Bulletin of the United States Geological SurveyThe Survey., 1904 |
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9 페이지
... Nome , its most important mining camp , is the metropolis of Alaska . North of Seward Peninsula the Arctic Ocean stretches away toward the pole , while on the south Bering Sea , icebound for half the year , extends for 700 miles to the ...
... Nome , its most important mining camp , is the metropolis of Alaska . North of Seward Peninsula the Arctic Ocean stretches away toward the pole , while on the south Bering Sea , icebound for half the year , extends for 700 miles to the ...
10 페이지
... Nome very little was known regarding the York region . A mission had been established for a number of years at Cape Prince of Wales , where one of the Govern- ment reindeer herds was maintained . After the first rush to Nome prospectors ...
... Nome very little was known regarding the York region . A mission had been established for a number of years at Cape Prince of Wales , where one of the Govern- ment reindeer herds was maintained . After the first rush to Nome prospectors ...
14 페이지
... Nome and adjacent gold fields of Seward Peninsula , Alaska , in 1900 : Special report on Alaska , U. S. Geol . Survey 1901 , p . 133 . b Collier , A. J. , Reconnaissance of the northwestern portion of Seward Peninsula , Alaska : Prof ...
... Nome and adjacent gold fields of Seward Peninsula , Alaska , in 1900 : Special report on Alaska , U. S. Geol . Survey 1901 , p . 133 . b Collier , A. J. , Reconnaissance of the northwestern portion of Seward Peninsula , Alaska : Prof ...
20 페이지
... Nome or York . The nearest good anchorage is about 40 miles distant , on Port Clar- ence , from which there are several practicable railroad routes . A view of this mountain as seen from York , about 12 miles distant , is shown in Pl ...
... Nome or York . The nearest good anchorage is about 40 miles distant , on Port Clar- ence , from which there are several practicable railroad routes . A view of this mountain as seen from York , about 12 miles distant , is shown in Pl ...
26 페이지
... Nome late in the season of 1902 . ASSES EARS . Near the headwaters of the western tributaries of Pinnell River , in the region south of the eastern extension of Kotzebue Sound , are a number of small isolated areas of granite ...
... Nome late in the season of 1902 . ASSES EARS . Near the headwaters of the western tributaries of Pinnell River , in the region south of the eastern extension of Kotzebue Sound , are a number of small isolated areas of granite ...
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acid Alaska alluvial deposits Anikovik River Arctic Ocean assays Asses Ears associated average bed rock Bering Sea Brooks Mountain Buck Creek Buhner Creek Bulletin calcite Cape Mountain Cape Prince Cape York cassiterite Cassiterite Creek cent tin coal coast Collier concentrated consists copper Cornwall crystals dikes district Dolcoath Ear Mountain ECONOMIC GEOLOGY feet feldspar fluorite garnet gold granite gravels greisen inches intrusive ledge limestone locality lode Lopp Lagoon Lost River miles minerals mining Mint River Nome northwestern portion obtained occurrence of tin oxide Paper U. S. Geol places Port Clarence portion of Seward pounds Production of tin prospectors pyrite quartz reconnaissance reported Rolker sample schists Seward Peninsula slates sluice boxes smelting specimens stream tin sulphide Tin Creek tin deposits tin-bearing tourmaline traces of tin U. S. GEOLOGICAL SURVEY United States Geological veins wolframite writer York Mountains York Plateau York region
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56 페이지 - ROLKER, CM The production of tin in various parts of the world. In Sixteenth Ann. Rept., pt. 3, pp. 458-538. 1895. ULKE, T. Occurrence of tin ore in North Carolina and Virginia.
35 페이지 - Creek 2 to 3 feet of gravel overlies the bed rock, which consists of arenaceous schists, often graphitic, together with some graphitic slates. This is part of the schist series which has been described. The bed rock is much jointed, the schists being broken up into pencil-shaped fragments. They strike nearly at right angles to the course of the stream and offer natural riffles for the concentration of heavier material. A hasty reconnaissance of the drainage basin of this stream, which includes not...
47 페이지 - ... penetrated 140 feet vertically without reaching the bottom. In the mountains near its source the ore is angular and in comparatively large fragments, sometimes from an inch to a foot or more in diameter.
20 페이지 - The individual lesions appear as tense, clear, shiny vesicles, obtuse, round, or ovoid in form, and varying in size from that of a pin head to that of a pea.
36 페이지 - The determination of percentage by weight was as follows: 90 per cent tin-stone; 5 per cent magnetite; other minerals, 5 per cent. The cassiterite occurs in grains and pebbles, from those microscopic in size to those half an inch in diameter; they have subrounded and rounded forms. In some cases there is a suggestion of pyramidal and prismatic crystal forms. The cassiterite varies in color from a light brown to a lustrous black. A second locality of this mineral was found on the Anikovik River about...
45 페이지 - Maine a' cassiterite occurs at Winslow in small veins, which traverse impure limestone, with purple fluorite, mica, quartz, and mispickel. These veins have been prospected to a depth of 100 feet, but have yielded no tin in commercial quantities. Similar occurrences are reported at Paris and Hebron. In Massachusetts a few crystals of cassiterite have been found with albite and tourmaline at Goshen and Chesterfield. In Missouri* a small amount of cassiterite has been found replacing sphene in granite....
35 페이지 - In some cases, however, a little plagioclase was still unaltered and a suggestion of ophitic structure remained, so that these are probably of a diabasic character. The slates and schists are everywhere penetrated by small veins, consisting usually of quartz with some calcite, and frequently carrying pyrite and sometimes gold. These veins, are very irregular, often widening out to form blebs, and again contracting so as not to be easily traceable.
45 페이지 - Jackson in 1840 by Doctor Jackson. It occurs with arsenical and copper pyrites, fluorspar, and phosphate of iron in small quartz veins, and mica, slate, and granite near a trap dike. In South Dakota'' the Black Hills contain noteworthy deposits of tin ore, which, however, have not yet proved commercially productive. They occur in an area of coarse-grained granite in the central part of the hills. The Etta mine deposit, the only one that has produced any considerable quantity of tin, is a lenticular...