Bulletin of the United States Geological SurveyThe Survey., 1908 - Geology |
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Alaska alluvium August auriferous azurite basin beach bed rock belt bench gravels body bornite Bull Bulletin calcite cassiterite cents chalcocite chalcopyrite Chitina Chitistone limestone claims coal considerable Copper River cost country rock crosscut deposits depth developed dikes diorite ditch Drainage area dredge drift drill east elevation exposed Fairbanks district fault feet deep feet long Fortymile galena geologic Glacier gold granite greenstone ground gulch igneous inches intrusive Island July Kasaan Peninsula Kennicott Kennicott River Kotsina River Kougarok limestone localities located lode magnetite marble masses material metamorphic mineral resources mining Moffit Mountain mouth Nizina Nome occur open cut operations placer mining places porphyry portion present production prospecting pyrite quartz quartz veins region reported schist season Seward Peninsula shaft shales side southeastern Alaska square miles stream strike sulphides surface Survey thickness tributary tunnel U. S. Geol valley width Yukon zone
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Page iv - Alaska, 1907, by CW Wright. In Bulletin 345, 1908, pp. 78-97. 45 cents. The building stones and materials of southeastern Alaska, by CW Wright. In Bulletin 345, 1908, pp. 116-126. 45 cents. The Ketchikan and Wrangell mining districts, Alaska, by FE and CW Wright.
Page 128 - SCHRADER, FC, and SPENCER, AC The geology and mineral resources of a portion of the Copper River district, Alaska.
Page 127 - During the burning the carbon dioxide of the limestone is almost entirely driven off, and the lime combines...
Page iv - REPORTS. •The petroleum fields of the Pacific coast of Alaska, with an account of the Bering River coal deposits, by GC Martin. Bulletin 250, 1905, 64 pp.
Page 114 - A tunnel 50 feet in length and a shaft expose scattered masses of chalcopyrite, pyrrhotite, and pyrite in a gangue of garnet, epidote, and calcite, the deposit being 10 feet wide. This deposit is a replacement in limestone beds and many slipping planes denned by gouge seams traverse both ore body and country rock.
Page 120 - Bay, extending northward and overlying l>ods of conglomerate. Along the shore exposures and at the quarry small dikes of diabase, striking northeasterly and much altered and faulted, were observed intersecting the marble beds. Apparently these dikes antedate the metamorphism of the limestone and therefore the intrusion of the granite. They are, however, but a foot or two in width and not sufficiently numerous to affect the value or expense of quarrying the marble. In the present opening at the quarry...
Page 35 - For the 51,170 tons of the siliceous ores other than those from the Treadwell group, it was $4.58 per ton. A total of 105,729 tons of copper ores yielded an average of $0.94 per ton of gold and silver, and copper to the amount of 2.77 per cent. The copper percentage in Prince William Sound was estimated at 3.69. It may be noted from the tables that the content of silver in siliceous ores is less than 1 per cent of the value of the ore. The production of tin in Alaska since it was first mined in 1902...
Page v - No. 277, 1906, 80 pp. Preliminary statement on the Matanuska coal field, by GC Martin. In Bulletin No. 284, 1906, pp. 88-100. A reconnaissance of the Matanuska coal field, Alaska, in 1905, by GC Martin. Bulletin No. 289, 1906, 36 pp. (Out of stock; can be purchased of Superintendent of Documents for 25 cents.) Reconnaissance in the Matanuska and Talkeetna basins, by S. Paige and A. Knopf. In Bulletin No. 314, 1907, pp. 104-125. Geologic reconnaissance in the Matanuska and Talkeetna basins, Alaska,...
Page 236 - There are several veins at this place, but the middle one has been most extensively worked. At the present time the shaft is down more than 250 feet and several hundred feet of drift are turned off. The veins occur in a black, hard, somewhat graphitic, quartzitic rock which breaks into more or less rectangular fragments. This rock occurs in a rather narrow belt, a mile or so wide, extending from Uncle Sam Mountain to the head of Solomon River. The country rock is much fractured and is thoroughly...
Page iv - Special quadrangle; scale, 1: 62500; by WJ Peters. For sale at 5 cents each or $3 per hundred. Topographic map of the Juneau gold belt, Alaska. Contained in Bulletin 287, Plate XXXVI, 1906. Not issued separately. In preparation.