 | | Journal (article/letter/editorial) | | 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...leucophoenicite, hedyphane, and sphalerite. Black willemite is common from the Sterling Hill mine, with the color due...associated with black willemite include löllingite, sphalerite, and fayalite (Dunn 1995). Specimens of willemite...major willemite specimen producer is the Tsumeb mine, Tsumeb, Otjikoto region, Namibia. Willemite specimens |  | | Journal (article/letter/editorial) | | The oldest known formation in the area is the Excelsior Shale of lower Paleozoic age, over which lie two...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 ......256 256 256 256 Introduction THE Carahuacra Mine • is located 170 km east of Lima in the departmentof |  | | Book (edition) | | hedenbergite), b) its meaning may shift over time - sphalerite, for instance, was dumped by early miners, while...Polymorphism as, for instance, found in the ZnS system (sphalerite/wurtzite), is often difficult to discern: Changes...replaced by sphalerite. Only under XPL it stands out from the lighter coronal sphalerite overgrowth by...to the next). Left: Galena (lighter grey) and Sphalerite (darker grey). When minimum/maximum values are...brown internal reflections) in a massive Fe-poor sphalerite (orange internal reflections), jordanite (dark |  | | Journal (article/letter/editorial) | | containsan early associationof pyrrhotite and FeS-rich sphalerite alteredby late fluidsto pyrite-marcasite and...pyrrhotite-stannite-chalcopyrite-sphalerite, and pyrrhotite (pyrite)-arsenopyrite-sphalerite. The latter association...reached on the fringes of Pb-Zn ore. Samplesof sphalerite from the pyrrhotite pipesthat contain local bandsof...resulted in a sharp increasein pH and depositionof sphalerite containing 0 to 10 and averaging3 mole percentFeS...general way with 'the presenceof late, low-FeS sphalerite. Residual hexagonalpyrrhotite is associatedwith |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | texturally massive pyrite, texturally massive sphalerite-galena-pyrite, and veins containing pyrite and...of pyrite that yields payable silver), massive sphalerite-galena-pyrite (with pipes of pyrrhotite), and...supergene copper deposits developed on massive sphalerite-pyrite-galena (and to a lesser extent on massive...massive pyrite. Mining of the massive argentiferous sphalerite-galena ores did not begin until 1955. The original...ShuCOLimestone Conglomerote Pucoro Group Mitu Group Excelsior Group Thrus| fault Fold axes 0 1 Fig. 2. Geologicmap |  | | Report (volume) | | _______________ _ 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...since 1940, nearly all from the Atacocha mine. Galena and sphalerite are the principal ore minerals. They |  | Mondillo, Nicola, Accardo, Mariafrancesca, Boni, Maria, Boyce, Adrian, Herrington, Richard, Rumsey, Mike, Wilkinson, Clara (2020) New insights into the genesis of willemite (Zn2SiO4) from zinc nonsulfide deposits, through trace elements and oxygen isotope geochemistry. Ore Geology Reviews, 118. 103307 doi:10.1016/j.oregeorev.2019.103307 | Journal (article/letter/editorial) | | Structurally-controlled hypogene deposits: Star Zinc, Excelsior, Surprise (Lusaka 29 30 31 area, Zambia), Kabwe...formal description of the mineral from the Altenberg mine (Moresnet, 69 Belgium) and he named the new mineral... 75 willemite locally replaces the original sphalerite, and is commonly associated with 76 franklinite...willemite, zincite and gahnite. The Star Zinc and Excelsior 85 occurrences in Zambia are of proposed mixed...Structurally-controlled hypogene deposits: Star Zinc, Excelsior, Surprise (Lusaka 120 121 122 area, Zambia) |  | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | carbonate-replacement Zn-Pb ores bearing Fe-rich sphalerite (up to 24 mol % FeS). The second mineralization...carbonate-replacement orebodies; in both cases, sphalerite is Fe poor and the inner parts of the orebodies...minerals to a poorly developed outer zone bearing sphalerite-galena ± kaolinite. The carbonate-hosted replacement...dickite, and an outer zone composed of Fe-poor sphalerite (in the range of 0.05–3.5 mol % FeS) and galena...those obtained for fluid inclusions in quartz and sphalerite from the second-stage ores (187°–293°C and 0 |  | | Book (edition) | | Metal : Sulfur, Selenium and Tellurium = 1:1 Sphalerite II/C.01-10 Metacinnabar II/C.01-30 Stilleite...hedenbergite), b) its meaning shifts over time - sphalerite, for instance, was dumped by early miners, while...(yellowish white), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. // Anhedral electrum...(greenish grey), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. // Anhedral electrum...(bluish grey shades), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. // 8 Gold A |  | 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) | | 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...vein 12.39 ± 0.06 Ma (alu, cpr 351) 9600 8800 Excelsior vein NNW B SSW Present day topography Santa...Formation (polymictic conglomerate) Devonian Excelsior Group (phyllite, shale, quartzite) FIG. 2. Geologic... and quartzite, which belong to the Devonian Excelsior Group (Jenks, 1951). They are unconformably overlain |  | 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...(2003), the precipitation of willemite, instead of sphalerite, from saline hydrothermal fluids is preferred...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 |  | | 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 |  | | Journal (article/letter/editorial) | | with associated hematite, pyrite, arsenopyrite, sphalerite, chalcopyrite, galena, electrum and gold. Adamellite...long. 134 32'E). The Tarcoola Blocks mine, the most important mine in the district, lies in the southwest...from fluid inclusion measurements, chlorite and sphalerite analyses and stable isotope analyses, form the...1990) / 0 0.5 I I Kilometres l Govemment Mine; Nonconformity Fault(observed) Fault(inferred)...(sealed) Railway ~ Quartz vein ~ Facing Blocks Mine r~ Alluvium ~ TarcoolaFm Silcrete ~ Qtz-bt-plag-microcline |  | | Report (issue) | | deposit. Table 4, part B, gives an alphabetic list of mine and properties followed by the deposit name. CHARACTERISTICS...likely to be present include pyrite, galena, sphalerite, and arsenopyrite (Berger, 1986). These minerals...of deposits used in Table 1 may represent a major mine, district name, or local town name or other prominent... Pyrrhotite appears to be been reported in just a single mine in the East Belt of the Sierra Nevada foothills...considered by mine operators to be correlated with better gold grades in both areas. Sphalerite was identified |  | | Journal (article/letter/editorial) | | fluids were also similar. Primary inclusionsin sphalerite,quartz,and dolomitehomogenized in the range 80ø...50øC. The majorityoœthe freezingtemperatures for sphalerite andquartzwere in the range--20ø to --23.6øC,corresponding...prospectingPennsylvanian(Fig. 2). Minor amountsof sphalerite havebeencarriedout sincethen. The largestpro-...and Paragenesis The primary mineralsconsistof sphalerite,galena, ously. Chalcopyriteand pyrite occur in...stonehostrock. Thepinkspartendsto be slightly later than sphalerite in the depositional sequence; however, thereare |  | | 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.. |  | Rottier, B., Kouzmanov, K., Casanova, V., Wälle, M., Fontboté, L. (2018) Cyclic Dilution of Magmatic Metal-Rich Hypersaline Fluids by Magmatic Low-Salinity Fluid: A Major Process Generating the Giant Epithermal Polymetallic Deposit of Cerro de Pasco, Peru. Economic Geology, 113 (4) 825-856 doi:10.5382/econgeo.2018.4573 | Journal (article/letter/editorial) | | 500 m: (1) pyrrhotite pipes grading outward to sphalerite and galena replacement bodies (stage A), (2)...temperature. Trace element LA-ICP-MS analyses of sphalerite, pyrite, and enargite also reveal important compositional...and the measured trace element composition of sphalerite, pyrite, and enargite has not been found in most...crosscuts weakly metamorphosed mid-Paleozoic slates (Excelsior Group) and conglomerates and sandstone of the...extent, which grade outward into massive Fe-rich sphalerite and galena replacement bodies. These pipes are |  | | Journal (article/letter/editorial) | | mainly composed of Paleozoic phyllites of the Excelsior Group, Permo-Triassic volcaniclastic rocks of...sedimentary rocks and Miocene intrusions (Fig. 1). The Excelsior Group is the oldest rock unit exposed in the district...distinct angular unconformity exists between the Excelsior phyllites and the overlying Mitu volcaniclastic...and 2), the vein ore type is restricted to the Excelsior phyllites, Mitu volcanic rocks and Tertiary intrusions...clasts of the base metal stage consisting of sphalerite, galena and quartz, set in a matrix of carbonate |  | Benites, Diego, Torró, Lisard, Vallance, Jean, Laurent, Oscar, Valverde, Pablo E., Kouzmanov, Kalin, Chelle-Michou, Cyril, Fontboté, Lluís (2021) Distribution of indium, germanium, gallium and other minor and trace elements in polymetallic ores from a porphyry system: The Morococha district, Peru. Ore Geology Reviews, 136. 104236pp. doi:10.1016/j.oregeorev.2021.104236 | Journal (article/letter/editorial) | | other minor and trace elements contents in 18 sphalerite, chalcopyrite, galena, and tetrahedrite-tennantite...indicate that In and Ga concentrate mostly in sphalerite (Inter-Quartile 22 Range [IQR] 217-2.7 ppm...generations of sphalerite and chalcopyrite, the contents of In and 25 Ga in sphalerite are at least two...(IQR 1.2-0.19 ppm), although late Fe-poor 27 sphalerite may yield much higher values (IQR 129-74 ppm)...hydrothermal feeders. The highest In values in sphalerite 31 are found in high-sulfidation assemblages |  | Rottier, B., Kouzmanov, K., Wälle, M., Bendezú, R., Fontboté, L. (2016) Sulfide Replacement Processes Revealed by Textural and LA-ICP-MS Trace Element Analyses: Example from the Early Mineralization Stages at Cerro de Pasco, Peru. Economic Geology, 111 (6) 1347-1367 doi:10.2113/econgeo.111.6.1347 | Journal (article/letter/editorial) | | (A) several pyrrhotite pipes grading outward to sphalerite and galena replacement bodies, (B) a massive...metamorphosed shales of the middle Paleozoic Excelsior Group, the oldest lithological unit in the area...latter is part of the Pucará Group that overlies Excelsior and Mitu Groups (Angeles, 1999; Rosas et al.,...(Fig. 1A). These dikes do not propagate into the Excelsior shales west of the diatreme-dome complex; to the... 2). They grade outward into massive Fe-rich sphalerite (up to 80% in volume) and galena. They are hosted |  | | Report (volume) | | group........................... Quartz-galena-sphalerite group.............................. Telluride............................................... Sphalerite (zinc blende) ........................................................ Precipitation due to sphalerite.............................. 54 55 55 56 57.......................................... 74 Excelsior.................................................... Ute and Ulay mine.......................'................. Hidden Treasure mine................. |  | | Journal (issue) | | fluorite crystal group, 7 cm, from the Huanzala mine, Dos de Mayo Province, Peru. Marty Zinn collection;...province, department of Huanuco Huanzala mine Mercedes mine Chiurucu mine Uchucchacua district, Dos de mayo...mayo province, department of Huanuco Hercules mine, Ticapampa district, Recuay and Aija provinces, department...Carrion province, department of Pasco Colquijirca mine, Cerro de Pasco province, department of Pasco Atacocha...Huarochiri province, department of Lima Santa Rita mine, Morochocha district, Yauli province, department |  | | Journal (article/letter/editorial) | | Mineral g 2449 Sphalerite, g 2493 Sphalerite, g 2455 Sphalerite, g 2497 Sphalerite, 12055 Sphelerite...g 2507 Sphelerite, g 2494 Sphalerite, 061105 Sphalerite. 31654 *Sphalerite, 170050 Zincite, g 6511 Franklinitct...g 19363 Hemimorphitc, 470233 Adamite, 470232 Sphalerite, l table. Locality Picas de Europa, Santander...Franklin, SJ. USA Excelsior Zinc 3line. Lusaka, S. Rhodesia. Tarnowitz, Silt-ia El Potosi Mine. Santa Eulalia...Eulalia. Chihuahua, Mexico Ojucla Mine, Mapimi, Durango, Mexico Numbers refer to the collection in the Swedish |
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