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The over-all objective of the program was to determine, by laboratory experiments, the kinetics and the mechanics of the various reactions which produce acid in coal mine drainage. Secondary objectives included identification of the role of bacterial catalysts, evaluation of methods to inhibit pyrite weathering, and laboratory application of a new method of weathering inhibition.
This report describes the results of flow tests on the rate and ultimate yield of uranium and pyrite leaching under conditions representative of carbonate in situ uranium leaching. The effects of cation type, pH, carbonate and oxygen concentrations, and flow rate were investigated for uranium leaching. Leachant cation, pH, and carbonate concentration had little effect on uranium leaching, but the leaching rate depended on oxidant concentration to one -half order. The insensitivity to cation type led to a new process whereby the leach solution is preceded by a preflush containing the chloride of the leaching cation. This preflush prevented permeability losses associated with carbonate precipitation and clay swelling...
Tags: Pyrite, Uranium
Natural bornite (Cu5FeS4) leached in ferric chloride or in sulfuric or hydrochloric acid solutions with oxygen showed several differences. In ferric chloride 80% of the copper was leached in two stages. The first (30% copper removal) requiring one minute was controlled by mixed kinetics (liquid ferric ion diffusion and chemical surface reaction). The second was controlled by formation of a surface sulfur layer and then diffusion through the sulfur. With oxygen in sulfuric acid reaction was slow and only the first stage was studied. Copper removal had an induction period. The bornite structure disappeared at 12% copper removal (also found with ferric chloride) and covellite formed on the surface with a species...
This Final Report summarizes the results of work accomplished under Contract No. J0225004. It is in an executive overview or executive summary format. The number and description of the various technical reports prepared and submitted is outlined. The essential changes and reasons for the revised program schedule /contract modifications actually enacted in May 1982 are discussed in detail. The evolving mines /deposits list and the accompanying criteria classifications are explained along with the verifications /justifications for adding or deleting specific mines /deposits to the list. The final section of the report is devoted to presenting Davy McKee's suggestions for improvements to future MAS commodity studies....
Tags: Tin
The Juneau Gold Belt portion of the Juneau Mining District has historically had the greatest mining and exploration activity within the district and is the subject of this report. Between 1880 and 1983, the mines within the Juneau Gold Belt produced 6.7 million oz gold, 3.1 million oz silver, and 45 million lbs lead, all of which had a total value of about $157,000,000. Information in this report is based on an extensive literature search which included unpublished private company reports, U.S. Geological Survey, State of Alaska, and Bureau reports, personal interviews, and Bureau field work. The field work during 1985 revealed the locations of numerous adits, shafts and other old mine workings, many of which were...


map background search result map search result map WMR 043 - Wisconsin Zinc-Lead District. Grant, Iowa & Lafayette Counties, Wisconsin. 1942. WMR 075 - Paxson Mine. Cherokee County, Kansas. 1943. WMR 088 - Proposal for Production of Manganese from Artillery Peak Deposits Flotation and Sintering Plant. Mohave County, Arizona. 1943. WMR 089 - Proposal and Estimate, Production of Crude Iron in Reverberatory Smelting Furnace. Duluth, Minnesota. 1943. WMR 090 - Crane and Chenoweth Mines. Jasper County, Missouri. 1943. WMR 099 - Shamrock Copper. Jefferson County, Montana. 1943. WMR 127 - Boston Consolidated Mine. Salt Lake County, Utah. 1943. WMR 386 - Cartwright Calcite Deposit. Sweet Grass County, Montana. 1945. WMR 392 - Initial Mining Claims, Stillwater Complex. Sweet Grass County, Montana. 1945. WMR 400 - Benbow Area, Stillwater Complex. Stillwater County, Montana. 1945. WMR 407 - American Eagle Mine. Mariposa County, California. 1945. WMR 356 - Basin Gulch Placer Mine. Jefferson County, Montana. 1945. OFR 06(1)-77 - The Impact of Overmining and Undermining on the Eastern Underground Coal Reserve Base. 1977. OFR 85-86 - Juneau Gold Belt Area: Preliminary Mine, Prospect, Sample Location Maps and Descriptions. Alaska. 1986. OFR 128-83 - Investigation of the Mechanics of Mine Acid Formation in Underground Coal Mine Drainage. 1983. WMR 075 - Paxson Mine. Cherokee County, Kansas. 1943. WMR 090 - Crane and Chenoweth Mines. Jasper County, Missouri. 1943. WMR 127 - Boston Consolidated Mine. Salt Lake County, Utah. 1943. WMR 089 - Proposal and Estimate, Production of Crude Iron in Reverberatory Smelting Furnace. Duluth, Minnesota. 1943. WMR 407 - American Eagle Mine. Mariposa County, California. 1945. WMR 386 - Cartwright Calcite Deposit. Sweet Grass County, Montana. 1945. WMR 392 - Initial Mining Claims, Stillwater Complex. Sweet Grass County, Montana. 1945. WMR 043 - Wisconsin Zinc-Lead District. Grant, Iowa & Lafayette Counties, Wisconsin. 1942. WMR 400 - Benbow Area, Stillwater Complex. Stillwater County, Montana. 1945. OFR 85-86 - Juneau Gold Belt Area: Preliminary Mine, Prospect, Sample Location Maps and Descriptions. Alaska. 1986. WMR 088 - Proposal for Production of Manganese from Artillery Peak Deposits Flotation and Sintering Plant. Mohave County, Arizona. 1943. OFR 06(1)-77 - The Impact of Overmining and Undermining on the Eastern Underground Coal Reserve Base. 1977. OFR 128-83 - Investigation of the Mechanics of Mine Acid Formation in Underground Coal Mine Drainage. 1983. WMR 099 - Shamrock Copper. Jefferson County, Montana. 1943. WMR 356 - Basin Gulch Placer Mine. Jefferson County, Montana. 1945.