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Sinking a Large-Diameter Concrete-Lined Access Shaft: Harold D. Roberts Tunnel, Colorado

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

Published Year

• 1960-1969 (2) *

Subject

• Lead mines and mining--Colorado--Gunnison County (1)
• Shaft sinking (1)
• Shaft sinking--Costs (1)
• Shaft sinking. (1)
• Tunnels -- Colorado. (1)
• Water diversion -- Colorado. (1)
• Water-supply engineering -- Colorado. (1)

Author

• Bolmer, R. L. (2) *

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