 | | Journal (article/letter/editorial) | | AND SUPERGENE WEATHERING IN THE EL PEÑÓN DISTRICT, NORTHERN CHILE IAN WARREN,† Yamana Gold, 9670 Gateway...Zealand Abstract The El Peñón epithermal gold-silver deposit, Region II, Chile, comprises multiple epithermal...in the Paleocene metallogenic belt of northern Chile. Quartz-adularia-carbonate veins are hosted in Paleocene...related to precious metals mineralization of the El Peñón deposit. Timing of hydrothermal activity in the...Adularias from the three largest veins of the El Peñón deposit are dated at 52 to 53 Ma (40Ar/39Ar), |  | | Journal (article/letter/editorial) | | Volcanic rocks hosting quartz ± calcite ± adularia ± illite epithermal deposits undergo elemental mass changes...important hydrothermal minerals (e.g., adularia, illite, smectite) and alteration processes that are reflected...metal epithermal quartz ± calcite ± adularia ± illite deposits (e.g., Buchanan, 1981; White † Corresponding...alteration minerals for the El Peñón epithermal deposit, northern Chile. The same techniques are applied...K-mica (pure end member of illite) and K-rich clays (illite and interlayered illite-smectite). Their stabilities |  | | Book | | label: Aerial view of the Bingham Canyon copper mine, Kennecott Utah Copper, September 2003. Photo courtesy...and CopperGold Deposits at Los Pelambres, Central Chile José Perelló, Richard H. Sillitoe, Constantino...of the Río Blanco-Los Bronces District, Central Chile: Development of World’s Greatest Known Concentration...Northern Chile Geologic Overview of the Escondida Porphyry Copper District, Northern Chile Geology of...N. Moreto, André Luiz Silva Pestilho, Mineral Province, Brazil Gustavo Henrique Coelho de Melo, Marco |  | Rehrmann, Stephanie, Augustsson, Carita, Izaguirre Valdez, Rocio Nereyda, Jenchen, Uwe, Schulte, Peter (2012) Provenance and depositional conditions of Cretaceous–Paleogene boundary sandstones from northeastern Mexico. Sedimentary Geology, 282. 321-335 doi:10.1016/j.sedgeo.2012.10.002 | Journal (article/letter/editorial) | | Los Ramones Rancho Nuevo Loma Cerca El Peñón El Mulato La Lajilla El Mimbral La Ceiba the Gulf of Mexico...Maastrichtian El Cerrito section in Linares (Ekdale and Stinnesbeck, 1998), and the well-known El Peñón K–Pg section...Oriental in the west and the Gulf of Mexico Coastal Province in the east, a passive continental margin, which...Echanove, 1986). Benthic foraminifera assemblages at El Peñón indicate middle bathyal Please cite this article...LB Torreón syntaxis 25°N Monterrey BB El Cerrito, El Peñón Ali 25°N rc ca ati gm ma G u lf |  | | Journal (article/letter/editorial) | | disseminated bodies Silicification, quartz-sericite/illite Main gangue minerals Steep and shallowly inclined...magmatic condensates Neutral-pH chloride water Illite, smectite IS, LS Commonly proximal Neutral-pH...lithocap of the Marte porphyry gold deposit, northern Chile (see Sillitoe 1994). b Steam-heated alteration exposed...Norte HS gold-silver orebody at La Coipa, northern Chile. Note its white, friable character. c Steam-heated...peripheral to the La Coipa HS-IS gold-silver district, Chile. f Hydrothermal breccia, generated by shallow-seated |  | Poblete, J. A., Bissig, T., Mortensen, J. K., Gabites, J., Friedman, R., Rodriguez, M. (2014) The Cerro Bayo District, Chilean Patagonia: Late Jurassic to Cretaceous Magmatism and Protracted History of Epithermal Ag-Au Mineralization. Economic Geology, 109 (2) 487-502 doi:10.2113/econgeo.109.2.487 | Journal (article/letter/editorial) | | Av. Vitacura 5250, Of. 404 Vitacura, Santiago, Chile Abstract The Cerro Bayo low sulfidation epithermal...tip of the Deseado Massif epithermal silver-gold province. Mineralization is hosted in the mainly rhyolitic...mineralization in the Patagonian Andes of southern Chile. The protracted history of epithermal processes...Late Jurassic (e.g., El Faldeo: Palacios et al., 1997) to Late Cretaceous (e.g., El Toqui: Townley, 1997;...71°50'W in Chile, near the international border with Argentina and 14 km west of the town of Chile †Corresponding |  | | Journal (article/letter/editorial) | | deposit associated with quartz ± calcite ± adularia ± illite assemblages located in the Coromandel peninsula...deposits associated with quartz ± calcite ± adularia ± illite assemblages, is the destruction of igneous plagioclase...the replacement of plagioclase by adularia and/or illite. Calcium depletion also reflects the destruction...deposits associated with quartz ± calcite ± adularia ± illite assemblages. Potassium, Na, Rb, Sr, and Ca enrichment...deposits associated with quartz ± calcite ± adularia ± illite assemblages. However, the area defined by low δ18O |  | Essarraj, Samira, Boiron,, Marie Christine, Cathelineau, Michel, Tarantola, Alexandre, Leisen, Mathieu, Boulvais, Philippe (2017) Basinal Brines at the Origin of the Imiter Ag-Hg Deposit (Anti-Atlas, Morocco): Evidence from LA-ICP-MS Data on Fluid Inclusions, Halogen Signatures, and Stable Isotopes (H, C, O)—A Reply. Economic Geology, 112 (5) 1273-1277 doi:10.5382/econgeo.112.5.dis2 | Journal (article/letter/editorial) | | and development of the Central Atlantic magmatic province as the main ore-forming processes that triggered...Rifting and Development of Central Atlantic Magmatic Province To determine the source of the mineralizing brines...gradient related to the Central Atlantic magmatic province lies in its inconsistency with geologic and paleogeographic...Permian brines and the Central Atlantic magmatic province as the main ore-forming process because Permian-Triassic...Lheur, C., 2011, Imiter: Morocco’s greatest silver mine: Mineralogical Record, v. 42, p. 107–135. Benchekroun |  | Levresse, Gilles, Bouabdellah, Mohammed, Gasquet, Dominique, Cheilletz, Alain (2017) Basinal Brines at the Origin of the Imiter Ag-Hg Deposit (Anti-Atlas, Morocco): Evidence from LA-ICP-MS Data on Fluid Inclusions, Halogen Signatures, and Stable Isotopes (H, C, O)—A Discussion. Economic Geology, 112 (5) 1269-1272 doi:10.5382/econgeo.112.5.dis1 | Journal (article/letter/editorial) | | and development of the Central Atlantic magmatic province as the main ore-forming processes that triggered...Rifting and Development of Central Atlantic Magmatic Province To determine the source of the mineralizing brines...gradient related to the Central Atlantic magmatic province lies in its inconsistency with geologic and paleogeographic...Permian brines and the Central Atlantic magmatic province as the main ore-forming process because Permian-Triassic...Lheur, C., 2011, Imiter: Morocco’s greatest silver mine: Mineralogical Record, v. 42, p. 107–135. Benchekroun |  | Leary, Stephen, Sillitoe, Richard H., Stewart, Peter W., Roa, Karl J., Nicolson, Benjamin E. (2016) Discovery, Geology, and Origin of the Fruta del Norte Epithermal Gold-Silver Deposit, Southeastern Ecuador. Economic Geology, 111 (5) 1043-1072 doi:10.2113/econgeo.111.5.1043 | Journal (article/letter/editorial) | | >300-m-wide vein-stockwork associated with quartz-illite-pyrite alteration. The deposit comprises two principal...due to a national moratorium on exploration and mine development activities imposed by the Ecuadorian...complete feasibility studies for a bulk underground mine and gravity, flotation, and tailings leach facility...typically propylitic altered, but strongly silica-illite-pyrite altered where principal host to zone...pale-green clay mineral is visually identified as illite. Pre-epithermal porphyry copper alteration Several |  | | Book (edition) | | especies. Cabe señalar la actuación de Roberto Beder por el aporte del estudio de los minerales en las calizas...Brodtkorb, M.K. de, Gordillo, C. y Gay, H.D., 1983, el número de minerales ascendía a 466 debido principalmente...incorporación del estudio de minerales radiactivos. El anexo de la tercera versión, publicado por Milka...Pezzutti, S. Tourn, y M.E. Vattuone constó de 3 tomos. El primero incluyó las clases I (elementos) y II (sulfuros...sulfosales, seleniuros y telururos), publicado en 2002. El Tomo 2, involucró las clase III (halogenuros), clase |  | Simpson, Mark P., Gazley, Michael F., Stuart, Alistair G.J., Pearce, Mark A., Birchall, Renee, Chappell, Debra, Christie, Anthony B., Stevens, Murray R. (2019) Hydrothermal Alteration at the Karangahake Epithermal Au-Ag Deposit, Hauraki Goldfield, New Zealand. Economic Geology, 114 (2) 243-273 doi:10.5382/econgeo.2019.4630 | Journal (article/letter/editorial) | | Australia 6630, Australia 3 Fraser Thomas Ltd, 21 El Kobar Drive, East Tamaki, Auckland 2013, New Zealand...chlorite, adularia, albite, illite, pyrite, calcite, mixed-layered illite-smectite, smectite, and rare...to 500 m from the Maria and Welcome/Crown veins. Illite is broadly coextensive with and locally occurs...halo. The zone of illite alteration is bordered to the east by patchy mixed-layered illite-smectite and outlying...Welcome/Crown veins are altered to adularia, albite, illite, chlorite, and rare calcite and epidote. Automated |  | | Journal (article/letter/editorial) | | and vanadocrete (vanadate). Panczner 1987 Tajo Mine, Hidalgo del Parral, Chihuahua, Mexico Panczner...Baumgarten et al. 2008 Dill et al. 1997a Cajamarca Province Peru Palache et al. 1951 Malpelo Island, Colombia...Agua Shuca Cerro Blanco El Salvador Schneider 1958; Cazañas et al. 2003 El Cobre Cuba Camprubí et...Maksaev et al. 2007; Singer et al. 2008 Tarapaca Chile Cu porphyry-type Cu volcanicBouzari & Clark 2002;...Maksaev et al. 2007; Singer et al. 2008 Arica Chile Zn-(Bb-Ba) non-sulfidic/ Soares Monteiro et al |  | | Book | | is the minimum grade at which it is worthwhile to mine a certain deposit. Everything below it (low-grade...chalcopyrite (brass) from the Friedrich-Christian Mine in Wildschapbach, Black Forest (Germany) (photo...black Fig. 1.2 Chalcopyrite on quartz. Silberwiese Mine, Oberlahr, Westerwald (Germany) (photo © Monika...CuS (Fig. 1.4). Fig. 1.5 Chalcocite from Mammoth Mine, Mount Isa-Cloncurry Territory (Queensland, Australia)...Introduction Fig. 1.6 Tetrahedrite from Wenzel Mine in Oberwolfach, Black Forest (Germany) (photo © |  | | Report (issue) | | CAMBODIA CAMEROON CANADA CENTRAL AFRICAN REPUBLIC CHAD CHILE CHINA COLOMBIA COMOROS CONGO COSTA RICA CÔTE D’IVOIRE...DJIBOUTI DOMINICA DOMINICAN REPUBLIC ECUADOR EGYPT EL SALVADOR ERITREA ESTONIA ESWATINI ETHIOPIA FIJI FINLAND...URANIUM DEPOSITS, THE CENTRAL UKRAINIAN URANIUM PROVINCE ................................................4.1 Objective Evaluation of P2O5 and uranium in El-Sebaiya and Abu-Tartur areas to determine the added...Key results The inferred phosphate resources in El-Sebaiya area are about 80 million tons with an average |  | Camprubí, Antoni, Chomiak, Beverly A., Villanueva-Estrada, Ruth E., Canals, Àngels, Norman, David I., Cardellach, Esteve, Stute, Martin (2006) Fluid sources for the La Guitarra epithermal deposit (Temascaltepec district, Mexico): Volatile and helium isotope analyses in fluid inclusions. Chemical Geology, 231 (3) 252-284 doi:10.1016/j.chemgeo.2006.02.002 | Journal (article/letter/editorial) | | Temascaltepec area, three main vein sets occur from NW to SE: El Coloso, La Guitarra, and Mina de Agua (Fig. 1) which...length of the vein deposit formed by La Guitarra and El Coloso veins zones altogether is more than 3.5 km...latter includes the rhyolitic feeder neck of Cerro El Peñón, dated at 34.87 ± 0.15 Ma by the 40Ar/39Ar method...late-Laramide granitic suite, whilst the veins of El Coloso area are hosted by all the lithological units...quartzfilled veins and veinlets, and kaolinite–illite–smectite alteration dominates the upper part of |  | | Journal (article/letter/editorial) | | nontronite, illite, chlorite (mainly on granite), CA: Regolith: kaolinite (common), illite, chlorite,...9 See Table 3a See Table 3a CA: Regolith: illite, illite-chlorite-vermiculite mixed-layer, vermiculite...(Figure 15). In the VLG-type kaolinite co-exists with illite-muscovite, chlorite and vermiculite as a primary...sampled at the same site of observation made up of Illite/muscovite < 70%, vermiculite < 30%, kaolinite <...Geomorphological evolution of the Tilcara alluvial fan (Jujuy Province, NW Argentina): Tectonic implications and palaeoenvironmental |  | | Book | | . . . . . 6.4.5 The Namaqua-Natal Metamorphic Province . . . . . . . . . . . . . . . . 6.5 Neoproterozoic:... . . . . . . . . . . . . 18.4.3 The Tocantins Province: Archean Greenstone Belts, Paleoproterozoic Terranes...Craton . . . . . . . . . . . 18.4.4 The Borborema Province . . . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . 23.8.1 Rosh Pinah Mine . . . . . . . . . . . . . . . . . . . . . . . ....Alegre F Congo–Sao Francisco (plus Borborema province) Piquete Formation PF 24 22 10 500 K–Ar |  | | Book (edition) | | Dry-stacked tailing, such as used at La Coipa (Chile), has additional benefits of cyanide recycling and...Australia and is currently extending to applications in Chile and Peru. An important lesson from all of the major...socioenvironmental impact through the entire life cycle of the mine, it is important to aim at getting it “right the...gold mills in the world (despite being a copper mine). Concentration of gold by gravity has seen innovation...Mining, Metallurgical, and Petroleum Engineers acid mine-drainage Advanced Mineral Identification and Characterisation |
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