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comparison of the triangular, polygonal and a statistical method of computing grade and tonnage of ore for the silver Bell Oxide poryhyry copper deposit / Richard F. Hewlett

By: hewlett, Richard F.
Material type: materialTypeLabelBookSeries: U.S. Bureau of Mines. Report of Investigations 7331. Publisher: Washington : U.S. Dept. of the Interior, Bureau of Mines, 1970Description: 33 p. : ill,table.Report number: USBM ri 7331Subject(s): Copper ores -- Grading
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Based on work done in cooperation with the Bear Creek Mining Company and the collegy of Mines, University of Arizona

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