971 resultados para Montana State Bureau of Mines


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Some numbers issued in revised editions.

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Mode of access: Internet.

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Not issued consecutively.

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Title varies slightly

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The smelting of complex lead ores is a difficult operation, especially when they contain considerable amounts of iron and zinc. When these ores are smelted, all of the zinc, which is valuable and well worth recovering, goes into the slag. With the advent of the flotation processes, and the ability of these processes to concentrate the lead and zinc minerals into separate products, the smelting of complex lead ores was to a great extent simplified.

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Work performed at the Battelle Memorial Institute, Columbus, Ohio.

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At head of title, 4- U.S. Dept. of Commerce, Bureau of Mines.

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Mode of access: Internet.