Commodore Mine (Golden Gate Mine), San Andreas, San Andreas Mining District, Calaveras County, California, USAi
| Regional Level Types | |
|---|---|
| Commodore Mine (Golden Gate Mine) | Mine |
| San Andreas | - not defined - |
| San Andreas Mining District | Mining District |
| Calaveras County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 12' 36'' North , 120° 41' 52'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| San Andreas | 2,783 (2011) | 2.2km |
| Mokelumne Hill | 646 (2011) | 10.1km |
| Valley Springs | 3,553 (2011) | 11.7km |
| Mountain Ranch | 1,628 (2011) | 13.9km |
| Rancho Calaveras | 4,489 (2018) | 16.8km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Calaveras Gem & Mineral Society | Angels Camp, California | 21km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 22km |
Mindat Locality ID:
75072
Long-form identifier:
mindat:1:2:75072:8
GUID (UUID V4):
521d10a7-4ab1-4051-a0ce-b7fcbc6d07fc
A former lode Au mine located in the SWΒΌ sec. 7, T4N, R12E, MDM, 2.2 km (7,300 feet/1.3 miles) NW of San Andreas at Carson Hill. Operated during the periods 1899 to October 1900, and July 1933 to September, 1934. MRDS database stated accuracy for this location is 500 meters.
Mineralization is hosted in quartz diorite. The Commodore East vein was reported as a quartz diorite intrusive. A section from W to E gives: amphibolite schist, ankerite, a quartz vein, a wide body of ankerite, and serpentine, a mineralized quartz diorite intrusion which is the Commodore vein, serpentine and diabase. A 4 foot thick zone of crushed material from which rhombic crystals of dolomite contained visible gold particles, is on the hanging wall side of the quartz diorite. Local rocks include Paleozoic metavolcanic rocks, unit 4 (Western Sierra Nevada Foothills) and/or Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).
Workings include underground openings comprised of a 300 foot deep shaft with several levels (80, 200 & 300 feet), drifts and crosscuts, which include a 450 foot adit, 80, 200 & 300 . The working shaft is vertical for the first 80 feet, thereafter the remainder is at an incline of 75 degrees.
Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).
Production data: $7 (period values) per ton ore encountered to the N at 300 foot level. No production record found.
Analytical data results: Ore averaged $4 (period values) per ton Au (mill test - 1900).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| β Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
| β Dolomite Formula: CaMg(CO3)2 |
| β Gold Formula: Au |
| β Muscovite Formula: KAl2(AlSi3O10)(OH)2 Description: Occurs in schist. |
| β Muscovite var. Mariposite Formula: K(Al,Cr)2(Al,Si)4O10(OH)2 Description: Occurs in schist. |
| β Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 Description: Occurs in schist. |
| β Quartz Formula: SiO2 |
| β 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| β | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 9 - Silicates | |||
| β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| β | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| β | var. Mariposite | 9.EC.15 | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Unclassified | |||
| β | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| H | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| H | β Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| C | β Dolomite | CaMg(CO3)2 |
| O | Oxygen | |
| O | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | β Dolomite | CaMg(CO3)2 |
| O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| O | β Quartz | SiO2 |
| O | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| O | β Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mg | β Dolomite | CaMg(CO3)2 |
| Mg | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | Aluminium | |
| Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Si | Silicon | |
| Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Si | β Quartz | SiO2 |
| Si | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Si | β Serpentine Subgroup | D3[Si2O5](OH)4 |
| K | Potassium | |
| K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| K | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Ca | Calcium | |
| Ca | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Ca | β Dolomite | CaMg(CO3)2 |
| Cr | Chromium | |
| Cr | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Fe | Iron | |
| Fe | β Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Au | Gold | |
| Au | β Gold | Au |
Other Databases
| Link to USGS MRDS: | 10102657 |
|---|
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References
