Design of drill-hole grid spacings for evaluating low-grade copper deposits
By: by Richard F. Hewlett.
Contributors: United States. Bureau of Mines.; Bear Creek Mining Company.; University of Arizona. State Bureau of Mines.; University of Arizona. College of Mines.
Series: Report of investigations -- 6634; Report of investigations (University of Texas. Bureau of Economic Geology)
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1965
Place of publication: [Washington, D.C.]
Language: eng
Number of pages: 46
Subjects: Copper ores.; Copper mines and mining.; Boring.
Notes: Performed in cooperation wth the Bear Creek Mining Co., and the Bureau of Mines and the College of Mines, University of Arizona.

Includes bibliographical references.