Colbert and Warmbold Occurrence, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Colbert and Warmbold Occurrence | Occurrence |
| Fairbanks Mining District | Mining District |
| Fairbanks North Star Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 3' 21'' North , 147° 24' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fox | 417 (2011) | 14.6km |
| Farmers Loop | 4,853 (2017) | 21.3km |
| Two Rivers | 719 (2011) | 26.9km |
| Fairbanks | 32,325 (2017) | 28.2km |
| College | 12,964 (2011) | 28.8km |
Location: Cobb (1972, MF-413), loc. 42; SE1/4 sec. 30, T. 3 N., R. 2 E., of the Fairbanks Meridian. This occurrence is near the head of Tamarack Creek, about 1 mile northeast of Cleary Summit. Accuracy is within 3,000 feet.
Geology: This occurrence consists of small gold-bearing quartz veins in schist; the veins strike N 50 W and dip 28 S (Chapman and Foster, 1969). In October, 1932, an adit was driven to intersect three quartz-bearing shear zones previously found on the surface. In early February, 1933, the adit had been driven a distance of 550 feet (Pilgrim, 1933). At the 175 foot station of the adit, a one-inch-thick quartz veinlet was intersected. This stringer zone strikes N 48 W and dips 53 SW and carried a small amount of free gold. The adit intersects a second mineralized zone at the 240 foot station. This shear zone consists of barren brecciated schist and gouge. At the 380 foot station, the adit intersected a shear zone trending N 60 W and dipping 28 SW (Pilgrim, 1933; Stewart, 1933). This shear zone dips 45 SW at the surface. The shear contains a 5-inch-thick crushed quartz stockwork zone containing abundant free gold. The zone was iron-oxide stained and contained no visible sulfides.
Workings: In October, 1932, an adit was driven to intersect three quartz-bearing shear zones previously found on the surface. In early February, 1933 the adit had been driven a distance of 550 feet (Pilgrim, 1933). Mineralized zones were encountered at the 175 foot, 240 foot, and 380 foot stations (Pilgrim, 1933).
Alteration: Iron oxide stains.
Commodities (Major) - Au
Development Status: Undetermined
Deposit Model: Gold-quartz vein.
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:
Other Databases
| Link to USGS - Alaska: | LG132 |
|---|
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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