Star Pointer Mine, Old Baldy Mining District, Pima County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Star Pointer Mine | Mine |
| Old Baldy Mining District | Mining District |
| Pima County | County |
| Arizona | State |
| USA | Country |
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Latitude & Longitude (WGS84):
31° 46' 19'' North , 110° 51' 15'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Green Valley | 21,391 (2011) | 16.0km |
| Arivaca Junction | 1,090 (2011) | 20.2km |
| East Sahuarita | 1,622 (2006) | 20.2km |
| Amado | 295 (2011) | 21.1km |
| Sonoita | 818 (2015) | 21.3km |
‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 168, 170.
Drewes, H.D. (1971) Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-613, 1 sheet, scale 1:48,000.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10039504, MRDS ID #M050178; and, Dep. ID #10161735, MAS ID #0040190563.
A former small underground Cu mine located in sec. 19, T19S, R15E, about 1/3 mile ESE of McCleary Camp, north of Stone Cabin Canyon, and 30 iles S of Tucson on open ground. Discovered 1915.
Mineralization is a replacement deposit hosted in the Mount Wrightson Formation. Country rock is rhyolite which is agglomeratic or brecciated. It is on a 14 foot lode of silicified rhyolite and quartz which extends from the surface down and contains copper sulfides and carbonates in irregular bodies. The ore strikes N45W and dips 80N. Much of the ore has been formed by enrichment and replacement in the rhyolite. A 2 to 6 inch (5 to 15 cm) pay streak, consisting principally of chalcocite and other copper ore minerals, is reported to occur on either wall from a depth of 65 feet below the surface, or ground water level, to the bottom of the shaft. The deposit belongs to the late Tertiary period of metalliztion. Ore control was a porous breccia zone. Alteration was propylitic; pyrite-chalcopyrite-gossan.
Local structures include thrust and normal faulting, fracture zones, homoclinal. Regional trends include tilting and broad open folds in the south and extensive faulting in the north.
Workings include a 100 foot deep shaft that is inclined 85ºSW. No production record.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Chalcocite Formula: Cu2S Description: Shown microscopically to occur in irregular forked and reticulated bodies, following fractures and small replacement chambers and cracks in the siliceous gangue. |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Hematite Formula: Fe2O3 Description: Closely associated with chalcocite in places. |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Quartz Formula: SiO2 Description: Mostly crystalline and occurs in fine to medium crystals and grains. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcocite | Cu2S |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Hematite | Fe2O3 |
| Cu | Copper | |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS MRDS: | 10039504 |
|---|
Other Regions, Features and Areas containing this locality
Mexico
- Sierra Madre OccidentalMountain Range
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mazatzal DomainDomain
- Southern Basin and RangeWide Rift
USA
- Arizona
- Santa Rita MountainsMountain Range
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Star Pointer Mine, Old Baldy Mining District, Pima County, Arizona, USA