Unnamed Occurrence (ARDF - TY024; near Skwentna River), Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - TY024; near Skwentna River) | - not defined - |
| Yentna Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 57' 36'' North , 152° 18' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
The basic reference was published in 1900; no more recent information is available.
Location: The location of this occurrence is approximated from Spurr (1900, p. 110-112, June 24 campsite; U.S. Bureau of Mines, 1998, MAS # 0020840014; MacKevett and Holloway, 1977, p. 76, locality 4; and Cobb, 1972, MF 385, locality 5) in Section 25, T. 22 N., R. 17 W. One of the reporters (Millholland) was unable to located the occurrence in the field using the localites cited above.
Geology: Folded volcanic rocks are cut by granitic dioritic and syenitic dikes. Rock along contacts between dikes and volcanics are decomposed and iron stained (Spurr,1900, p. 110-112). Narrow quartz veins up to several inches wide are rich in pyrite, chalcopyrite and galena. Other zones near, but not at, contacts generally follow stratification, are similarly mineralized and contain gold and silver. Upstream, black slate is cut by granitic dikes; quartz veins carry pyrite, chalcopyrite and galena. Assay of sample with pyrite and chalcopyrite assayed 0.05 oz/ton gold and 0.15 oz/ton silver. Assay of a quartz vein sample returned 0.1 oz/ton gold and 0.25 oz/ton silver (Spurr, 1900, p.259). The basic reference was published in 1900; no more recent information is available.
Workings: Prospecting, rock sample assayed.
Commodities (Major) - Ag, Au, Cu, Pb
Development Status: No
Deposit Model: Hydrothermal/contact metamorphic?, polymetallic vein?, disseminated?(MacKevett
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:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | TY024 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Peninsular TerraneVolcanic Arc
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