Keystone Mine (Keystone claim; Goat claim), Slumgullion Pass, Castle Dome Mining District, Castle Dome Mountains, Yuma County, Arizona, USAi
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Latitude & Longitude (WGS84):
33° 2' 37'' North , 114° 1' 4'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Tacna | 602 (2011) | 38.9km |
| Wellton | 2,936 (2017) | 42.9km |
| Dateland | 416 (2011) | 52.3km |
| Buckshot | 153 (2017) | 55.0km |
| Fortuna Foothills | 26,265 (2011) | 56.5km |
A former underground Ag-Cu-Mn-Zn mine located in secs. 28 & 33, T4S, R17W, in the SE portion of the Castle Dome Mountains, on federal land.
The deposit is on the SE slope of a bold ridge of quartz-sericite schist that is capped by eastward-dipping Tertiary rhyolite flows. Quartz porphyry dikes up to 15 or more feet wide cut these rocks in various directions but predominantly strike SW. The ore zone is 228.6 meters long and 336.19 meters wide, strikes N15W and dips 56W.
Mineralization includes the principal vein 1 to 3 foot wide at outcrop, in a brecciated zone in the rhyolite, strikes N.15ºW. & dips 56ºW. It is traceable northward for some 750 feet beyond which it narrows to 1 foot or less and swings NW-ward, continuing for a long distance as a dark gray quartz-carbonate streak. Vein filling is manganoan calcite intermingled with brecciated quartz and rhyolite. Quartz is fine-grained & cellular. Mineralization includes manganese dioxide.
Workings include a few shallow prospect workings which revealed pockets of rich silver ore close to the surface. No production record.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Calcite var. Manganese-bearing Calcite Formula: (Ca,Mn)CO3 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 Description: A few spots in/on quartz. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 5 - Nitrates and Carbonates | |||
|---|---|---|---|
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | var. Manganese-bearing Calcite | 5.AB.05 | (Ca,Mn)CO3 |
| ⓘ | 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 | ⓘ Calcite | CaCO3 |
| C | ⓘ Calcite var. Manganese-bearing Calcite | (Ca,Mn)CO3 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Calcite var. Manganese-bearing Calcite | (Ca,Mn)CO3 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Calcite var. Manganese-bearing Calcite | (Ca,Mn)CO3 |
| Mn | Manganese | |
| Mn | ⓘ Calcite var. Manganese-bearing Calcite | (Ca,Mn)CO3 |
| Cu | Copper | |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS MRDS: | 10102435 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Southern Basin and RangeWide Rift
USA
- Arizona
- Kofa National Wildlife RefugeWildlife Refuge
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