This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...Peak. (See complete analysis given on page 32.) 188. Fresh diorite, locality near that of 185. (See complete analysis given on page 32.) 195. Diorite from knob at 10,500 elevation, about one-half mile north of Bridger Peak. 210. Fresh diorite from new adit, Ferris-Haggertv. Contains mere traces of copper, nickel, and ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...Peak. (See complete analysis given on page 32.) 188. Fresh diorite, locality near that of 185. (See complete analysis given on page 32.) 195. Diorite from knob at 10,500 elevation, about one-half mile north of Bridger Peak. 210. Fresh diorite from new adit, Ferris-Haggertv. Contains mere traces of copper, nickel, and cobalt. (" For the definition of the rocks which are called diorites in this list, see page 30. 2100--No. 25--04 4 SIS. Fresh norite from Octavia tunnel. 290. Decomposed diorite, lover tunnel of Ferris-Haggarty mine. 253. Fresh diorite, from cutting on wagon road about 1 mile north of Bachelor's cabin in head of Big Sandstone Creek. (See complete analysis given on page 32.) 352. Serpentine collected below the canyon of Big Sandstone Creek. In none of the rocks tested was it possible to recognize the presence of metallic minerals other than magnetite by microscopic examination, so that the metals may either enter into the composition of the silicates of the rock or may occur as sulphides included mechanical in the silicate minerals. If the tests had shown the presence of copper only in the metamorphosed phases of the igneous rock, it might be argued that the metal had been introduced during alteration, but since both it and the nickel and cobalt are also found in entirely fresh, unaltered norite, the fact that they were all present in the rock while it was still in a molten condition and when it was intruded may be accepted without serious doubt. Copper seems to have been universally present in the magma while nickel and cobalt occur onty in the more basic phases. Traces of chromium were detected in four samples tested for that element. The gabbro rock is a sufficient and probable souree for the copper occurring in most of the observed ore ...
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