 | | Report (issue) | | Mahnomen No. 4 mine__--______------_. Sultana-Hopkins mine___________________ Louise mines.___________-______---_--_...mine_________________________ Sagamore mine and the Syracuse property. Selected references-_________________________...mines area showing geologic contacts previous to mining and positions of sections on plate 8. 8. Isometric...flows or sills and probably also beds of water-laid tuff. Thin horizontal Keweenawan flows have been reported...abruptly by an influx of clay and silt and, locally, tuff and flows into the sedimentary basin. The bottom |  | | Report (volume) | | mechanization minerals a.re indeed the sinews of war. The British have shown that vulor can offset, to a remarkable...Tallahassee, Fla.; Garland Peyton, director, division of mines, mining, and geology, department of natural rnsources...Voskuil, mineral economist, State geological survey division, Urbann, Ill.; A. 0. Trowbridge, director, Iowa...Clrnrlottesville, Va.; Harold E. Culver, supervisor, division of geology, department of conservation and development...- - - - . - .. - _ - .. Carbon black, by G. R. Hopkins and H. Backus •... __ . ,. _ _ . _ .... ., Cement |  | | Report (issue) | | '" ..... .......... ..... .... .... ....... 154 Hopkins mine......................................... 156...based largely on the results of exploration and mining work. Many drill cores and records of diamond drilling...largely on the generosity of the exploration and mining companies in furnishing information and in allowing...of Lake Superior from Duluth northeasterly into Canada, and a smaller area along the upper St. Croix River...crystalline phases, such as diabase, and with beds of tuff and volcanic brecciaY Thin layers of conglomerate |
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