Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mining practices, methods, and costs at mine no. 5 of the Marquette range, Michigan
Soft hematite orebody in ferruginous cherts and slates intruded by diorite; bessemer and non-bessemer ore produced; development and mining methods; top-slicing system used; underground costs $1.095 per ton hoisted.
Mining practices, methods, and costs at mine no. 5 of the Marquette range, Michigan
Soft hematite orebody in ferruginous cherts and slates intruded by diorite; bessemer and non-bessemer ore produced; development and mining methods; top-slicing system used; underground costs $1.095 per ton hoisted.
Mining practices, methods, and costs at mine no. 5 of the Marquette range, Michigan
U. S. Bur. Mines -- Information Cir
Graff, W.W. (Autor:in)
1930
10 pages
5 Figs. on supp. plates
Report
Englisch
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