| Deposit ID | 10098728 |
|---|---|
| MRDS ID | MX00099 |
| Record type | Site |
| Current site name | El Arco |
| Alternate or previous names | Calmalli, Don Carlos |
| Geographic coordinates: | -113.38544, 28.05579 (WGS84) |
|---|
Political divisions (FIPS codes)
Pima(county)
Arizona(state)
United States(country)
North America(continent)
Land(continent)
| Country | State |
|---|---|
| Mexico | Baja California |
| Commodity | Importance |
|---|---|
| Copper | Primary |
| Gold | Secondary |
| Molybdenum | Tertiary |
| Materials | Type of material |
|---|---|
| Bornite | Ore |
| Chalcocite | Ore |
| Chalcopyrite | Ore |
| Covellite | Ore |
| Cuprite | Ore |
| Digenite | Ore |
| Gold | Ore |
| Molybdenite | Ore |
| Pyrite | Ore |
| Albite | Gangue |
| Calcite | Gangue |
| Chlorite | Gangue |
| Epidote | Gangue |
| Feldspar | Gangue |
| Quartz | Gangue |
| Sericite | Gangue |
| Result | 0.6% CU |
|---|
| Model code | 53 |
|---|---|
| USGS model code | 17 |
| Deposit model name | Porphyry Cu |
| Mark3 model number | 4 |
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Diorite | ||||
| |||||
| Host or associated | Associated |
|---|---|
| Rock type | Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase |
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite |
| (1) | -113.38544, 28.05579 |
|---|
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Large |
| Significant | No |
| Discovery year | 1968 |
| District name | Calmalli |
|---|
| Type | Owner |
|---|---|
| Owner | Industria Minera Mexico, S. A. |
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1978 | ||||||||||||||
| Total resources | 6000000mt ore | ||||||||||||||
| |||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | MX00099 |
PANCZNER, WILLIAM D., 1987, MINERALS OF MEXICO: VAN NOSTRAND REINHOLD COMPANY, NEW YORK, 459 P.
SALAS, G.P., 1975, CARTA Y PROVINCIAS METALOGENETICAS DE LA REPUBLICA MEXICANA: CONSEJO DE RECURSOS MINERALES PUBLICACION 21 E, P. 186.
ECHAVARRI P., A., Y RANGIN, C., 1978, EL YACIMIENTO CUPRIFERO DEL ARCO, BAJA CALIFORNIA, SU AMBIENTE GEOLOGICO Y SUS CARACTERISTICAS DE ALTERACION Y MINERALIZACION: UNIVERSIDAD DE SONORA, BOLETIN DEL DEPARTMENTO DE GEOLOGIA, V. 1, NUM. 1, OCT. 1978, P. 1-18.
COX, D.P., AND SINGER, D.A., 1986, MINERAL DEPOSIT MODELS: USGS BULLETIN 1693, 379 P.
| Subject category | Comment text |
|---|---|
| Deposit | METAMORPHOSED PORPHYRY COPPER DEPOSIT. PRIMARY MINERALIZATION CONSISTS OF PYRITE, CHALCOPYRITE, BORNITE, MOLYBDENITE, MINOR MAGNETITE AND GOLD DISSEMINATED IN FRACTURES AND IN QUARTZ-KSPAR-CALCITE-CHLORITE-EPIDOTE VEINLETS (A3 MM WIDE). PYRITE:CHALCOPYRITE RATIO 1.3 TO 1 IN CENTRAL CORE, WITH INTERNAL SUBZONES OF 0.5 TO 1. GRADES OUTWARD TO 14:1 IN PYRITIC HALO SURROUNDING QMP INTRUSIVE. CAPPED BY GOETHITE LAYER AVERAGING 40 M THICK (MAX. 60 M). OXIDATION MINERALS: CHRYSOCOLLA, GOETHITE, HEMATITE, CLAY MINERALS, NEOTOCITE, DIOPTASE, AND MALACHITE. HIGH-GRADE TRANSITION ZONE 9 M THICK BELOW OXIDE ZONE CONTAINS BORNITE, CHALCOCITE, COVELLITE, DIGENITE, CUPRITE, AND NATIVE CU. LIMITED DISTRIBUTION OF GOLD. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-JUL-1987 | Staude, John-Mark G. (Page, Norman J.) | U.S. Geological Survey | |
| Updater | 01-JUN-1988 | Leonard, Kenneth R. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.