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A testing program was conducted to design a cemented backfill for hydraulic placement in underhand cut and fill mining of a steeply dipping coal seam. The testing evaluated the use of three different backfill aggregates, locally available at the coal mine, with Portland cement and five different pozzolans,including a Class F fly ash, a Class C fly ash, a cement kiln dust and ground smelter slag. Both viscosity and uniaxial compressive strength of backfill mixtures with different pozzolan and Portland cement contents were used to evaluate their suitability. Based upon the results of preliminary testing, an optimum mixture of alluvial sand with six percent Portland cement and ten percent Class F pozzolan was chosen...
Tags: Coal
A pilot program was undertaken to evaluate a process developed by the U.S. Bureau of Mines to recover nickel, cobalt, copper and chromite from domestic nickel laterite resources. An existing five ton per day pilot plant was modified to accommodate treatment of laterite by the Bureau process, which employs reductive roasting, ammoniacal sulfate leaching, solvent extraction, and electrowinning to extract, separate, and recover nickel, cobalt and copper as high purity cathode products. Three distinct types of laterite i.e., limonite, saprolite and a mixture of limonite / saprolite were processed through the plant during three operating campaigns. Nickel cathode was made during all three campaigns, while cobalt cathode...
Tags: Cobalt, Nickel
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Brecciated eruptive rock in crystalline limestone, west of Port Henry. Essix County. New York. 1896.
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Centinel Rock near the junction of Echo and Weber Canyons, Utah. Seventy-two years between this photo and jwh00030. (To see photo pair search on now-then04). Utah. 1941.
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View of massive weathered rock exposure, head of Wigins Creek, head of the Wind River. Fremont County, Wyoming. ca. 1903.
    map background search result map search result map OFR 61-91 - Tables of Annual Production of Gold, Silver, Copper, Lead, & Zinc for the States of California, Idaho, Montana, Nevada, Oregon, Washington. 1991. OFR 65(1)-83 - Reduction of Land Recontouring Costs, Volume I - Texas Lignite Field. 1983. OFR 65(2)-83 - Reduction of Land Recontouring Costs, Volume II - Bituminous Coal Field, Northeast Arizona. 1983. OFR 65(2)-83 - Reduction of Land Recontouring Costs, Volume II - Bituminous Coal Field, Northeast Arizona. 1983. OFR 65(1)-83 - Reduction of Land Recontouring Costs, Volume I - Texas Lignite Field. 1983. OFR 61-91 - Tables of Annual Production of Gold, Silver, Copper, Lead, & Zinc for the States of California, Idaho, Montana, Nevada, Oregon, Washington. 1991.