Unnamed Occurrence (ARDF - MH117; west side of Broxson Gulch), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 18' 55'' North , 146° 10' 1'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of 3,500 feet at the mouth of an east-flowing tributary to the stream(s) in Broxson Gulch, approximately in the center of the NW1/4 section 35, T. 18 S., R. 8 E., Fairbanks Meridian. The occurrence corresponds to locality 17 of MacKevett and Holloway (1977), locality 33 in figure 4 of Cobb (1979 [OFR 79-238]), and locality 3 on figure 3 of Rose (1966 [ADMM GR 20]).
Geology: This record describes two mineral localities: asbestos in dunite, and base metals in slate near the dunite. The asbestos deposit is in an Upper Triassic serpentinized dunite sill that can be followed for more than 5 miles (Rose, 1966 [ADMM GR 20, figure 3]). The dunite is part of the informally named Eureka ultramafic complex that occupies strands of the Broxson Gulch thrust fault (Nokleberg and others, 1991; W.T. Ellis, unpublished data, 1996). The deposit consists of chrysotile asbestos in the dunite. Rose (1966 [ADMM GR 20, p. 20]) reported 0.25-inch veinlets of chrysotile in bedrock at the site and found prospectors' samples of larger veins nearby. Paleozoic slate near the dunite is marked by gossan that carries anomalous amounts of copper, lead, and zinc (MacKevett and Holloway, 1977, p. 37, locality 17).
Workings: The occurrence is on active MAN Resources claims.
Age: The dunite host of chrysotile is of Late Triassic age; the chrysotile may have formed during Cretaceous faulting and regional metamorphism (Nokleberg and others, 1991). The base metal-bearing gossan in slate is Paleozoic or younger.
Commodities (Major) - Asbestos; (Minor) - Cu, Pb, Zn
Development Status: None
Deposit Model: Serpentinite-hosted asbestos (Cox and Singer,1986; model 8d). The base metal-be
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.
Detailed Mineral List:
| ⓘ Chrysotile Formula: Mg3(Si2O5)(OH)4 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 9 - Silicates | |||
|---|---|---|---|
| ⓘ | Chrysotile | 9.00. | Mg3(Si2O5)(OH)4 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | Oxygen | |
| O | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Mg | Magnesium | |
| Mg | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| Si | Silicon | |
| Si | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
Other Databases
| Link to USGS - Alaska: | MH117 |
|---|
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