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| carbonate spars free from cobaltiferous ores, especially an 8-meter (25-ft.) vein at the diorite contact, worked...mica. The iron deposits of Dobschau still yield an annual production of about 35,000 tons, but the cobalt...' This Kupferschiefer is cases. lean in this district, carrying only 1.4% of copper, and no silver,...fissures known as 'rucken' in the Mansfeld copper district also contain occasional nickelite, together with... known examples of this type is the cobalt district of Schneeberg, in Saxony, a mountainous region |
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| Pe > J anes ai a - i; cata Safran , Fi rl an _ ae le 2 ns ae : a : ¥ oe a 7) | ie Soe al...communications to the Geological Society of America 419 West 117 Street, New York 27, N. Y. The Memoir Series...Newtoun Gland MO WeneGsesyaris Walbraconal roughinras an Cre en ta EEA re Pe ee reat mcr Ranctreatys Sse...Ker Cy Se de Pe eee ek Sa cee nN athe crite ea AN Pik 2 A caer erin ee ee eee COON aren ras oo Oe...ame iG a eer a Ree A ee ee NevadaiGity —'Grass: Valley) iter ore ae ee Shasta County a eee cere asses |
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| "ore-bearing zone" 1'ead "ore-bearing zone of the Knaben district," and transpose the paragraph with that following...somewhat similar to that of tungsten and vanadium. Hence an increased demand has sprung up for molybdenum ores...remark able properties, which are now manufactured on an exten sive scale. Owing to the shortage of tungsten...differs in yielding sulphur dioxide on heating in an open tube. The specific gravity is about 4·7. When...products derived from granitic magmas. There is also an important type of deposit in connection with crystalline |
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| MINING JOURNAL TRANSLATOR'S PREFACE. In presenting an English edition of Professor Beck's 'Lehre von den...the publishers to practically rewrite the book from an American standpoint, giving greater . prominence...advisable. For such additions and changes I alone am re- sponsible. , A slight abridgment of the...table of contents and index will, lar metal. am under deep obligation to Mr. Eobert Stein, of the...AUFLAGE Als die Vortrage iiber Lagerstattenlehre an der Kb'niglichen Bergakademie zu Freiberg mir iibertragen |
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| George Fast's mine, near La Trinidad, Sahuaripa district, Sonora, MexicoVII. Ends of radial plates of molybdenite...known molybdenum deposits of South America and the West Indies_____-______ 3. Principal known molybdenum...reviews uses, demand, and prices. An attempt is made in this paper to give an epitome of the world's larger...copper deposits, and wulfenite is in certain regions an oxidation product of lead veins. The minerals of...molybdate; erosite, a vanado-molybdate of lead; jordisite, an .amorphous sulphide of molybdenum: and pateraite |
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| Ore Deposits of the· Kokomo-Tenmile District, Colorado By M. H. BERGENDAHL and A. H. KOSCHMANN . I...Page PLATE 1. Geologic map of Kokomo-Tenmile district------------------------------------------------------...pocket FIGURE 1. Index map of Kokomo-Tenmile district ___________________________________________________________..._________________ _ 14. Map of Kokomo-Tenmile district showing areas of garnet and epidote alteration...Photomicrographs of polished sections from the Queen of the West and Gold Crest mines and from a prospect in Cresson |
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| DEPARTMENT OF THE INTERIOR Roy O. West, Secretary U. S. GEOLOGICAL SURVEY George Otis Smith, Director...________________________________________o 46 Fissure veins at an angle to the structure ____________________ 46 Veins...district_-_____-_-___-__ In pocket. 2. Geologic map of the Hyder district ____________________ In pocket. 3. Generalized...below an altitude of 3,000 feet, Salmon River Valley-----8 5. A, Mountains of Coast Range on west side...northwest of Hyder; B, View of valley of Salmon River____ 8 6. A, Valley of West Fork of Texas Creek below |
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| Published by Van Nostrand Reinhold Company Inc. L35 West 50th Street, New York, N.Y. 10020 Van Nostrand Reinhold...Data Pemberton, H. Earl, 1907Minerals of California. An updating of: Minerals of California: centennial volume...prepared as a report to the State Board of Agriculture an "Annotated Catalog of the Principal Mineral Species... • ID MOOOC PLATEAU I7 COAST RANGES 7 GREAT VALLEY :2f SIERRA NEVADA ~ BASIN RANGES Ell MOJAVE...dominant ma.fie mineral; adj. noritic. oxidized zone An area of mineral deposits modified by surface waters |
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| Norway BY M. G. OOSTEROM With 6 text-figures In 1953 an expedition, sponsored by Norges Geologiske Un dersøkelse...Prof. T. F. W. Barth, was sent to the coastal district of Vest-Finnmark. As a member of the team I spent...laboratory. To the director of the Survey, Mr. S. Føyn, I am grateful for the facilities so generously accorded...by Barth (2) and Krauskopf (6) have revealed that an explana tion of the origin of these interesting rocks...lenses). The lower slopes along the Lille Kufjord valley are heavily covered by talus, so only a few outcrops |
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| ^ '“ P r . . . I West Orange SOUTH SAN FRANCISCO PUBLIC LIBRARY 9048 00992838 7 257989 R q549...Published by Van Nostrand Reinhold Company Inc. 135 West 50th Street, New York, N.Y. 10020 Van Nostrand...Pemberton, H. Earl, 1907Minerals of California. An updating of: Minerals of California: 1866-1966 /...Berkeley, prepared as a report Board of Agriculture an “Annotated Catalog of the to the State Principal...CASCADE RANGE HI MODOC PLATEAU COAST RANGES S GREAT VALLEY SI SIERRA NEVADA 21 BASIN RANGES 3Zm MOJAVE DESERT |
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| description of the geology of the cupriferous pyrrhotite deposits of the Fontana and Hazel Creek mines...________________________________ Cupriferous pyrrhotite and pyrite deposits____________________________...Geologic map and sections of the Swain County copper district, North Carolina. 2. Geologic map of the Fontana...mines and districts of cupriferous pyrite and pyrrhotite deposits in the Southeastern States---------...chemical analyses of samples of gossan from some pyrrhotite and pyrite deposits in Alabama, Georgia, North |
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| MENDENHALL, Director CIRCULAR 10 THE McCOY MINING DISTRICT AND GOLD VEINS IN HORSE CANYON LANDER COUNTY...MENDENHALL, Director CIRCULAR 10 THE McCOY MINING DISTRICT AND GOLD VEINS IN HORSE CANYON LANDER COUNTY...1934 F'7V6 Contents Page The McCoy mining district Introduction Location and topography Geology Sedimentary...12 13 Illustrations Figure 1. View of McCoy district, showing mines, Fish Creek Mountains, and topography... 87266 The McCoy mining district, Lander County, Nevada By F. C. Schra,der . Introduction The following |
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| visions and additions make the Centennial volume an historical as well as a scientific record of California...from references to the geographic term ''Mining District," especially in the pre-1920 literature. Widespread...in the intensified prospecting for new localities. An instance of this is the detailed study of the borate...deposits of the Mojave Desert area and of Death Valley by a group of U.S. Geological Survey workers, with...primarily in the Boron area, but also in the Death Valley region. Another example is a recent study of the |
 | Symons, D. T. A., Lewchuk, M. T., Taylor, C. D., Harris, M. J. (2000) Age of the Sherman-Type Zn-Pb-Ag Deposits, Mosquito Range,Colorado. Economic Geology, 95 (7) 1489-1504 doi:10.2113/gsecongeo.95.7.1489 | Journal (article/letter/editorial) |
| been shown to be an effective way to directly date more than a dozen Mississippi Valley-type mineral deposits...application of this dating technique to Mississippi Valley-type Pb-Zn-Ba deposits have been summarized by...Permian as the ancestral Sawatch Range uplifted as an anticlinal core (De Voto, 1990; Landis and Tschauder...is also found the Sacramento Porphyry sill. It has an unknown thickness and has given a KAr biotite date...contain >60 percent sulfides of pyrite, marcasite, pyrrhotite, marmatite, chalcopyrite, galena, tetrahedrite |
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| publish a brief preliminary description of this district. Development work has not been very extensive... The deposit is located in the Plomosa mining district, Yuma County, Ariz., in the southern part of the...accessible station, and in an air line is just 28 miles a little north of west of Quartzite, the stage road...abruptly from the deserts. The Dome Rock Mountains have an average elevation of 1,500 feet, being approximately...branch of the mountains, one of its peaks rising to an elevation of over 2,700 feet. The dip of a These |
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| _________--____-_---_-------___-_--------_----_______ Ajo district.-_--_.____---------______--_-_--__---_______ Oatman...____________________________________________________ 11 Austria._____________________________________________________...______--__-__---_____----_____-__-___-___________ Bonanza district._________________________________________ Breckenridge...region___________________________________________ Spanish Peaks district.____________________________________ Summitville...________________________________________ Edwardsburg district._____________________________________ 11 11 12 |
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| Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...COLUMBIA Ice River complex. The Ice River complex is an intrusive body of alkaline igneous rocks where sodalite...ilmenite specimens have come from an unusual calcite vein-dike occurrence with an exposure very near, indeed...2008, when extensive blasting for construction of an extension to High,, ay 5 revealed veins of massive...(Weibel, 1980). The Maderanertal drainage flows west-southwest from a mountain massif to join the Reuss |
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| Species first discovered in California are marked by an asterisk (*), and followed by the date of the first...magmas to those of the surface waters, and constitute an important source of the less common, as well as of...Veins may be formed by waters travelling upward from an igneous source, or by solutions soaking down from...following authorities: Heizer and Treganza (1) who give an extensive bibliography, with a quite extensive list...interest that the San Francisco Call, in 1898 sent out an expedition conducted by Dr. Gustav Eisen of the California |
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| one sense it comprises the so-called Rockwood district and may be considered to extend as far southward...under present conditions. Beds dipping uniformly at an angle of 25° would reach a depth of 1,000 feet at...in the region. ~ In the following pages is given an outline of the main facts on which are based the...ROCKWOOD DISTRICT. i LOCATION AND EXTENT. The Rockwood district lies in the Tennessee River valley between...has been mined in many places along the west side of the valley between Spring City and Harriman, a distance |
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| Creek__________________________________________ Golden West Mining Co______________________________ Little Annie...sedimentary rocks of the Belt Series, which in this district are 40,000 feet thick. The Belt rocks here are...formations of the same name in the Coeur d'Alene district; the Ravalli is correlated with the Burke formation...Revett quartzite, and St. Regis formation of that district. In the southwest corner of the quadrangle is...these, the Dry Creek stock of quartz monzonite, has an area of 20 square miles. Certain of the metadiorite |
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| ............................... Seven Troughs district.................................................Outlook for the district................................................. Rosebud district................................................... Red Butte district........................................................................ Chafey and the Sierra district.......................................... Kennedy............................................... Pyrrhotite............................................. |
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| Geology and ore deposits of the Shafter mining district, Presidio County, Tex., by Clyde P. Ross _______...Pre-Pennsylvanian rocks crop out nearby, to the west. Mesozoic sedimentary rocks the Morrison formation...sively fractured porphyry or other brittle rock. An early stage of mineralization caused widespread deposition...Platte Valley and of the lower part of Beaver Creek came from mineralized areas of the Alma district, west...large increase in gold production from the Alma district has greatly stimulated interest in territory immediately |
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| Continued. Page. Grants Pass quadrangle and Medford district........................ 39 Braden mine......................................... 88 Cottonwood district, California................................................................ 90 Geology of the district......................................... 91 The...Wolf Creek district..........................:................. 104 Grave Creek district...............Jumpoff Joe district................................ 7 ........... 105 Evans Creek district........... |
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| amounting to 1,460,967 tons in 1949 as compared to an average of 583,000 tons in the years 1935 to 1939...subject was large and involved and time was short. As an alternate form of guide, this annotated bibliography...bibliography on domestic sulfur and pyrites deposits and an index map to these deposits were prepared. 2. Fyrrhotite...pyrites deposits (including pyrite, marcasite, or pyrrhotite deposits, that commonly contain some copper and...decide whether a certain metalliferous deposit or district should be included or not. The problem was also |
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| Professional Paper 194 THE GOLD QUARTZ VEINS . OF GRASS VALLEY, CALIFORNIA BY W. D. JOHNSTON, JR. UNITED STATES...character ________________________ _ Magnetite-pyrrhotite vein _______ .,:.. _____________ _ Gold quartz...16 16 16 16 17 17 18 18 18 18 18 19 19 21 21 Pyrrhotite _ _ ~ -----------------------------Quartz _____________...treatment_______________________________ Veins on the west side of the granodiorite area_____ Gold Hill, Massachusetts...71 72 72 72 72 73 Mines-Continued. Veins on the west side of the granodiorite area-Con. North Star mine-Continued |
