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Colbert; Big Chief; Pearl; Triangle Prospect, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Colbert; Big Chief; Pearl; Triangle Prospect | Prospect |
| Fairbanks Mining District | Mining District |
| Fairbanks North Star Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 58' 51'' North , 147° 21' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fox | 417 (2011) | 12.4km |
| Farmers Loop | 4,853 (2017) | 17.8km |
| Two Rivers | 719 (2011) | 19.4km |
| Badger | 19,482 (2011) | 21.7km |
| Fairbanks | 32,325 (2017) | 23.1km |
Location: The Colbert prospect is located in the SW1/4SW1/4 sec. 21, T. 2 N., R. 2 E., Fairbanks Meridian. The Colbert deposit is located at the top of Gilmore Dome. The prospect is included in locality 32 of Cobb (1972 [MF 410]).
Geology: The Colbert tungsten deposit consists of scheelite in and parallel to metasedimentary rocks that are intruded by porphyritic granite (Thorne and others, 1948, p. 4). Small amounts of scheelite are also disseminated in the granite. The ore lenses occupy parts of a 30-foot-thick calcareous bed in schist. The lode has been traced for approximately 2,000 feet; it varies in thickness. The mineralization pinches out in some places, but a zone as much as 50 feet wide was observed in one trench (Byers, 1957). The tungsten content of the ore shoots is 1.3 percent tungsten tri-oxide over an average width of 1.6 feet (Byers, 1957). This tungsten deposit is 1,000 feet south of and parallel to the Stepovich lode (FB113) (Berg and Cobb, 1967, p. 220).
Workings: This prospect has been explored by trenches (Byers, 1957).
Commodities (Major) - W
Development Status: None
Deposit Model: W skarn deposit (Cox and Singer, 1986; model 14a)
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
|---|---|---|---|
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Scheelite | Ca(WO4) |
| Ca | Calcium | |
| Ca | ⓘ Scheelite | Ca(WO4) |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
Other Databases
| Link to USGS - Alaska: | FB114 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- North America PlatformPassive Margin
- Yukon-Tanana lower DomainDomain
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