Economic Geology of the Bingham Mining District, UtahU.S. Government Printing Office, 1905 - 413 Seiten |
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adjacent alteration appears areas assays bands barren beds Bingham Canyon black sulphide bodies breccias Butterfield Canyon calcareous calcite carbonate Carboniferous Carr Fork cent chalcocite chalcopyrite chert Commercial limestone Copper Center country rock crosscut crystalline crystals deposition depth dikes district east east-west extensive fault feet fissures foot wall formation fracture zone galena gold grains granular gravels hanging wall Highland Boy igneous rock incline inclosing intrusives irregular Jordan limestone laccolith Last Chance lode lower marble mass massive metallic mineral mines monzonite northeast northeast-southwest northwest occur Old Jordan Oquirrh ore-bearing ounces outcrop oxidized pay streaks planes porphyry portion probably pyrite quartz quartzite replacement reported secondary semicrystalline shale shoots siliceous silicification sill Silver Shield slope southwest specimen sphalerite stope strike structure surface Telegraph tetrahedrite thickness trend tunnel U. S. GEOLOGICAL SURVEY underground Upper Bingham Utah values vein vertical West Mountain Winamuck zinc
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Seite 101 - TERHUNE, RH Ore and matte roasting in Utah: Trans. Am. Inst. Min. Eng., vol. 16, pp. 18-24. TOWER, GW See SMITH, GO TRIBUNE, The Daily, Salt Lake City, Utah, January 1, 1900. Presents annual review of progress in mining in Biugham, including developments in individual properties.
Seite 172 - ... intrusives. The brilliant tarnish of grains of chalcopyrite indicates a beginning of alteration, and thin rims of a dark grayishblack metal about chalcopyrite observed under the microscope suggest continuance of that process and replacement by black copper sulphide.
Seite 186 - The theory of the substitution of ore for rock is to be accepted only when there is definite evidence of pseudomorphic, molecular replacement.
Seite 165 - ... the possible instances of the deposition of pyrite and chalcopyrite by magmatic differentiation. Disseminated copper ore in igneous rock. — The occurrence of disseminated ore in igneous rock in Bingham which is most thoroughly known, and which thus affords the most favorable opportunity for study, is in the intrusive body at Upper Bingham, known as the Bingham laccolith. This irregular mass has been extensively explored by tunnels, test pits, borings, and shafts, and thoroughly sampled throughout....
Seite 123 - The sedimentary section exposed in this district embraces several thousand feet of massive quartzite, thin, intercalated limestones, and calcareous shales. Though the calcareous members form a very small portion of this total thickness, their influence in the deposition of ore bodies gives them special importance. This great quartzite section may thus be broadly divided on lithologic grounds into two parts — a lower, which is distinguished by a few comparatively thin interbedded limestones, and...
Seite 185 - As was stated in the description of the structure of the copper shoots (p. 155), the broad characteristic of this structure is banding. This banding is not like the crustified or even the roughly banded structure of the lodes, but is a bedding which in form is identical with the bedding of strata. The chief difference is in composition, these beds being composed of ore instead of limestone or quartzite. Bedded structure characterizes alike miniature ore bodies, mineralized wall rock adjacent to seams,...
Seite 227 - ... which traverse the pyrite. In slides of cupriferous pyrite taken in the overlying zone of transition from sulphides to oxides this alteration is seen to be further advanced. The brown alteration product fringes grains of sulphide, extends into the sulphides in bands of considerable width, incloses it in isolated areas, and, excepting included bits of sulphides, entirely fills fracture zones in the sulphides. This appears seal-brown in color, translucent and opaque in transmitted light, and a...
Seite 229 - Heated aqueous solutions from the deeper unconsolidated portions of the magma then ascended these channels, altered their walls, and introduced additional metallic elements. At this time more pyritous copper sulphide may have been added to that formed earlier in the limestone in connection with contact metamorphism.