Mother Lode Prospect, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Mother Lode Prospect | Prospect |
| Fairbanks Mining District | Mining District |
| Fairbanks North Star Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 3' 0'' North , 147° 27' 46'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fox | 417 (2011) | 12.6km |
| Farmers Loop | 4,853 (2017) | 19.3km |
| Fairbanks | 32,325 (2017) | 26.4km |
| College | 12,964 (2011) | 26.8km |
| Badger | 19,482 (2011) | 28.0km |
Location: Cobb (1972, MF-413), loc. 37; NW1/4 sec. 36, T. 3 N., R. 1 E., of the Fairbanks Meridian. This prospect is on the ridge at the head of Willow Creek, about a mile WNW of Cleary Summit. Accuracy is within 2,500 feet.
Geology: The prospect consists of a sericitized granite porphyry dike which cuts a stibnite-bearing schist. The stibnite occurs as pods and veinlets in the schist and as a surface coating on the dike contact (Prindle, 1910). Specimens of ore from this deposit are made up of a granular aggregate of stibnite (Brooks, 1916, p. 33; B 649). The aggregates are highly weathered, and a little pyrite occurs with the stibnite. There are also some vitreous quartz grains buried in the stibnite; some of these grains showed crystal terminations (Brooks, 1916, p. 33; B 649). The stibnite contains less that $1 per ton in gold (0.05 ounces of gold per ton) but the grade of the granite porphyry is unknown. The prospect was idle in 1916 and was noted to be associated with a horizontal structure which may have been parallel to foliation (Brooks, 1916; B 649). The Mother Lode prospect was examined as a possible source of antimony in 1942 but no additional exploration was conducted due to insufficient tonnage potential (Killeen and Mertie, 1951).
Alteration: Stibnite aggregates are highly oxidized and sericite alteration was observed in the granite porphyry dike.
Commodities (Major) - Au; (Minor) - Sb
Development Status: None
Deposit Model: Stibnite vein (Cox and Singer; model 27d).
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 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Stibnite | Sb2S3 |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | LG094 |
|---|
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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