Unnamed Occurrence (ARDF - GO004; northwest of Rainbow Basin), Bristol Bay Region District, Dillingham Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - GO004; northwest of Rainbow Basin) | - not defined - |
| Bristol Bay Region District | - not defined - |
| Dillingham Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
59° 43' 11'' North , 159° 7' 48'' West
Latitude & Longitude (decimal):
Köppen climate type:
This occurrence is in Wood-Tikchik State Park.
Location: Rainbow Basin is a lowland between the drainage at the head of Amakuk Arm of Lake Nerka to the west and the Golden Horn segment of Lake Beverly to the east. This approximately located occurrence is in the uplands on the north side of Rainbow Basin. The map site is on an unnamed creek at an elevation of about 700 feet, in the NW1/4 of section 27, T 5 S, R 58 W, of the Seward Meridian. It is area 1 of Kilburn and others (1992). The location possibly is accurate within a mile.
Geology: A highly oxidized, Cretaceous or Tertiary granitic stock surrounded by iron-stained argillite hornfels underlies the headwaters of a stream draining south to Rainbow Basin. The occurrence described in this record is about 2 miles northwest of Rainbow Basin (Kilburn and others, 1992). It consits of hornfels that contains disseminated sulfides and is cut by arsenopyrite- and pyrite-bearing quartz veins and stockworks. Individual veins are up to 1/4 inch thick. Thin felsic dikes cut the mineralized veins in places. Float samples of hornfels, silicified hornfels, and sulfide-bearing veinlets collected at the head of the drainage contain up to 1.1 ppm Ag, greater than 3,800 ppm As, 1.35 ppm Au, 400 ppm Bi, 780 ppm Cu, 21 ppm Mo, 303 ppm Ni, 64 ppm Sb, and 20 ppm Sn (Kilburn and others, 1992).
Workings: Reconnaissance geochemical sampling has been completed in the area.
Age: Probably Late Cretaceous or Early Tertiary. Mineralization is probably related to the granitic plutons in the area, which are inferred to be part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).
Alteration: Silicification and oxidation.
Commodities (Major) - Mo?; (Minor) - Au?
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c)
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| 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 | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrite | FeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | GO004 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Koyukuk ArcsVolcanic Arc
- Walrus-Togiak DomainDomain
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