grande River. It was a nice chance to see both ends of the river. I have been down near the mouth of the Rio Grande in Laredo, Texas and now I’ve seen the other end.

Assayer's office, with balance, crushers, and bone crucibles. To the left is the furnace for fire assaying.

Assayer’s office, with balance, crushers, and bone crucibles. To the left is the furnace for fire assaying.

Honey car in the Creede Underground Mining Museum. OK, I'll say it: whoever had to clean this out each day had a really crappy job. . .

Honey car in the Creede Underground Mining Museum. OK, I’ll say it: whoever had to clean this out each day had a really crappy job. . .

Humphreys Mill in East Willow Creek Canyon.

Humphreys Mill in East Willow Creek Canyon.

Site of Humphreys Mill today.

Site of Humphreys Mill today.

Ruins of mines in West Willow Creek Canyon. The Bachelor Mine is high up on the hillside and the Commodore Mine at the bottom.

Ruins of mines in West Willow Creek Canyon. The Bachelor Mine is high up on the hillside and the Commodore Mine at the bottom.

The Bachelor Mine.

The Bachelor Mine.

The Commodore Mine #5 Level adit.

The Commodore Mine #5 Level adit.

Commodore Mine ore house and chutes. Ore was hauled from the adit across a bridge to the top of the tipple.

Commodore Mine ore house and chutes. Ore was hauled from the adit across a bridge to the top of the tipple.

Amethyst Mine

Amethyst Mine

Last Chance Mine (photo by the Mining History Association).

Last Chance Mine (photo by the Mining History Association).

Weminuche Wilderness sign and road map.

Weminuche Wilderness sign and road map.

Headwaters of the Rio Grande River in Colorado.

Headwaters of the Rio Grande River in Colorado.

Mine near Silverton, Coloado

Mine near Silverton, Coloado

My exploration of the Mayflower Mill took quite a bit of time, but it was worth detouring back to Silverton just to see it. I was quite hungry by the time I finished, but I stopped at some interpretive signs along the road back to town, including a road map of the area showing the roads over Cinnamon and Engineer Passes to Lake City. I would like to explore these routes, but knew my minivan was no match for those passes. I’ll take the long way round.

History of mining around Silverton, Colorado.

History of mining around Silverton, Colorado.

Closer to Silverton was a display on the tailings from the Mayflower Mill and a description of the Silver Lake Mill across the valley, as well as the mansion called Waldheim that was built by Edward and Lena Stoiber, who also built the mill. It was eventually sold to the Guggenheims and demolished for salvage in the 1940s.

Mayflower Mill and tailings pile. The Silver Lake Mill was across the Animas River from the Mayflower.

Mayflower Mill and tailings pile. The Silver Lake Mill was across the Animas River from the Mayflower.

Back in Silverton, I found a promising place to eat and had a tasty lunch of buffalo chicken wings at Handlebar’s Restaurant and Saloon. Certainly much better than the place I ate at on Tuesday. The train crowd was leaving by the time I finished and the town was more relaxed.

Main Street in Silverton, Colorado.

Main Street in Silverton, Colorado.

I had one more attraction to see on my Silverton Heritage Pass, and that was the San Juan County Historical Society Mining Heritage Center housed in the old Silverton jail. Downstairs was an excellent exhibit of local minerals, and the jail itself was interesting. From the jail, you pass through a tunnel and connect with another building to see the Heritage Museum. It had good displays of mining equipment and how it was used, including engineer’s transits, safety equipment, and general artifacts from the town itself.

Gold ore from the San Juan Mountains on display in the Silverton museum.

Gold ore from the San Juan Mountains on display in the San Juan County Historical Society Mining Heritage Center in Silverton.

More gold ore in the Silverton museum.

More gold ore in the Silverton museum.

Silverton got its start after the Brunot Treaty of 1873 opened the area to settlement and pushed the Ute Indians out. Almost immediately mining began in the area and continued until 1991 when the last mine shut down. At its height in the 1880s, Silverton’s population reached 3000, with many coming from European countries. The mines advertized in foreign newspapers and promised land and wealth. Usually the younger male members of families came first, hoping to save enough money to send for the rest of their families.

Silver ore from the San Juan Mtns., on display in the Silverton museum.

Silver ore from the San Juan Mtns., on display in the Silverton museum.

Silverton was a rough town, with gambling, saloons, and other forms of recreation that led to the need for a good jail. Built in 1902, the jail was rarely empty. The jailer’s family lived on the main floor and the cells were on the top floors, with storage in the basement. Eventually, as mining dwindled and the population decreased, the jail was shut down and used to store artifacts for a proposed museum, which finally opened in 1965. Now, a large addition has become the Mining Heritage Center.

Copper ore on display in the Silverton, Co. museum.

Copper ore on display in the Silverton museum.

After completing my tour, I drove out of town on Highway 550 and crossed over Molas Pass again, returning to Durango for the third time in five days. I did stop at the train station one last time, but they still had not seen my hat. Oh well! I drove on out of town on Highway 160 toward Pagosa Springs.

Typical mine blacksmith shop, recreated in the Silverton Heritage Museum.

Typical mine blacksmith shop, recreated in the Silverton museum.

It was a pleasant drive, threatening rain but never more than a light drizzle. It’s about 60 miles from Durango around to Pagosa Springs, which surprised me for being such a large town. I didn’t stop to explore, as I was already behind schedule to get to my camp for the night. It must have a fairly large airport judging from the midsized jet I saw taking off.

Progression of miner's hats and lamps.

Progression of miner’s hats and lamps.

Highway 160 continued on to Wolf Creek Pass. I stopped at a scenic pullout along the switchbacks leading up to the pass and could see a long way down a glacial valley to the west. This is the site of one of the old songs by C. W. McCall, called “Wolf Creek Pass.” The song follows the misadventures of truck driver Earl and his companion, whose 1948 Peterbilt 18-wheeler goes out of control driving down Wolf Creek Pass, until they crash into a feed store in Pagosa Springs, losing most of their cargo of chickens along the way.

Miner's carbide lamp and cross-section diagram.

Miner’s carbide lamp and cross-section diagram.

I looked at Earl and his eyes was wide

His lip was curled, and his leg was fried.

And his hand was froze to the wheel like a tongue to a sled in the middle of a blizzard.

I says, “Earl, I’m not the type to complain

But the time has come for me to explain

That if you don’t apply some brake real soon, they’re gonna have to pick us up with a stick and a spoon…”

(“Wolf Creek Pass” written by Bill Fries and Chip Davis, sung by C.W. McCall)

Drill steals, including single and double jacks and Leyner drill bits.

Drill steals, including single and double jacks and Leyner drill bits.

Interestingly enough, another song by C. W. McCall is entitled “Black Bear Road” and talks of the legendary jeep route between Telluride and Ouray. Since I started out in Ouray this morning, I’ve definitely been in C. W. McCall country.

Jail cell in the old Silverton, Colorado jail.

Jail cell in the old Silverton, Colorado jail.

But the funny thing is, C. W. McCall never existed. It was a pseudonym of songwriter Bill Fries who, along with Chip Davis, worked for an advertising company in Omaha. They were hired to do a marketing campaign for the Metz Baking Company, which made Old Home Bread. They came up with a trucker named C. W. McCall who delivered Old Home Bread to the Old Home Filler-Up and Keep On a Truckin’ Café, where he meets with waitress Mavis Davis. The commercials were a big hit and won the Clio Award. Bill and Chip decided to take the C. W. McCall persona on the road, and released several “outlaw country” albums. In 1976 they ignited the citizen band radio craze with the song “Convoy,” which earned them a gold record.

Mine engineer's surveying transit.

Mine engineer’s surveying transit.

While on the road, Chip began experimenting with a fusion of medieval music with modern instruments and synthesizers and created the group called Mannheim Steamroller. The first album was rejected by all the major record labels, so Chip set up his own record label called American Gramaphone. Their Fresh Aire albums, especially the Christmas albums, are still among my favorite.

1930s photo of Silverton, Colorado with a large mill complex in the background.

1930s photo of Silverton, Colorado with a large mill complex in the background.

Bill Fries eventually moved to Ouray, Colorado and was elected mayor there in 1986.

View from Wolf Creek Pass toward Pagosa Springs.

View from Wolf Creek Pass toward Pagosa Springs.

It was raining a bit more heavily as I crossed over Wolf Creek Pass but lightened up as I headed down into South Fork. I had a reservation at a large RV park a short distance up Highway 149. I had set up the reservation long before I had the trouble with my tire and had to modify my itinerary; originally, I was going to come in from the north on Highway 149. Fortunately, even though I was late, the manager was still in the office making bread for a bake sale in the commons room. My camping spot was right next to this room and the spot was so narrow my tent was literally wedged between the building and my neighbor’s pop-up tent. I covered my tent with a tarp in case of rain and to keep out the bright light on the side of the building. I ate supper, got my electronics charged up, uploaded my photos, and slept well despite the light.

Sign near the Silverton Museum detailing the history of the area.

Sign near the Silverto museum detailing the history of the area.

Howardsville

Howardsville, Colorado on the Animas River.

So far on my tour through Colorado’s mining history, I have reported on how the ore was mined. Today, I got the chance to see how the ore was transported and processed at a mill. After completing my tour of the Old Hundred Mine near Silverton, I drove back down Stony Creek to where it joins the Animas River at a place called Howardsville, where some mining operations were still evident.

Arrastra Gulch

Google Earth view of Arrastra Gulch and Silver Lake. The Mayflower Mill is located at the bottom of the gulch in the upper left corner.

I stopped along the way toward Silverton at the base of Arrastra Gulch. This is the location of the main mining area around Silverton and one of the richest deposits in all of the San Juan Mountains. Before a proper mill could be built to process the ores, a Spanish-style arrastra was built here, which is a circular area with a flat stone floor and a central post with arms coming out. Each arm had a heavy stone or iron weight that hung from it and which would drag over the ore and crush it. Mules, donkeys, or even humans would be used to push the arms around in a circle. Once mills were built, the ore was transported to them from Arrastra Gulch and the high glacial circque above it (around Silver Lake) by tramlines or flumes. At one point as many as four separate overlapping trams were operating.

Arrastra Gulch marker panel a

Arrastra Gulch marker Part 1

The largest mill in the area was the Mayflower Mill (also known as the Shenandoah-Dives Mill) about two miles northeast of town. It was built in 1929 to process gold, silver, zinc, lead, and copper ores. Another large mill nearby was the Silver Lake Mill on the Animas River.

arrastra trams

Map of aerial trams in Arrastra Gulch near Silverton, Colorado.

Built of pre-framed Oregon fir and completed in six months for $373,000, the Mayflower Mill began processing ore in Feb., 1930 and continued in operation for 49 of the next 61 years, finally closing down in 1991. It is in fact still capable of operation, and all the original equipment is intact. The historical society allows self-guided tours that start in the machine shop, then move to the tram station, ore storage bins, ball mills, flotation cells, recovery system, assay office, etc.

Arrastra

A restored arrastra in Groveland, California. Heavy rocks were dragged around in a circle to crush ore.

It was an extensive operation, the biggest in the San Juan Mountains, and employed the latest technologies available in 1929, including the new techniques of ball mill crushers, froth flotation of sulfide ores, and recovery of base metals as well as gold and silver. These techniques are still used today in such places as the concentration plant at Utah’s Rio Tinto/Kennecott Copper operation, although the scale there is enormous.

Shenandoah-Dives mine

A sketch showing what the Shenandoah-Dives mine looked like during the 1930s. The aerial tramline connected with the Mayflower Mill.

For its 61 years of operation, it processed over 9,700,500 tons of ore to produce 1,940,100 ounces of gold, 30,000,000 ounces of silver, and over 1,000,000 tons of base metals.

Tramway in Arrastra Gulch

The aerial tramline connecting the Shenandoah-Dives Mine above Arrastra Gulch with the Mayflower Mill. The gulch is the canyon in the foreground, and the high circque is the basin around Silver Lake.

I used my camcorder to create a complete walkthrough of the mill, going in order from start to finish. At each stop I would stop the tape and take photos as well, and took my time to document everything. There were interpretive signs at each stop explaining what each piece of equipment did. Here is a rundown:

Mayflower Mill

The Mayflower Mill near Silverton, Colorado. A self-guided tour is available during the summer.

Processing Ore

The ore coming from the mines was about 5% metals and 95% waste rock (tailings). The metals have to be separated out, and this is done in stages so that all the metals (gold, silver, copper, lead, and zinc – the big five) could be individually removed and purified. This is done in three main steps: crushing, separation or reduction, and purification. The final step was done by a smelter off-site, but the first two steps were done at the mill.

tram station

Tram station at the Mayflower Mill. Full buckets descended from the mine by gravity, which also pulled the empty buckets back up.

The ore arrived in large open buckets by tramline. Gravity brought the ore down and allowed the empty buckets to move back up the loop. The ore was brought into the mill at the tram station and dumped, then transported by conveyor belt to the cone crushers. It was screened for size, and if too big would be returned to the crushers.

cone crusher

Cone crusher at the Mayflower Mill. It would crush the ore between rotating cones until it was pebble sized.

Once it was pebble sized, it would be transported to the Fine Ore Bin, which would hold 1200 tons of ore, enough for one full day of operation. The ore was then transported out of the bottom of the bin and mixed with water to form a slurry, then passed through a rod mill (which used long iron rods rolling around) where the ore was further crushed to a fine powder and sorted by a spiral classifier, an auger-like device that pushed the ore upward. If the ore was fine enough, it was pushed all the way to the top – if not, it would fall back down and be returned to the rod mill for further crushing.

rod mill

Rod mill at Mayflower Mill. Iron rods were fed into the mill, then allowed to roll around inside to crush the ore to the size of sand grains.

The powder, now the consistency of sand, was passed through a ball mill, with 2-3 inch diameter iron balls rolling around to crush the ore even finer. These balls were added frequently during the day through pipes from a ball bin. Now the ore was now the consistency of talc and fine enough to start to separate.

Spiral classifier

Spiral classifier at the Mayflower Mill. Ore slurry from the rod mill would be pushed up the spiral. If it was fine enough, it would be pushed over the top. If not, it would return to the rod mill.

The first metal to be separated was gold, using a system of settling jigs that pumped the ore through, allowing the heavier gold particles to settle out through vibration and suction. The lighter remaining material was passed on to flotation cells, where reagents and flocculents were added that would float the desired metals to the top of the tank solution while depressing or sinking the other metals. Lead was removed first, then copper, and finally silver and zinc removed in large tanks. The soapy bubbles would simply be skimmed off the top of the cells.

Ball mill

Ball mill at the Mayflower Mill. Ore crushed to the size of sand grains would enter the rotating drum and be crushed to powder by 2-3 inch iron balls.

The flotation cell solutions were then passed through filters with pumps that pushed the water through, drying out the solution to a damp cake-like material that was then shipped to a smelter for final refining, where it would be heated to drive off the sulfides. Each day, samples were removed and filtered through a squeeze press, then sent away to an assayer to determine the percentage of metals in each day’s run.

gold jigs

Gold jigs at the Mayflower Mill. Using air pressure, the lighter ore powder was suctioned away from the heavier gold particles.

Meanwhile, the gold filtered out by the jigs was sent through a concentration process. It would be passed over a shaking Deister table where the gold would be caught by riffles and formed a streak to be collected. It was mixed or amalgamated with mercury to remove the gold from the remaining waste ore. The amalgam was then formed into rounded boats or cakes and heated in a retort at 1200 ° F for 12 hours to evaporate the mercury, which was bubbled through water to condense it for reuse. The remaining gold was now called “sponge” and was about 80% pure. It would be sent off to a foundery for final purification. Four to five sponges would be produced each week. Each sponge weighed about 22 pounds. During the last year of the  mill’s operation (1991), a new process was developed that eliminated the need for mercury (which was highly toxic).

Lead cleaner cells

Lead flotation tanks at the Mayflower Mill. Reagents were added that would float the various metals, such as copper or lead, to the top of the liquid on soap bubbles which were skimmed off into the trough in front. The remaining metals were depressed to the bottom. Impellers would keep the solution agitated while blowing air through it.

Once processed, the waste material is called tailings and was made up of water and sandy ground rock. It was pumped down to settling ponds, where the solid tailings would settle out. This was an innovation of the Mayflower Mill, as previously the tailings would simply be allowed to flow into the Animas River. The high sulfur and iron content in the tailings would travel down the river and created the reddish stains on the rocks that I noted on my train trip up the gorge several days ago. At the Mayflower Mill, the ponds were shifted so that the solid tailings would build up a series of mounds downhill from the mill. These have now been collected into a large tailings pile near the mill.

Deister table

Deister table at the Mayflower Mill. It would shake, causing the gold particles to separate out against the riffles.

I found this self-guided tour to be fascinating from a chemistry perspective. The mill used a system of physical separations to crush, concentrate, and amalgamate the ore. The final smelting used a system of chemical separations. It is a perfect example of a chemical engineering process, and was continually upgraded and improved during its 61 years in operation. The mill could be run, during the night shift, with only three people. During the day there were additional people to do repairs and take samples, to run the gold process, and to run the machine shop. Shift supervisors oversaw the operation from the dog house, one man ran the crusher facility, and one man ran the flotation cells. This was the biggest operation of its kind in southwest Colorado and processed more ore than any other mill in the area.

gold sponge

A model of what gold sponge looked like after being removed from the retort furnace. The holes in it are caused by mercury vapor bubbling out.

Retort furnace

Retort furnace and gold button mold at the Mayflower Mill. The gold particles would be amalgamated with mercury, then heated in this retort furnace to drive the mercury off.

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