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Shaft sinking by rotary drilling

Sampling deep ore deposits by rotary drilling and methods of surveying and controlling the direction of drill holes

Published Year

• 1940-1949 (1)
• 1950-1959 (1)

Subject

• Rotary drilling (2) *
• Shaft sinking (1)

Author

• Johnson, A. C. (1)
• Platt, D. H. (1)
• Trengove, Russell R. (1)

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