Both compressed air and trolley electric locomotives are used; haulage track 30 in. gage, with 40 and 60 lb rail; frogs are solid manganese steel; ties 6 by 8 in. by 5 ft 2 in. sawed Oregon fir; 6 shafts and 3 tunnels; shaft dimensions; skip loading stations; electric hoisting practice.
Haulage and hoisting at mines of inspiration consolidated copper co
Min Congress J
Mining Congress Journal ; 20 , n 2
1934
2 pages
Article (Journal)
English
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