Guidebook, Masalah 23U.S. Government Printing Office, 1932 |
Edisi yang lain - Lihat semua
Istilah dan frasa umum
_do____ abundant altered granite Anaconda and Blue Anaconda Hill Anaconda system Anaconda vein andesite aplite Blue system Blue vein system bodies Boulder batholith Butte district BUTTE MINING DISTRICT Butte veins central copper zone chalcocite and bornite chalcopyrite colusite commonly Continental fault copper and zinc copper area copper minerals copper veins Covellite cut-offs deposits depth displacement Econ enargite fault fissures feet 1,219 meters feet 30 fractures galena gangue Geology Gidel gold grams granite wall rock horsetail Hübnerite hypogene Inst intermediate zone leaching lead-zinc levels manganese minerals ment microscope Middle fault miles 3.2 kilometers minerals form mines at Butte Montana northeast faulting occur older vein ounces paragenesis peripheral area peripheral zone porphyry pyrite quantities quartz monzonite Rainbow lode Rarus fault replacement rhodochrosite rhodonite rhyolite Sales 20 sericite shafts shoots sphalerite stopes strike structure supergene surface tennantite tetrahedrite Trans veinlets View breccia vugs zinc zonal arrangement
Bagian yang populer
Halaman 3 - States governing their possessory title, shall have the exclusive right of possession and enjoyment of all the surface included within the lines of their locations, and of all veins, lodes, and ledges throughout their entire depth, the top or apex of which lies inside of such surface lines extended downward vertically, although such veins, lodes, or ledges may so far depart from a perpendicular in their course downward as to extend outside the vertical side lines of such surface locations.
Halaman 25 - SALES, RH, The localization of values in ore bodies and the occurrence of shoots in metalliferous deposits; ore shoots at Butte, Montana: Econ.
Halaman 7 - Sales (20, p. 13) describes this system as "remarkably continuous complex fractures of but slight displacement with little or no crushing of the wall rock, varying greatly in strike and dip and exhibiting at times a tendency to develop highly fissured areas in which there may be found a multiplicity of transverse fractures more or less at right angles to the general direction or strike of the main fracture planes. * * * As veins they are in general uniformly and continuously mineralized." Ascending...
Halaman 13 - A'-A', the manganese minerals rhodonite and rhodochrosite are of frequent occurrence. 3. An outer or peripheral zone of undetermined width bordering the intermediate zone, in which copper has not been found in commercial quantities. The vein filling is chiefly quartz, rhodonite, sphalerite, pyrite, and rhodochrosite.
Halaman 25 - The localization of values in ore bodies and the occurrence of shoots in metalliferous deposits; ore shoots at Butte, Montana: Econ. Geology, vol. 3, pp. 326-331, 1908; Eng. and Min. Jour., vol. 86, pp. 226-227, 1908. 19. SALES, RH, Superficial alteration of the Butte veins: Econ. Geology, vol. 5, pp. 15-21, 1910. 20. SALES, RH, Ore deposits at Butte, Montana: Am.
Halaman 14 - ... relatively much less quantities than in the other two zones. Quartz is the most abundant gangue mineral. * * * Galena is present in considerable quantities* * * Extending outward from the peripheral zone the fissures appear to become less mineralized, sulphides largely disappearing, the vein filling consisting principally of quartz with scattered pyrite, and curiously enough arsenopyrite has been noted at extreme distances 2 miles [3.2 kilometers] or more from the central copper zone. It should...
Halaman 13 - ... along the strike of 1,000 feet [305 meters]. * * * The manganese minerals rhodonite and rhodochrosite begin to appear in small quantities toward the borders of the intermediate zone and increase perceptibly toward its outer" limits. * * * The silver content increases materially. * * * The net result is a decrease in copper content with an increase in silver, zinc, lead, and manganese; quartz as a gangue does not vary, but pyrite is less abundant toward the outside limits. 3. An outer or peripheral...
Halaman 13 - ... follows : 1. A main or central copper zone occupying largely the great area of altered granite in the vicinity of the Mountain View mine, in which the ores are characteristically free from sphalerite and manganese minerals. This zone is represented by the shaded area in Fig. 7. 2. An indeterminate zone of irregular width nearly surrounding the central copper zone, in which the ores are predominantly copper, but are seldom free from the mineral sphalerite, and near the outward boundaries, AAA...
Halaman 14 - ... peripheral zone the fissures appear to become less mineralized, sulphides largely disappearing, the vein filling consisting principally of quartz with scattered pyrite, and curiously enough arsenopyrite has been noted at extreme distances 2 miles [3.2 kilometers] or more from the central copper zone. It should be kept in mind that the dividing lines between these three zones are -of an arbitrary nature; the passing of one zone into another is gradual and can not be correctly represented by a...