983 resultados para Lewis and Clark Expedition (1804-1806)


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Written by Nicholas Biddle and edited by Paul Allen.

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Report on a review of the funding for construction of the Lewis and Clark Interpretive Center at Lewis and Clark State Park in Monona County for the period February 25, 1999 through December 31, 2008

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The Golden Messenger Mine which is approximately twenty-three miles northeast of Helena, Montana, near York, on Trout Creek, has long presented several problems of both theoretical and practical interest.

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This thesis is concerned with the beneficiation of an oxidized lead ore. Emphasis was placed upon concentration by flotation rather than by gravity methods, although some investigation was made with the Wilfley shaking table. The concentration of lead minerals received most consideration in the problem, but wherever possible attempts were made to increase the silver and gold concentration along with the lead.

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Mode of access: Internet.