Alpine Mine, Stevens Peak, Hope Valley Mining District, Alpine County, California, USAi
| Regional Level Types | |
|---|---|
| Alpine Mine | Mine |
| Stevens Peak | Peak |
| Hope Valley Mining District | Mining District |
| Alpine County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 43' 60'' North , 119° 58' 0'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Kirkwood | 158 (2011) | 9.8km |
| Alpine Village | 114 (2011) | 13.6km |
| Markleeville | 210 (2014) | 16.6km |
| Mesa Vista | 200 (2011) | 16.9km |
| South Lake Tahoe | 21,706 (2017) | 22.3km |
A former Mo-W-Fe mine located in the NW¼ (950S 2100E from NW corner) sec. 11, T10N, R18E, MDM, 1.4 km (4,600 feet) E of Stevens Peak, N of Crater Lake (1 mile W of state highway 88), on National Forest land. Produced during 1943. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a contact metamorphic deposit hosted in tactite skarn (hornfels). The ore body is tabular at a width of 12.19 meters. The deposit lies within a contact zone between granitic rocks on the W, and a roof pendent of schist and hornfels on the E. Local rocks include pre-Cenozoic metasedimentary and metavolcanic rocks undivided.
NOTE: A real geology of the vicinity of the mine is found in Geological Society of America Bulletin (1961), vol. 72(12): Pl. 2. The surface at the mine is skarn near a granodiorite-metssediment contact. This report makes it seem improbable that the mine extends into sec. 2.
NOTE: Regarding the references of Frondel & Wickman and Pemberton, p. 79: The data relate to a study of molybdenite polytypes and cite U.S.N.M. specimen 9.1868 Lake Tahoe, California. The article states "Contact metamorphic occurrences of molybdenite are known from this region. This specimen is probably from the Alpine Mine, south of Lake Tahoe, where molybdenite occurs together with powellite and scheelite in tactite (King 1966). Thus, those references and related data are incorporated into this file.
Workings include underground openings comprised of 2 W-trending crosscut adits several hundred feet long and 100 feet apart vertically, plus 1,000 feet of drifts.
Production information: 306 tons of ore were mined.
Analytical data results: 1% - 0.6% WO3.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ 'Molybdenite-2H' Formula: MoS2 References: Frondel, Judith W., Wickman, Frans E. (1970) Molybdenite polytypes in theory and occurrence: II. Some naturally-occurring polytypes of molybdenite. American Mineralogist, 55 (11-12) 1857-1875 |
| ⓘ Powellite Formula: Ca(MoO4) |
| ⓘ Scheelite Formula: Ca(WO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Powellite | 7.GA.05 | Ca(MoO4) |
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
| Unclassified | |||
| ⓘ | 'Molybdenite-2H' | - | MoS2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Powellite | Ca(MoO4) |
| O | ⓘ Scheelite | Ca(WO4) |
| S | Sulfur | |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Molybdenite-2H | MoS2 |
| Ca | Calcium | |
| Ca | ⓘ Powellite | Ca(MoO4) |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Mo | ⓘ Powellite | Ca(MoO4) |
| Mo | ⓘ Molybdenite-2H | MoS2 |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
Other Databases
| Link to USGS MRDS: | 10008302 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Shoofly-Olds Ferry DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060030003
Frondel, Judith W., Wickman, Frans E. (1970) Molybdenite polytypes in theory and occurrence: II. Some naturally-occurring polytypes of molybdenite. American Mineralogist, 55 (11-12) 1857-1875
Clark, William B. (1977) Mines and Mineral Resources of Alpine County, California. County Report 8. California Division of Mines and Geology pp.39-41
