Development Of Three-Wing Bits In The Tri-State District
- Organization:
- The American Institute of Mining, Metallurgical, and Petroleum Engineers
- Pages:
- 5
- File Size:
- 601 KB
- Publication Date:
- Jan 1, 1942
Abstract
THE opening of zinc-lead ore bodies in the lower chert beds of the Tri-State district, locally called sheet-ground deposits, [ ] presented several new economic operating problems to be solved before the low-grade deposits could be mined profitably. Drilling was the first high-cost problem and loading and haulage difficulties followed. At this time, the sheet-ground mines are producing about 2000 tons per day. GEOLOGY The geology and ore deposits of the Tri-State district have been covered in detail by [ ] Fowler and Lyden.* Briefly, the sheet-
Citation
APA: (1942) Development Of Three-Wing Bits In The Tri-State District
MLA: Development Of Three-Wing Bits In The Tri-State District. The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1942.