Union Cordova & Rathger Mine (Union Gold Mine; Union Cordova Mine), Kentucky House, San Andreas Mining District, Calaveras County, California, USAi
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Latitude & Longitude (WGS84):
38° 9' 23'' North , 120° 39' 19'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| San Andreas | 2,783 (2011) | 4.9km |
| Mountain Ranch | 1,628 (2011) | 12.8km |
| Angels Camp | 2,677 (2012) | 14.1km |
| Valley Springs | 3,553 (2011) | 15.7km |
| Mokelumne Hill | 646 (2011) | 16.6km |
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 | 14km |
| Amador County Gem & Mineral Society | Sutter Creek, California | 29km |
Mindat Locality ID:
76039
Long-form identifier:
mindat:1:2:76039:0
GUID (UUID V4):
495bd1fa-3aee-47f2-ae94-29c646b649a5
A former lode Au-Ag-U mine located in the E½ sec. 33, T4N, R12E, MDM, 1.7 km (1.1 miles) ESE of Kentucky House, W of highway 49 (2½ miles SSE of San Andreas). MRDS database stated accuracy for this location is 100 meters.
Mineralization is a vein & pocket deposit hosted in amphibolite, schist and slate. The ore body strikes N30W and dips 70NE. The Union ledge matter, of quartz and schist, is 30 feet thick at the 120 level and thickens with depth. Black, acicular crystals of uraninite, with yellow uranium oxide, were associated in the quartz and with the gold. The Rathger vein, ½ mile NE, strikes N and dips 70E at 1 to 6 feet thick. It has a thick black slate hanging wall and an amphibolite schist footwall. Local rocks include undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided).
Workings include underground openings. The Union has a 455 foot inclined shaft with levels at 120, 160, 220, 350 & 430 feet, plus 3 other shallow shafts. The Rathger has a 220 foot shaft with levels at 120 and 200 feet.
Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).
Total output of these properties is unknown. It was reported that the Rathgers recovered $175,000 (period values) from above the 120 level of the Union Mine. In 1954 the Uravan Uranium and Oil Company of Salt Lake City, Utah, leased the property to explore for uranium. The Union shaft was cleaned out to a depth of 150 feet but no U was found.
The fineness of the bullion produced was 0.929 Au and 0.061 Ag.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
5 valid minerals.
Detailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Uraninite Formula: UO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Uraninite | 4.DL.05 | UO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Uraninite | UO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| U | Uranium | |
| U | ⓘ Uraninite | UO2 |
Other Databases
| Link to USGS MRDS: | 10028902 |
|---|
Other Regions, Features and Areas containing this locality
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060090022
