 | Gibson, Peter Craig, Noble, Donald C., Benavides, Raúl G., Mayta, Oscar T. (1993) Discovery, Development, and Production of a Blind Ag-Au Bonanza in the Calera Vein, Orcopampa District, Peru. International Geology Review, 35 (9) 780-796 doi:10.1080/00206819309465557 | Journal (article/letter/editorial) | | Blind Ag-Au Bonanza in the Calera Vein, Orcopampa District, Peru a a b Peter Craig Gibson , Donald C...Blind Ag-Au Bonanza in the Calera Vein, Orcopampa District, Peru, International Geology Review, 35:9, 780-796...Blind Ag-Au Bonanza in the Calera Vein, Orcopampa District, Peru 1 P E T E R C R A I G G I B S O N , D...Villaran 790, Urbanization Santa Catalina, Lima 13, Peru Downloaded by [University of Montana] at 11:04...veins of the adularia-sericite type in the Orcopampa district were worked during Spanish times and since |  | Gibson, Peter Craig, McKee, Edwin H., Noble, Donald C., Swanson, Kirk E. (1995) Timing and interrelation of magmatic, tectonic, and hydrothermal activity at the Orcopampa District, southern Peru. Economic Geology, 90 (8) 2317-2325 doi:10.2113/gsecongeo.90.8.2317 | Journal (article/letter/editorial) | | TECTONIC, AND HYDROTHERMAL AT THE ORCOPAMPA DISTRICT, SOUTHERN PERU ACTIVITY PETER CRAIG GIBSON,* MackaySchool...laharic breccias intercaat theOrcopampa district,southern Peru(Fig.1).Thesedata lated with flows of two-pyroxene...subjacent epithermal precious metaldeposits. Orcopampa is oneof a Mesozoic quartzite and limestone. groupof...withlittle locatednorth-northwest of the city of Arequipa(Fig. 1). angular discordance in the mine area...tuffisrelatedtothecollapse about 18 km southwest of the Orcopampa district at about20 small-scale miningcontinued intermittently |  | Echavarria, L., Nelson, E., Humphrey, J., Chavez, J., Escobedo, L., Iriondo, A. (2006) Geologic Evolution of the Caylloma Epithermal Vein District, Southern Peru. Economic Geology, 101 (4) 843-863 doi:10.2113/gsecongeo.101.4.843 | Journal (article/letter/editorial) | | Geologic Evolution of the Caylloma Epithermal Vein District, Southern Perú LEANDRO ECHAVARRIA,* ERIC NELSON...Carmen N°180, El Vivero de Monterrico, Surco-Lima, Peru AND ALEX IRIONDO** Department of Geological Sciences...silver- and base metal-rich Caylloma epithermal district in the Tertiary volcanic belt of southern Perú...dome). Gangue minerals include quartz, calcite, rhodonite, rhodochrosite, pyrite and minor adularia, illite...sulfides, coarse- to medium-grained quartz, late rhodonite + calcite + chalcedony) are a few millimeters |  | | Journal (article/letter/editorial) | | deep-seatedhydrothermalfluids. Introduction Orcopampa has been known and intermittently worked since...districtsupportedproductionof less (e.g.,Petersen,1965). Orcopampa,locatedabout150 than 500 tonsper day of silverore...silverore from severalvein km northwestof Arequipa (Fig. 1), is one suchepi- systems.However,with the discoveryof...discoveryof a largetonthermal district. nage of rich ore containinggold as well as silver in the Calera...Presentaddress:ATIMM, S.A., Canavaly Moreyra 654, Lima 27, Peru. level of about 1,200 tonsper day. In 1988 and 1989 |  | | Journal (article/letter/editorial) | | epithermal gold deposits, Cirotan (Indonesia), Orcopampa (Peru) and Cavnic (Romania). In these deposits, the...with the deposition of Mn silicate, close to the rhodonite end-member (MnSiO3), that fully or partially grades...2.6 wt% NaCl eq., the final comb quartz from Orcopampa excepted. Two isenthalpic boiling events are recorded...with brittle deformation. The replacement of rhodonite by rhodochrosite revealed in each sequence of...structure, rhodonite, rhodochrosite, fluid inclusions, boiling, Cirotan, Indonesia, Orcopampa, Peru, Cavnic |  | Chauvet, Alain, Bailly, Laurent, André, Anne-Sylvie, Monié, Patrick, Cassard, Daniel, Tajada, Fernando Llosa, Vargas, Juan Rosas, Tuduri, Johann (2006) Internal vein texture and vein evolution of the epithermal Shila-Paula district, southern Peru. Mineralium Deposita, 41 (4) 387-410 doi:10.1007/s00126-006-0068-4 | Journal (article/letter/editorial) | | evolution of the epithermal Shila-Paula district, southern Peru Received: 28 July 2005 / Accepted: 25 April...2006 Abstract The epithermal Shila-Paula Au–Ag district is characterized by numerous veins hosted in Tertiary...volcanic rocks of the Western Cordillera (southern Peru). Field studies of the ore bodies reveal a systematic...C., Luis N. Saenz 447-449, Jesus Maria, Lima 21, Peru J. Tuduri ISTO, CNRS-UMR 6113, University of Orléans...Epithermal gold . Breccia . Structural control . Peru Introduction Epithermal deposits often occur in |  | | Journal (article/letter/editorial) | | Epithermal Silver Veins of the Arcata District, Southern Peru HUGO CANDIOq'rI DE LOS Rios, MauricioHochschildy..., S.A.,AvenidaRep•blica de Panamd3055, Lima 27, Peru DONALD C. NOBLE, MackaySchoolof Mines,Universityof...greater depthsthan in the producingveinsof the district. Fluid inclusionstudiesgive Th between175ø and...the Huanzo Cordillera 180 km north-northwestof Arequipa at an elevationof between about 4,600 and 4,900...epithermal Au-Ag property located southeastof Orcopampa(Fig. 1), recently went into production. Two of |  | | Book (edition) | | producing, developing countries, such as Chile, Peru, Zambia and ZaIre, increased production irrespective...part of the Hidden Treasure manto, Ophir mining district, Utah. (After Gilluly 1932.) 30 CHAPTER 2 ...outcrop or suboutcrop. For the location of this are district sec Fig. 18.10. (After Du Toit 1954.) 1979 prices...stocks, as at Butte, Montana, and Cerro de Pasco in Peru. It is found also in hot spring environments and...mineralizing fluids at the Ag-Pb-Zn-Cu Casapalca Mine, Peru were of magmatic origin, whereas for the Pasto Buena |
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