Lone Mountain Occurrence, Bristol Bay Region District, Dillingham Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Lone Mountain Occurrence | Occurrence |
| Bristol Bay Region District | - not defined - |
| Dillingham Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
59° 21' 36'' North , 160° 13' 48'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Togiak | 842 (2017) | 34.2km |
Location: Lone Mountain is an upland between Gechiak Creek and another (unnamed) west tributary to the Togiak River. This occurrence is assumed to be on the east side of Lone Mountain, in the larger drainage that flows east to Togiak River. For this record, the map site is at an elevation of 1,300 feet on the north flank of Lone Mountain, in the SE1/4 of section 28, T 9 S, R 65 W, of the Seward Meridian. This occurrence is area 2 of Kilburn and others (1992). It is approximately located, perhaps within a mile.
Geology: Lone Mountain is centered on a Cretaceous or Tertiary felsic stock surrounded by hornfels (Hoare and Coonrad, 1978). The iron-stained hornfels, which is locally gossan, contains disseminated pyrite and small quartz-pyrite veinlets. Quartz veinlets are also locally present in iron-stained parts of the stock near the contact zone. Stream-sediment samples from the area contain anomalous amounts of As, Bi, Cu, Pb, Mo, W, or Zn (Cieutat and others, 1988; Hessin and others, 1978 [OF 78-9-Q; OF 78-9-M]). Hornfels and veinlet samples collected near the eastern contact mostly contain anomalous amounts of copper (up to 900 ppm Cu) and up to 1.2 ppm Ag, 0.01 ppm Au, 26 ppm Bi, 7.2 ppm Mo, 30 ppm Sn, and 50 ppm W (Kilburn and others, 1992). One iron-stained, carbonate-cemented breccia contained 460 ppm As, 0.15 ppm Au, 1.9 ppm Hg, and 11 ppm Sb.
Workings: Reconnaissance geochemical sampling has been completed in the area (Cieutat and others, 1988; Hessin and others, 1978 [OF 78-9-Q; OF 78-9-M]).
Age: Probably Late Cretaceous or Early Tertiary. Mineralization is probably related to the granitic pluton in the area, which is part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).
Alteration: Silicification and oxidation.
Commodities (Major) - Cu; (Minor) - Ag, Au, W
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
2 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 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | GO013 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Koyukuk ArcsVolcanic Arc
- Walrus-Togiak DomainDomain
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