Morning Glory Mine, Alleghany, Alleghany Mining District (Forest Mining District), Sierra County, California, USAi
| Regional Level Types | |
|---|---|
| Morning Glory Mine | Mine |
| Alleghany | - not defined - |
| Alleghany Mining District (Forest Mining District) | Mining District |
| Sierra County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 28' 4'' North , 120° 50' 18'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Downieville | 282 (2011) | 10.2km |
| Washington | 185 (2011) | 12.5km |
| Pike | 134 (2011) | 14.1km |
| Camptonville | 158 (2011) | 18.1km |
| Sierra City | 221 (2011) | 20.6km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 34km |
A former lode Au occurrence/mine located in the S½ & SW¼ sec. 34, T19N, R10E, MDM, 0.5 km (0.3 mile) ESE of Alleghany, on National Forest land. MRDS database stated accuracy for this location is 100 meters.
Mineralization is a vein deposit hosted in amphibolite and Late Permian schist. The ore body strikes N40W and dips 45NE at a thickness of 2.13 meters. The deposit is an irregular, 1 to 7 foot thick quartz vein, where continuous, 1 to 3 feet, within massive amphibolite schist, probably continuous with branch of the Eclipse vein. Strike in the productive upper levels is N20-60W and the dip is 30-60NE. It may follow the same normal fault as the Ophir vein. There are several small thrust faults, none displacing the vein more than 10 feet. At the lowest level there is a sharp change in strike that seems due to pre-mineralization faulting of a NW fissure by a N fissure. There are 2 types of post-mineralization faults: 1.) Sub-parallel to, but crossing the vein; and, 2.) Steeply, usually with dipping, northerly striking fissures. Mostly only a few feet, but one, which may be the same the Sixteen-to-One, may displace the vein as much as 250 feet. There is little mariposite. Brecciated, re-cemented quartz was observed along the hanging wall associated with high-grade ore & small faults, with quartz but not arsenopyrite. Pyritized schist occurs in the productive part of the vein. High-grade ore occurs mostly in small bunches. Local rocks include undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided).
Workings include underground openings with an overall depth of 60.96 meters and comprised of a drift adit, an inclined shaft 380 feet on the dip of the vein, totaling 2,500 feet of workings.
Production data are found in: McCulloch, W.C., Oesterling, W.A., Spurck, W.H., & Tischler, M.S. (1964).
Total production was between $90,000 & 100,000 (period values). Ferguson estimated $27 to $32 (period values) of Au per vein foot.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Description: Little occurs here. |
| ⓘ Muscovite var. Mariposite Formula: K(Al,Cr)2(Al,Si)4O10(OH)2 Description: Little occurs here. |
| ⓘ Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 Description: Little occurs here. |
| ⓘ Native Gold Formula: Au Description: Rich material occurs in bunches. |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native 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 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| ⓘ | var. Mariposite | 9.EC.15 | K(Al,Cr)2(Al,Si)4O10(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| H | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| O | Oxygen | |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Al | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| K | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Cr | Chromium | |
| Cr | ⓘ Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Fe | ⓘ Pyrite | FeS2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10077656 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker 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 #0060910251
