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Blast-hole diamond drilling in California mines by Butner, D. W. is a nonfiction available to read on EtoBox.

What is Blast-hole diamond drilling in California mines about?

The blast-hole method for drilling and breaking ground is not new to the mining industry. For several years it has been used rather extensively in Canada, particularly in the gold mines, where it was first developed and where the major advances in the technique as applied to present-day mining problems have been made. At present, 40 mines in Canada and the United States are using the method in one form or another, and from all indications its use will increase in the future. In two California mines, blast-hole diamond drilling is now used for a part of or for all stoping operations, and in one of these it is used to some extent in development work. At the Mountain Copper Co.'s Hornet mine in Shasta County, about 50 percent of the pyritic sulfide ore produced is mined by the blast-hole method, and the U.S. Vandaium Corp. mines 8- percent of the ore produced at its Pine Creek Tungsten mine in Inyo County by this method. At Pine Creek, long-hole drilling and blasting is used for mining pillars also, and in pre-stopping development. The blast-hole diamond-drilling method is not applicable to all types of ore bodies. A third property in California, the El Dorado Limestone Company, El Do

Who reads Blast-hole diamond drilling in California mines?

Author

Butner, D. W.

Publisher

U.S. Dept. of the Interior, Bureau of Mines, 1948.

Published

1948

Language

EN

Category

nonfiction