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Ventilating methods and safety measures used in the temporary ventilation of the King Solomon tunnel, Frisco, Summit County, Colo.

Raising with a suspended work cage at the Irene Shaft, Leadville, Colo.

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

Published Year

• 1950-1959 (2)
• 1960-1969 (1)

Subject

• Abandoned mines--Colorado (1)
• Lead mines and mining--Colorado--Gunnison County (1)
• Mine hoisting (1)
• Mine ventilation (1)
• Mining engineering (1)
• Shaft sinking (1)
• Shaft sinking--Costs (1)
• Tunnels--Colorado (1)

Author

• Bolmer, R. L. (3) *
• Fritts, G. B. (1)
• Greenlee, B. B. (1)

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