Description
William Braden
Commodities
PrimaryCopper, Molybdenum
SecondaryGold, Silver, Lead, Zinc
Commodity typeM
Deposit
Deposit sizeL
Orebody formTABULAR & CRESCENT SHAPED
Ore controlSteeply Dipping West Limb Of Anticline Was Zone Of Weakness Intruded By Cobre Porphyry
Materials
Ore mineralsBornite, Chalcocite, Chalcopyrite, Chrysocolla, Copper, Covellite, Cuprite, Galena, Malachite, Molybdenite, Sphalerite, Tenorite, Tetrahedrite
GangueCalcite, Chlorite, Dolomite, Epidote, Orthoclase, Pyrite, Sericite
Geology
Host rockTonalite · Cerro Negro Formation, Shl, Limestone, Sst;Potrerillos Formation, Shl, Limestone, Sst, Sills Of Melaphyre Occur In Shl
Associated rockTonalite · Post Mineral Dikes, Andesite & Diorite Porphyry;;Rhyolite Volcanic Dikes, Flows, And Breccia;Andesite Volcanic Flows & Breccia
StructureNorth Trending Fold, Faults And Plutonic Masses. Along Falla Oeste., Structure Consists Of Asymmetric Anticline; Porphyry Stock Intruded Into West Flank Of Anticline; 3 Ages Of Faults: Pre-Andesite, Pre-And Post-Porphry. Anticline Strikes N 10 Deg E. 32ma Ew Dikes Suggest Ew Conpression (Ns Tension) At This Time
Tectonic settingAndean Cordillera And Batholith
AlterationHydrothermal Alteration, Contact Metamorphism. Sericitization In Stockwork, Propylitization In Halo. Potassic, Phyllic.
Economic & production
Development statusProducer
First production1926
Last production1959
Discovery year1894
Identification
Deposit ID10110362
MRDS IDW001550
RegionSA
Data scoreB
Coordinates-26.47415, -69.42951
References
BEALL, J.V., 1969, COPPER INTHE ANDES: MIN. ENG. V. 21, NO. 11, P.51-90RUIZ, F., CARLOS, 1965, GEOLGIA Y YACIMIENTOS METALIFEROS DE CHILE: INST. INV. GEOL. CHILE, P. 184-186, (SPANISH)MARCH, W., 1933, COPPER RESOURCES OF THE WORLD: INTERNAT. GEOL. CONG. 16TH WASH. D.C. P. 485-500HOLLISTER, V. F., 1973, REGIONAL CHARACTERISTICS OF PORPHYRY COPPER DEPOSITS OF SOUTH AMERICA, A.I.M.E. PREPRINT 73-I-2 P. 29RUIZ, C. AND PEEBLES, F., 1988, YACIMIENTOS METALIFEROS DE CHILE: SANTIAGO, 334 P.DIAZ, ET AL., 1980, MAPA METALOGENICO PRONOSTICO DE LA III REGION: CORPORACION DE FOMENTO DE LA PRODUCCION, SANTIAGO (5 VOLS.)MARCH, W., 1933, ORE DEPOSITS AT POTRERILLOS (CHILE), IN COPPER RESOURCES OF THE WORLD, XVI IGC, WASHINGTON, P. 485-500.SILLITOE, R.H., 1988, EPOCHS OF INTRUSION-RELATED COPPER MINERALIZATION IN THE ANDES: JOUR S. AM EAR SCI, 1, 89-108.OLSON, S.F., 1989, THE STRATIGRAPHIC AND STRUCTURAL SETTING OF THE POTRERILLOS PORPHYRY COPPER DISTRICT, NORTHERN CHILE; REV. GEOL CHILE, 16, 3-29.CIMRIMARCH, 1933, REF.; OLSON, 1989.INFO. LACKING TO ESTIMATE 3/73