Hewlett, Richard F.
Comparison of the triangular, polygonal, and a statistical method of computing grade and tonnage of ore for the Silver Bell Oxide porphyry copper deposit Richard F. Hewlett - Washington Bureau of Mines 1970 - ii, 33 p. il., maps 26 cm - RI 7331 .
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.
copper ores
classification
grading
552
Comparison of the triangular, polygonal, and a statistical method of computing grade and tonnage of ore for the Silver Bell Oxide porphyry copper deposit Richard F. Hewlett - Washington Bureau of Mines 1970 - ii, 33 p. il., maps 26 cm - RI 7331 .
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.
copper ores
classification
grading
552