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| Washington, DC 20013 pohwatp@si.edu WILLEMITE Tsumeb Mine, Tsumeb, Otjikoto, Namibia M ineral nomenclature...20 June 2015 Figure 1. Willemite from the Tsumeb mine, Otijikoto region, Namibia. The specimen displays...Black willemite is common from the Sterling Hill mine, with the color due to inclusions of franklinite...major willemite specimen producer is the Tsumeb mine, Tsumeb, Otjikoto region, Namibia. Willemite specimens... Other associated minerals include plancheite, quartz, malachite, calcite, and mimetite. Pseudomorphs |
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| The oldest known formation in the area is the Excelsior Shale of lower Paleozoic age, over which lie two...the north to Suitucancha,south of Carahuacra. The quartz monzonite intrusive of Carahuacra is consideredto...formed silver rich zones in the northern part of the mine that were protected from the early Tertiary glaciation............................ Geology of Carahuacra Mine ................... 251 253 253 The breccia zone.......................... 253 Drag folds in the mine area .................. 254 The ore zones ... |
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| ........................................ 598 Excelsior series..........................................LAUGHLIN---- THE PERUVIAN CORDILLERA Page Cerro quartz-monzonite porphyry...............................bio basalt Tlows and sills C o n d o rs in g a Potosí limestone Montero basalt ?u eara (Chulec member)...A M B R lA N Í? ) M itu formation Excelsior se rie s Excelsior series 2 5 0 0 ft (pf. est.) ml...ncss ANO A B S R E V IA T IO M G cn er a l Excelsior series ( Y a u li ) 2500ft. (estimated) Yauli |
 | | Book (edition) |
| example for such a situations can be seen in euhedral quartz crystals embedded in the sulfide matrix of fossil...normally contain amorphous silica/opal rather than quartz in its initial stages, as is the case in modern...displaying various colours under XPL; euhedral quartz shows milky internal reflections. Internal Reflections...Late proustite (red internal reflections) filling quartz druse (milky); dike filling. Right (third from...(often 120º). Right (top): Recrystallised euhedral quartz (dark grey) in pyrite (creme) and chalcopyrite |
 | | Journal (article/letter/editorial) |
| monzoniteand volcanicagglomerateto sericite-pyrite-quartz. Upward and outward zoning relative to central...centrallylocatedpyrrhotitepipesfollowsthe sequence quartz-pyrrhotite-wolframite, pyrrhotite-stannite-chalcopyrite-sphalerite...have been buffered by pyrrhotite-siderite-chlorite-quartz toward increasingoxidation-sulfidationstates, such...may signify brief excursions into the quartz-sideriteor quartz-chloritefieldsdue to influx of oxidized...locatednear the contact of the vent with the pyrite-quartz body, represent a second stage of ore deposition |
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| _______________ _ Mine descriptions _________________________________________________ _ ~1achcan mine ________...__________ _ Mine workings ____________________________________________ _ -:\lilpo mine ____________...Atacoeha mine area. Map of the 4,103 level, Atacocha mine. Map of the 4,000 level, Atachocha mine. Map of...of the 3,900 level, Atacocha mine. Geologic map of the Milpo area. Page Index map showing location of...Cretaceous rocks overlie the limestone and consist of quartz sandstone overlain by basalt flows. Cretaceous |
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| complexenterprise,includingthe Goyllarisquizga coal mine, concentrating, smelting,and refiningfacilitiesand...Triassic-Jurassic Pucargor Paria Permian Mitu Lower Excelsior Paleozoic & Catalina Series Locally,and toward...and Copacabanaformationsare preservedbetweenthe Excelsior and the Mitu. Thicknessof individualformationsvary...shale limestone, shale Ambo sandstone,shale Excelsior shale, phyllite Belt. Subsid- iary basin in...40 FORMATIONEVENTS 2 400 • z m - - • • EXCELSIOR • • •z• •o 414 ULRICH PETERSEN Their total |
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| during the field recognized to the east. The Excelsior group is a work and presented to the American...close folding. No fossils are known from the Excelsior group, but it is tentatively conPREVIOUS WORK...limestones and dolomites at least 4000 feet thick. Excelsior group is a persistent but extremely Paleontological...whole, thick, remaining seof quartzDownloaded and Excelsior-type argillaceous maquence of limestones is not...April 29, 1947) has sandstone, and interbedded quartz conglomer- found the brachiopod genus Spondylospira |
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| THE PYRITE CERRO BODY AND COPPER DE PASCO MINE, HECTOR OREBODIES CENTRAL PERU J. WARD CONTENTS................................. Veins in the Excelsior Formation ................................ ...ABSTRACT The general geology of the Cerro de Pasco Mine in Central Peru is briefly reviewed to acquaint...one of which could, in itself, have constituteda mine. This contributionto the geologyof Cerro de Pasco...GEOLOGY The generalgeologyof the environsof the mine is reviewedto acquaint the reader with the settingof |
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| .......................... Alteration of the Excelsior Rocks ...................... Z(mal Distribution...magmaof quartzmonzonite exploded a ventthrough the Excelsior rocks so close to the fault that at the level...largelyof fragmentsof Excelsiorrocksandof comminuted quartz-monzonite porphyry;an intrusivebreccia (locallycalledthe...(locallycalledthe Lourdesfragmental),consisting of Excelsior .fragmentsin a dominantmatrix of (mainly) non-brecciated...irregular intrusivemassand numerousdikes of normal quartz-monzoniteporphyry. Beyond doubt, the volcano which |
 | | Report (volume) |
| Triassic rocks._________.___________________ Excelsior formation. .. ... __........_................_...Co. mine . ___.........__......_.... Lost Steers mine _.._-_ -__ __..__ .____.__..._.... Drew mine.__...Mammoth mine._.._._ _.._...__.__ _.._._.__.... Hitt mine.....__..____ . _____.____. Alien mine __... ...Cardinal mine________________________.________ Inman mine - . . . _.____ _._ Betty mine__________ ._________...underground workings of the Mina ?^ Development Co. mine, Pilot Mountains district ._Ll.. In pocket .V.. |
 | | Journal (article/letter/editorial) |
| UpperCretaceous to theOligocene(M(•gard, the pre-Pucar•t Excelsior phyllites and Mitu sand1984). The magmaticact...deposited.Lead For the strata-boundoreshostedby the Excelsior Group,Kobe(1982) proposeda syngenetic emplacement...nsesof Pb-Zn-FeandNi-Co-Cu-(Fe-Mn)oresin the Excelsior Group(i.e., Ultimatummine;Kobe,1984), (3) veins...PucarS. limestones,Goyllarisquizga sandstones, and quartz monzonite intrusions,as well as interca- late...crustalfluidsby San Crist6bal,includingthe Main vein of this mine magmaticeventseitherby heatingor by laterhydroandAndaychagua) |
 | Baumgartner, R., Fontbote, L., Spikings, R., Ovtcharova, M., Schaltegger, U., Schneider, J., Page, L., Gutjahr, M. (2009) Bracketing the Age of Magmatic-Hydrothermal Activity at the Cerro de Pasco Epithermal Polymetallic Deposit, Central Peru: A U-Pb and 40Ar/39Ar Study. Economic Geology, 104 (4) 479-504 doi:10.2113/gsecongeo.104.4.479 | Journal (article/letter/editorial) |
| diatreme, 15.35 ± 0.05 and 15.16 ± 0.04 Ma for two quartz monzonite porphyry dikes emplaced into the diatreme-dome...the first mineralization stage, bracketed by the quartz monzonite dikes (15.1 Ma) and the second mineralization...of sericite in the alteration halo of the pyrite-quartz body are not reliable, probably due to inherited...de Pasco N-8820000 (10°40' S) A A’ Chile Bolivia Yanamate MINERALIZATION TYPE Cu-Zn-Pb-(Ag-Au-Bi)...(Permian-Triasssic), sandstones Thrust and reverse faults Excelsior Group (Devonian), phyllites Fold axis D A' A |
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| ShuCOLimestone Conglomerote Pucoro Group Mitu Group Excelsior Group Thrus| fault Fold axes 0 1 Fig. 2. Geologicmap...quartzites of the Devonian Excelsior Formation. The large area of Excelsior Formation west of the city...Triassic-Jurassic Pucarfi limestone over the Excelsior and the Tertiary Pocobamba Formation (Fig. 2)...and volcanic complex, the "Vent", intrudes the Excelsior Formation along the west side of the body of massive...dates of 14 to 15 Ma (Silberman and Noble 1977). Mine geology On the eastern side of the McCune pit the |
 | | Report (chapter) |
| va Ne Excelsior-Coaldale Block Camp Douglas Goldfield Goldfield Block Spotted Range/ Mine Mt. Block...systems, the veins being typified by tabular, banded quartz and adularia, or tabular Downloaded from http://sp...450 B. R. BERGER siliceous masses consisting of quartz –alunite– kaolinite + pyrophyllite alteration....Virginia City andesitic volcanism, adularia-bearing quartz veins (15.49 + 0.04 Ma, Castor et al. 2005) formed...associated extension could not be older than the stock. Quartz – alunite masses in the footwall of the Comstock |
 | | Book (edition) |
| Metal : Oxygen = 1:2 (MO2 and related compounds) Quartz IV/D.01-10 Silica, amorphous IV/D.01-80 Rutile...Reflections: Reflectance [%]: Anisotropy: Pleochroism: quartz veins, alluvial deposits gold-yellow, silver-white...Anhedral electrum (yellowish white), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic....white), argentite (greenish grey), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic....goethite (bluish grey shades), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. |
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| (Middle Triassic) ______-___________--_-__-_--Excelsior formation (Middle Triassic)__ Luning formation...______ Rocks exposed. ____________^____________ Excelsior formation. _ _________________ Luning formati... Rocks exposed__-_______________.-__________ Excelsior formation. _ ___________________ Luning formation...Continued Mcsozoic rocks______________________ Excelsior formation(?)________ Luning formation____________...____________________ Rocks exposed____________-.--._-___. Excelsior formation ______________ Dunlap formation.___________ |
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| University Auburn, Alabama 36849-5305 COPPER RAY MINE, PINAL COUNTY, ARIZONA Downloaded by [University...shaft, arborescent groups from the Copper Queen mine, and even postmining growths on old timbers in the...include the New Cornelia pit, Pima County, and the Ray mine in Pinal County. Masses and sheets of crystalline...sometimes of large size, have been found in the Chino mine, Santa Rita, Grant County, New Mexico. Fine specimens...azurite crystals have been collected at the Rose mine, also in Grant County. Elsewhere in New Mexico, |
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| Julcanivolcaniccenter,centralPeru.The dikes,which predatelater quartz-alunite-pyriteand argillic alterationstagesand...breccia.Thegreaterresistanceof the dikesrefectsthe quartz-tourmaline-pyrite alteration, which is restricted...district geologists, derived fromthelowerPaleozoic Excelsior Formation. Suchfragments areabundant bothonthe...Thefragmental dikesatJulcaniconsist primarilyof Excelsior Formation. very finegrainedbrecciathat appearsto...15 cmwidetypicallyaregraded,possessinglargelyof quartz,tourmaline,and pyrite (Fig. 7). fine-grained margins |
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| stages. The first stage consists of a large pyrite-quartz body replacing Lower Mesozoic Pucará carbonate...composed of pyrite with pyrrhotite inclusions, quartz, and black and red chalcedony (containing hypogene...contact with the pyrite-quartz body, the diatreme breccia is altered to pyrite-quartz-sericite-pyrite. This...alteration assemblage quartz-muscovite-pyrite associated with the pyrite-quartz body suggests that the...However, the presence in the pyrite-quartz body of hematite within quartz suggests that, locally, the fluids |
 | | Book |
| Each one is followed with information regarding the mine and other smaller ones near by, along with any older...GUNNISLAKE CUTTERS MINE SX 47 421720 1830 GR.At-J ITE + + + + a.bove + + A copper & tin mine. (situated...from 276 fathoms 3 OLD GUNNISLAKE MINE SX 47 431719 A copper mine (situated close to Gunnislake village...1815-18 Produced an output of 4,141 tons. 1822 The mine changed hands. 1822-27 Produced an output of another...RIC Museum, Truro. HINGSTON DOWN MINE SX 47 409714 A tin & copper mine (situated on the crest of Hingston |
 | | Report (issue) |
| RHYOLITE Massive, locally flow banded, phenocrysts of quartz and feldspar in aphanitic matrix; includes some...red; 18 percent crystals; plagioclase, sanidine, quartz in approximate proportions 2:2:3; sparse biotite;...coarsegrained volcanic sand matrix TUFF OF EASTSIDE MINE Very pale orange to pale yellowish brown; 15 percent...percent crystals; plagioclase, sanidine, and quartz in approximate proportions 6:4:3, sparse biotite and...ASH-FLOW TUFF Very pale orange to gray, crystal-poor, quartz and biotite identified in hand specimen. This tuff |
 | | Book |
| Lower Paleozoic Sediments of the Cordillera Real, Bolivia H.-J. Schneider . . . . . . . . . . . . . . . ... 137 The Stratabound Kellhuani Tin Deposits, Bolivia B. Lehmann . . . . . . . . . . . . . . . . . .... . . . . . . . . 147 X Contents El Aguilar Mine: An Ordovician Sediment-Hosted Stratiform Lead-Zinc...Stratabound Iron Ores in the Silurian of Argentina and Bolivia M.-A. Boso and C. R. Monaldi . . . . . . . . ..... . . . . . . . . . . . . . . . . 279 Machcan Mine: A Pb-Zn Ore Deposit in Pucara Sediments of the |
 | | Report (issue) |
| and Grade-Tonnage Information on Low-Sulfide Au-Quartz Veins by James D. Bliss and Gail M. Jones Open-File...mineralogy of deposits classifed as lowsulfide Au-quartz veins were compiled for deposits found throughout...deposit. Table 4, part B, gives an alphabetic list of mine and properties followed by the deposit name. CHARACTERISTICS...tabulation have characteristics of low-sulfide Au-quartz veins as described in Berger (1986). These deposits...in detail. Alteration minerals associated with quartz in these deposits include carbonates (ankerite |
 | Boni, Maria, Terracciano, Rosario, Balassone, Giuseppina, Gleeson, Sarah A., Matthews, Alexander (2011) The carbonate-hosted willemite prospects of the Zambezi Metamorphic Belt (Zambia) Mineralium Deposita, 46 (7) 707-729 doi:10.1007/s00126-011-0338-7 | Journal (article/letter/editorial) |
| dolomites of low metamorphic grade. The Star Zinc and Excelsior prospects (Lusaka area), discovered in the early...prospects of the Lusaka area are Star Zinc and Excelsior (Figs. 3 and 5) (Sweeney 1990; Sweeney et al....prospecting rights to both the Star Zinc and Excelsior prospects, and since these are the most important...overlain by the Lusaka Dolomite (host of the Excelsior prospect), which possibly represents a thrust...hea shi S be Mwam 30° e r Zon 13 Star Zinc Excelsior Lusaka 13.5° Kafue Mazabuka 14° 0 PHANEROZOIC |
