Unnamed Occurrence (ARDF - SB018; western Mitrofania Island), Lake and Peninsula Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SB018; western Mitrofania Island) | - not defined - |
| Lake and Peninsula Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
55° 50' 52'' North , 158° 52' 47'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Perryville | 113 (2015) | 18.0km |
This site is located on land selected by the Bristol Bay Native Corporation.
Location: This site is located on the west shore of Mitrofania Island, 0.6 mile west-northwest of the top of hill 1660. It is referred to as SBRGX-44 in Wilson and others (1988, locality 18). The location is accurate to within 2,500 feet.
Geology: This occurrence is in an area mapped as undivided Tertiary volcanic rocks (Wilson and others, 1995). Small plutons of Miocene or Pliocene granodiorite to quartz diorite crop out a few miles to the north and south of the occurrence (Wilson and others, 1995). At this site, fractured and silicified volcanic flows are cut by numerous quartz-calcite veinlets as much as 2 inches thick, which fill the fracture zones (Wilson and others, 1988). Some veinlets carry as much as 80 to 90 percent pyrite and other, unidentified, sulfides. Rock samples collected by the U.S. Geological Survey contained 10 ppm or less gold, and as much as 500 ppm antimony, 26,000 ppm arsenic, 1,500 ppm copper, 300 ppm lead, 50 ppm silver, and 10,000 ppm or more zinc (Angeloni and others, 1985; Wilson and others, 1988). Bismuth is also reported in some of the analyses.
Workings: Rock samples 84AGe10-16 collected by the U.S. Geological Survey in the mid-1980's, contained 10 ppm or less gold, and as much as 500 ppm antimony, 26,000 ppm arsenic, 1,500 ppm copper, 300 ppm lead, 50 ppm silver, and greater than 10,000 ppm zinc (Angeloni and others, 1985; Wilson and others, 1988). Bismuth is also reported in some of the analyses.
Age: Tertiary.
Alteration: Silicification.
Commodities (Major) - Ag, Au, Pb, Zn; (Minor) - As, Bi, Cu, Sb
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c).
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 | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| 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 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | SB018 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
- East Aleutian ArcVolcanic Arc
Pacific OceanOcean
USA
- Alaska
- Alaska Peninsula Mining DistrictMining District
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