A little scenery experiment. Been experimenting with a way to create dredge tailings. The operation of dredges along the creeks and rivers of Northern California was a common way of mining the placer gold. In Trinity County gold dredges were operating as late as 1959. There are many places where dredges once operated along the TCNG. The largest areas of these are now mostly under the waters of Trinity Lake, but a lot of these at the upper portion of the lake are exposed when the lake levels are low. There's a spot on the upper sections of Coffee Creek there was a dredge operated by Mires and Underseath, and that's where I'm experimenting. By using one of the crescent shaped "gravel piles" and manipulating it with the scaling tool, I've been able to sort of recreate some dredge tailings, or alteast give the impression of tailings. Not perfect, but it's a start.
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Here is the satellite image of that area.
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Also, here is a photo and some information on the Mires & Underseth Dredge that came from "Mines & Mineral Resources of Trinity County, CA 1965"
"Mires and Underseath (Abrams, Alcan Mining Company, Coffee Creek, Larsen and Harms, Mires and Garner, Western Mines Company) Dredge. Location: sees. 28, 29, 30, 31, 33, 34, T. 38 N., R. 9 W., M.D., about 12 miles northwest of Carrville. Ownership: Mrs. E. L. Joseph, Helen Gates and Evelyn Spiegelman, 182 Commonwealth Avenue, San Francisco, California.
A partnership including Roy Mires and Carl Underseath purchased a bucketline dredge from the Poverty Hill Dredging Company at La Porte, Plumas County, May 31, 1946, and moved it to Coffee Creek in Trinity County. The dredge was installed on the Monroe placer west of Hickory Creek and started operating about the first of May 1947. The partners had a lease on a strip of land extending about 8 miles along Coffee Creek from the mouth of Union Creek to Big Flat. A camp was built at Hickory Creek to accommodate a crew of 15 men.
The dredge was built on 25 steel pontoons making a hull 100 feet long, 50 feet wide and 7 feet deep. The bucketline carried 82 buckets of 6-cubic-foot capacity, and it was driven by a 100-horsepower electric motor. The trommel was 6 feet in diameter and 30 feet long with 22 feet of tapered holes %-inch to '/2-inch in diameter. It was rotated by a 40-horsepower motor. The staker belt was 30 inches wide and 40 feet long, and it was driven by a 25-horsepower motor. There were eight cross sluices and two downstream sluices 28 inches wide, fitted with rubber-covered wooden Hungarian riffles on each side of the trommel. Quicksilver was used in the top sections of the cross-sluices and in the distributor trough beneath the trommel. Most of the gold was recovered in the distributor.
The gravel was 18 to 30 feet deep, and the bedrock ranged form soft shale to hard serpentine and granite. There were many large boulders.
Electric power was obtained from a General Electric Company 350-kilowatt generator driven by a Busch-Sulzer Bros, diesel engine. Diesel oil was stored in four steel tanks, each 7 feet in diameter and 25 feet long. The dredge was operated on three shifts of 8 hours each with a crew of 20 men.
The dredge was capsized in 1948, and there was no production recorded for that year. In 1949 Mires and Garner (Western Mines Company) operated the dredge from March 1 to November 15. There was no production recorded for 1950, and the dredge was taken over by a San Francisco bank in June. In April, 1951, the Alcan Mining Company, Larsen and Harms) took over the operation of the dredge near Big Flat. The gravel at this location was 35 feet deep to a hard gabbro bedrock and there were many boulders and cobbles. The operation was closed down September 15, 1951, and the dredge was purchased and dismantled for scrap in 1955."
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Some of the dredge tailings on the north end of the lake were from by the Carrville Dredge. Which operated this large dredge. Information came from the same source as the information on the Mires & Understeth dredge.
"Carrville Gold Company Dredge. Location: sec. 8, 17, 20, 29, T. 37 N., R. 7 W., M.D., on the Trinity River near Carrville. Ownership: Thurman and Wright, 625 Market Street, San Francisco, California.
The Carrville Gold Company, Duluth, Minnesota, started operating a bucketline dredge on the Trinity River near Carrville September 15, 1939. The dredge was built by the Yuba Manufacturing Company. The steel hull was 149 feet, 4 inches long, 68 feet wide, and 10 feet deep. The digging ladder was 119 feet long and included 75 buckets of 12-cubic feet capacity. The weight of the digging ladder was supported by an idler pulley in the well. Electric power was purchased from the California Oregon Power Company. Power to drive the digging ladder was furnished by a 400-horsepower motor. The trommel was 8 feet in diameter and 48 feet long with 33 feet of screen having 'X-inch to %-inch holes. The trommel was rotated at 8 revolutions per minute by a 50-horsepower motor. The stacker belt was 42 inches wide and 123 feet long. It was driven by a 50-horsepower motor. Accessory equipment included a D-7 Caterpillar bulldozer, 300-ampere Lincoln arc-welder, an acetylene generator with cutting tools, an Ingersoll-Rand 300-cubic foot capacity air compressor mounted on skids, air-power tools such as chippers, hammers, grinders, drills, and a double-drum winch operated by a 35-horsepower motor. The sluice box cleanup was worked down in a long torn and then ground in a ball mill with quicksilver. The crew varied from 24 to 32 men.
The dredge was closed down during World War II, and no production was reported from 1943 to 1945. Dredging was resumed in March 1946, but a broken tumbler caused a shutdown from July to December. Breakdowns and repair costs where the dredge was digging in sec. 20, T. 37 N., R. 7 W., M.D., made operating unprofitable, and the operation was finally shut down June 1, 1947. It has been idle since. "
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