Annual Report - Geological and Natural History Survey of Minnesota, Τόμοι 20-23Geological and Natural History Survey of Minnesota., 1893 |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
Animikie appears Archean argillyte augite bands beach beds biotite boulders character chlorite clastic cliff coarse color conglomerate crystalline crystals deposits diabase dike dioryte drift Duluth dyke east eruptive facies feet feldspar formation fragments gabbro Geol geological Geologist glacial gneiss grained granite granite porphyry gravel gray graywacke green schist greenstone hematite hills hornblende inches island Kawishiwi river Keewatin Kekequabic lake lake Superior lamination line of sec locality magnetite mass Mesabi range mica schist miles minerals Minn Minnesota moraine muscovado N. H. Winchell origin outcrops parallel pebbles porphyry portage Potsdam pyroxene pyroxene granite quartz quartzyte Rainy lake region Rept ridge rock S. W. sec schist schistose Schuchert sea-cliff sedimentary seen shows siliceous slate slope south shore specimens strata stream structure surface Survey syenite Taconic taconyte terrace thickness tion vertical
Δημοφιλή αποσπάσματα
Σελίδα 128 - Mr. Bostwick, Mr. Baxter and myself. A charter had been petitioned for and obtained, but owing to our ill success it was never taken from the seal-office.
Σελίδα 123 - He saw numerous evidences to convince him that this was an artificial excavation, and at a subsequent day, with the assistance of two or three men, proceeded to explore it. In clearing out the rubbish they found numerous stone hammers, showing plainly that they were the mining implements of a rude race. At the bottom of the excavation they found a vein with ragged projections of copper, which the ancient miners had not detached.
Σελίδα 126 - Last spring we bought of the savages a sheet of pure copper, two feet square, which weighed more than 100 pounds. We do not believe, however, that the mines are found on these islands, but that the copper was probably brought from Minong...
Σελίδα 136 - As we looked at the instrument, to our astonishment the north end of the needle was traversing a few degrees to the south of west. Mr. Burt called out, ' Boys, look around and see what you can find...
Σελίδα 134 - ... discovered. About a thousand permits were granted by the department, and nine hundred and sixty-one sites selected. Sixty leases for tracts three miles square, and one hundred and seventeen for tracts one mile square, were granted, and mining companies were organized under them. " Most of the tracts covered by these were taken at random, and without any explorations whatever ; indeed, a large portion of them were on rocks which do not contain any metalliferous veins at all, or in which the veins,...
Σελίδα 139 - Twin Falls" on the JlenoruineeJ, near S. 30, T. 40, R. 30, there is a large bed of specular iron ore associated with the talcose and argillaceous slates. It makes its appearance on the north side of a lake, and can be traced a mile and a half in length, and in places is exposed one hundred feet in width.
Σελίδα 140 - Anglais is of extraordinary thickness, — twenty-five to sixty feet. * * * In the wild and deep ravines where the Bad river breaks through the range, there is a cliff of slaty ore, most of which comes out in thin, oblique prisms, with well-defined angles and straight edges, probably three hundred feet thick, including what is covered by the talus or fallen portions. I estimate more than one-half of this face to be ore; and in places the beds are from ten to twelve feet in thickness, with very little...
Σελίδα 143 - Report of Explorations in the Mineral Regions of Minnesota during the years 1848, 1859 and 1864," published in Cleveland in I860.
Σελίδα 137 - It is a mountain of solid iron ore, 150 feet high. The ore looks as bright as a bar of iron just broken.
Σελίδα 125 - But further towards the west, on the same north shore, is the island most famous for copper, called Minong, (the good place,) Isle Royale. This island is twenty-five leagues in length; it is seven leagues from the main land and sixty from the head of the lake. Nearly all around the island, on the water's edge, pieces of copper are found mixed with pebbles, but especially on the side which is opposite the south, and principally in a certain bay which is near the northeast exposure to the great lake....