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Sinking methods and costs for a small vertical shaft with steel supports :Keystone mine, Crested Butte, Colorado

Published Year

• 1960-1969 (1)

Subject

• Lead mines and mining--Colorado--Gunnison County (1) *
• Shaft sinking (1) *
• Shaft sinking--Costs (1)

Author

• Bolmer, R. L. (1)

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