Pyrrhotite Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Pyrrhotite Prospect | Prospect |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 17' 13'' North , 153° 46' 40'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
See Post Lake Prospect (MG069).
Location: The Pyrrhotite prospect is located on a steep, precipitous southerly flank of Peak 6,920 at the head of Sheep Creek. It is about 1.5 kilometers southwest of the Badnews Prospect (MG061)) at an elevation of 5,750 feet (1,753 m) in the NW1/4 sec. 5, T. 25 N., R. 24 W., of the Seward Meridian. The reporter investigated the site in 1982.
Geology: The Pyrrhotite occurrence consists of several semi-massive to massive pods of pyrrhotite and minor pyrite enclosed in banded hornfels and marble adjacent to a small stock of highly altered granodiorite porphyry. The host rocks are thermally altered marble and clastic sediments of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen and others, 1997). Pyrrhotite occurs as disseminated grains in veinlets up to 8 centimeters thick, as semimassive to massive sulfide pods up to 30 centimeters thick, and as clots and crystals up to three centimeters across. Grab samples of pyrrhotite-rich sulfide mineralization collected during investigations by Anaconda Minerals Company contained up to 0.44 percent nickel and 460 ppm cobalt (Brewer and others, 1992). Selected samples reported by Foley (1987) contain up to 180 ppm nickel, 180 ppm copper, and 180 ppm zinc. Massive pyrrhotite-bearing samples contained 58.00 percent iron.
Workings: The Pyrrhotite occurrence was noted by the reporter during mapping conducted in 1981 (Bundtzen, Kline, and Clough, 1982). Grab samples of pyrrhotite-rich sulfide mineralization collected by Anaconda Minerals Company contained up to 0.44 percent nickel and 460 ppm cobalt (Brewer and others, 1992). Selected samples reported by Foley (1987) contain to 180 ppm nickel, 180 ppm copper, and 180 ppm zinc. Massive pyrrhotite-bearing samples contained up to 58.00 percent iron.
Alteration: None.
Reserves: None.
Commodities (Major) - Co, Cu, Fe, Ni; (Minor) - Zn
Development Status: No
Deposit Model: Polymetallic replacement (?) (Cox and Singer, 1986; model 19a).
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
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
Other Databases
| Link to USGS - Alaska: | MG062 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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