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Mahr tunnel encounters 20,000-G.P.M. flow
Note on drainage tunnel of Cerro de Pasco Copper Corp at Morococha, Peru; illustrations and brief text describing condition at about 23, 183 ft from portal.
Mahr tunnel encounters 20,000-G.P.M. flow
Note on drainage tunnel of Cerro de Pasco Copper Corp at Morococha, Peru; illustrations and brief text describing condition at about 23, 183 ft from portal.
Mahr tunnel encounters 20,000-G.P.M. flow
Eng Min J
1933
5 pages
Aufsatz (Zeitschrift)
Englisch
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Driving a 20,000 sec. ft. flood protection tunnel
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