Comparison of the triangular, polygonal, and a statistical method of computing grade and tonnage of ore for the Silver Bell Oxide porphyry copper deposit / by Richard F. Hewlett.
|Main Author:||Hewlett, Richard F.|
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 
Based on work done in cooperation with the Bear Creek Mining Co., and on a fellowship agreement with the College of Mines, University of Arizona.
ii, 33 p. :
ill., maps ;
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