Keystone Mine, Willard Mining District, Pershing County, Nevada, USAi
| Regional Level Types | |
|---|---|
| Keystone Mine | Mine |
| Willard Mining District | Mining District |
| Pershing County | County |
| Nevada | State |
| USA | Country |
Keystone Mine, Willard Mining District, Mill City Mining District, Nevada, USA
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Latitude & Longitude (WGS84):
40° 50' 29'' North , 118° 7' 5'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Sec 1-12 T34N R34E. Silver-lead-copper mine.
Note: Coordinates deleted because obviously wrong.
Deposit type: Low-sulfide Au-quartz vein
Structure: Gently Dipping Shear Zones
Alteration:
Sericitization, Silicification, Kaolinization, Pyritization
Commodity: Scheelite was found in drill core of granodiorite for 22 ft along the core from a depth of 135 ft down.
Deposit: Ore zone varies from 2 to 6 ft in width. The mines are in granodiorite that cuts shale of Triassic age. Western (new) shaft sunk on n-s trending white quartz vein in shale; wallrock is moderately silicified, laced wit-h quartz-sulfide veinlets. At the old shaft to the NE, a N30E,-40 SE quartz vein occupies a shear zone in kaolinized granodiorite. Vein is 1-2 ft wide, iron and manganese oxide-stained. Vein contains galena, sphalerite, tetrahedrite in white quartz gangue. Parallel quartz veins cut both granodiorite and shale; granodiorite is generally kaolinized and laced with quartz veinlets. Some quartz on the dump displays pale green staining. S-hear zone is 200-300 ft wide and both old and new shafts are within it. Vein system seems to be stronger where it cuts granodiorite. To the NE at sample site 2656, old pits, shafts, cuts expose a series of N60-70 W NE-dipping quartz veins which cut hornfels and shale. The veins are 4-15 ft thick, are brecciated, and are iron-oxide stained on outcrop. Vein material on some of the dumps contains pods of massive pyrite. The hornfels wallrocks are bleached, kaolinized and contain disseminated pyrite. Vein material contains sphalerite, galena, some tetrahedrite and stibnite; model name could also be: polymetallic veins. Located in 1872, no development until 1937 when acquired by Nevada Keystone Co. Mine workings are in an area of shales and limestones which have been intruded by granodiorite dike. The Keystone mines are located in the granodiorite which cuts the shales of Triassic age. The Keystone mines were worked intermittently to 1966. info.src : 1 pub lit; 2 unpub rept; 3 field observ
The Keystone mines must have been worked in the 1870-1880's, evidence of old buildings can be seen in the wash east of the old shaft. Remains of an old horse whim can be seen at the northeastern workings.
Note: Coordinates deleted because obviously wrong.
Deposit type: Low-sulfide Au-quartz vein
Structure: Gently Dipping Shear Zones
Alteration:
Sericitization, Silicification, Kaolinization, Pyritization
Commodity: Scheelite was found in drill core of granodiorite for 22 ft along the core from a depth of 135 ft down.
Deposit: Ore zone varies from 2 to 6 ft in width. The mines are in granodiorite that cuts shale of Triassic age. Western (new) shaft sunk on n-s trending white quartz vein in shale; wallrock is moderately silicified, laced wit-h quartz-sulfide veinlets. At the old shaft to the NE, a N30E,-40 SE quartz vein occupies a shear zone in kaolinized granodiorite. Vein is 1-2 ft wide, iron and manganese oxide-stained. Vein contains galena, sphalerite, tetrahedrite in white quartz gangue. Parallel quartz veins cut both granodiorite and shale; granodiorite is generally kaolinized and laced with quartz veinlets. Some quartz on the dump displays pale green staining. S-hear zone is 200-300 ft wide and both old and new shafts are within it. Vein system seems to be stronger where it cuts granodiorite. To the NE at sample site 2656, old pits, shafts, cuts expose a series of N60-70 W NE-dipping quartz veins which cut hornfels and shale. The veins are 4-15 ft thick, are brecciated, and are iron-oxide stained on outcrop. Vein material on some of the dumps contains pods of massive pyrite. The hornfels wallrocks are bleached, kaolinized and contain disseminated pyrite. Vein material contains sphalerite, galena, some tetrahedrite and stibnite; model name could also be: polymetallic veins. Located in 1872, no development until 1937 when acquired by Nevada Keystone Co. Mine workings are in an area of shales and limestones which have been intruded by granodiorite dike. The Keystone mines are located in the granodiorite which cuts the shales of Triassic age. The Keystone mines were worked intermittently to 1966. info.src : 1 pub lit; 2 unpub rept; 3 field observ
The Keystone mines must have been worked in the 1870-1880's, evidence of old buildings can be seen in the wash east of the old shaft. Remains of an old horse whim can be seen at the northeastern workings.
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
7 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Galena Formula: PbS |
| ⓘ Native Silver Formula: Ag |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 Description: Inclusions of wire silver. |
| ⓘ Scheelite Formula: Ca(WO4) |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Stibnite Formula: Sb2S3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Scheelite | Ca(WO4) |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Stibnite | Sb2S3 |
| Ca | Calcium | |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Ag | Silver | |
| Ag | ⓘ Native Silver | Ag |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10042501 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Auld Lang Syne BasinBasin
- Basin and Range BasinsBasin
- Golconda-Roberts Mountain DomainDomain
- Havallah BasinBasin
- West Nevada Permian-Triassic BasinBasin
USA
- Lake LahontanLake
- Nevada
- Mill City Mining DistrictMining District
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