| Deposit ID | 10058199 |
|---|---|
| MRDS ID | TC04069 |
| Record type | Site |
| Current site name | El Bronce Mine |
| Alternate or previous names | Bronce Viejo, El Bronce De Petorca, El Bronce Sector Carmen Level, Ore Shoots Rosario I, Ii, Iii, Vein: El Bronce Vein |
| Geographic coordinates: | -70.9362, -32.17579 (WGS84) |
|---|---|
| Elevation | 1220 |
| Relative position | 60KM SOUTH OF SALAMANCA, 150 KM N OF SANTIAGO, 8 KM N OF PETORCA |
Political divisions (FIPS codes)
Chile(country)
South America(continent)
Land(continent)
| Country |
|---|
| Chile |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Primary |
| Zinc Critical | Secondary |
| Copper | Secondary |
| Lead | Secondary |
| Materials | Type of material |
|---|---|
| Bornite | Ore |
| Chalcopyrite | Ore |
| Galena | Ore |
| Gold | Ore |
| Pyrite | Ore |
| Smithsonite | Ore |
| Sphalerite | Ore |
| Tennantite | Ore |
| Tetrahedrite | Ore |
| Ankerite | Gangue |
| Barite | Gangue |
| Chlorite | Gangue |
| Epidote | Gangue |
| Hematite | Gangue |
| Magnetite | Gangue |
| Pyrrhotite | Gangue |
| Quartz | Gangue |
| Sericite | Gangue |
| Siderite | Gangue |
| Result | 20 G/T AU |
|---|---|
| Result | 8-10 G/T AU IN PRIMARY ZONE |
| Result | GOLD VARIES FROM 5 TO 28 MICRONS BUT UP TO 1 MM |
| Result | FLUID INCLUSIONS ARE 2 PHASES, VAPOR AND LIQUID, 150-344 DEGREES C |
| Result | DELTA 34 S VALUES -0.5 TO -0.6 PER MIL FOR CHALCOPYRITE, -2.3 TO 0.7 FOR SPHALENITE AND -3.8 TO 2.1 PER MIL FOR PYRITE SUGGESTING A MAGMATIC SOURCE FOR THE S, MINERALIZATION DEVELOPED NO MORE THAN 400 M BELOW PALEOSURFACE. |
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Diorite | ||||
| Rock unit name | San Lorenzo Superunit | ||||
| Rock description | San Lorenzo Superunit | ||||
| |||||
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Sandstone |
| Rock unit name | Cerro Morado Formation;Cerro Morado Formation;Cerro Morado Formation;Cerro Morado Formation |
| Rock description | Cerro Morado Formation;Cerro Morado Formation;Cerro Morado Formation;Cerro Morado Formation |
| (1) | -70.9362, -32.17579 |
|---|
| Type of structure | Local |
|---|---|
| Structure description | Morro Hediondo Caldera |
| Name | EL BRONCE SECTOR |
|---|---|
| Strike | N10-20E}}} |
| Dip | 70-85E}}} |
| Thickness | 20M |
| Length | 2000M |
| Width | 400M |
| Depth to bottom | 450M |
| Name | ROSARIO I |
|---|---|
| Dip | 70-85E}}} |
| Thickness | 3M |
| Length | 250M |
| Width | 150M |
| Name | ROSARIO II |
|---|---|
| Dip | 70-85E}}} |
| Thickness | 5M |
| Length | 280M |
| Width | 250M |
| Name | ROSARIO III |
|---|---|
| Dip | 70-85E}}} |
| Thickness | 20M |
| Length | 550M |
| Width | 400M |
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1850 |
| District name | El Bronce |
|---|
| Type | Owner |
|---|---|
| Owner | Compania Minera El Bronce |
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1988 | ||||||||||||||
| |||||||||||||||
| Type | In-situ | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1991 | |||||||||||||||||||||
| Total resources | 24000000mt ore | |||||||||||||||||||||
| ||||||||||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | TC04069 |
RUIZ, C. Y PEEBLES, F., 1988, YACIMIENTOS METALIFEROS DE CHILE: SANTIAGO, 334 P.
CAMUS, F. Y DUHALDE, M.A., 1982, GEOLOGIA DE LOS YACIMIENTOS HIDROTERMALES DE ORO EN CHILE: REV. GEOL. DE CHILE, 17, P. 47-70.
ELEVATORSKI, E.A., WORLD GOLD: MINES-DEPOSITS-DISCOVERIES, VOL. 1: NORTH, CENTAL, AND SOUTH AMERICA: MINOBRAS MINING SERVICES.
SERPLAC, 1981, ESTUDIO DEL SECTOR MINERO DE LA V REGION: SANTIAGO (6 VOLS.).
ENAMI, 1932, #5060.
CIMRI
| Subject category | Comment text |
|---|---|
| Deposit | Discovery Year: 18C |
| Deposit | PART OF THE EL BRONCE EPITHERMAL SYSTEM |
| Deposit | LONGITUDINAL SECTIONS. |
| Deposit | RECORD TC04070, ROSARIO, COMBINED WITH THIS RECORD. ; INFO.SRC : 1 PUB LIT |
| Deposit | VERTICAL ZONATION OF, FROM SURFACE, UPPER BARREN CHALCEDONIC QUARTZ +/- CARBONATE. TO QUARTZ +/- CARBONATE +/- BARITE, SUBECONOMIC AU +/- AG +/- BASE METALS + PYRITE TO HIGH GRADE ZONE WITH ECONOMIC AU + AG +/- BASE METALS QUARTZ + PYRITE + SPHALERITE + CHALCOPYRITE + CARBONATE TO LOWER ZONE QUARTZ + PYRITE + CHLORITE, SUBECONOMIC AU-AG, NO BASE METALS. EL BRONCE SECTOR CONSISTS OF A SINGLE MAJOR COMPLEX STRUCTURE WITH 3 MAJOR ORE SHOOTS; AT N END SPLITS INTO A SERIES OF PARALLEL-SUBPARALLEL VEINS AND EXTENSIONAL FRACTURES THAT EXTEND 500-600 M ALONG STRIKE AND ENCOMPASS AN AREA OF 200-250 M WIDE (GUANACO SECTOR) POST MINERAL TRANSCURRENT FAULTS WITH VERTICAL DISPLACEMENTS UP TO 100 M. EACH ORE SHOOT CONTAINS COMBINATIONS OF HYDROTHERMAL BRECCIA ORE, MASSIVE, STOCKWORK, AND DISSEMINATED ORE. OREBODY 4 HAS POST MINERAL FAULTS WITH VERTICAL DISPLACEMENTS OF 50-100 M WITH CLAY ZONES AND LATER ANDESITIC DIKES. RUNS FROM <2 TO >20 G/MT AG AND <2 TO <20 G/MT AU, AS SHOWN ON |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-SEP-1990 | Williams, William C. | University of Arizona | |
| Updater | 01-NOV-1993 | Page, Norman J. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.