Minnesota Granite Poses Tough Drilling Problem
- Organization:
- The American Institute of Mining, Metallurgical, and Petroleum Engineers
- Pages:
- 1
- File Size:
- 121 KB
- Publication Date:
- Jan 9, 1950
Abstract
One of the operations of the J. L. Shiely Co. is quarrying in a hard granite gneiss with intrusions of gabbro or trap. During the winter of 1948-1949 the quarry ramp was lowered about 30 ft and during the 1949 season practically all drilling was done from the quarry floor, developing a face from 72 to 83 ft for the entire quarry area. The performance and cost table shows our record for 1948 and 1949.
Citation
APA: (1950) Minnesota Granite Poses Tough Drilling Problem
MLA: Minnesota Granite Poses Tough Drilling Problem. The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1950.