Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Famous five-mile newhouse tunnel now draining many Colorado mines
Brief article describing some details of development work in connecting workings of Phoenix Burroughs mine with drainage tunnel; bottom of old shaft tapped by 57-ft. diamond drill hole from raise above tunnel. From Boulder Miner.
Famous five-mile newhouse tunnel now draining many Colorado mines
Brief article describing some details of development work in connecting workings of Phoenix Burroughs mine with drainage tunnel; bottom of old shaft tapped by 57-ft. diamond drill hole from raise above tunnel. From Boulder Miner.
Famous five-mile newhouse tunnel now draining many Colorado mines
Min. Rev
Mining Review ; 30
1928
Aufsatz (Zeitschrift)
Englisch
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