Unnamed Occurrence (ARDF - MH127; east of lower Broxson Gulch), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 18' 3'' North , 146° 4' 58'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 4,050 feet on the east side of the east fork of the stream(s) in Broxson Gulch, in the NE1/4NE1/4 section 6, T. 19 S., R. 9 E., Fairbanks Meridian. The occurrence corresponds to locality 12 on figure 3 of Rose (1965) and locality 39 in figure 4 of Cobb (1979 [OFR 79-238]).
Geology: The rock at this occurrence is mainly serpentinized dunite of the informally named Eureka ultramafic complex. This Upper Triassic complex occupies strands of the Broxson Gulch thrust fault (W.T. Ellis, unpublished data, 1996). At the site, a copper-stained limestone block occurs in association with a chalcopyrite-bearing, 5-foot-wide zone in serpentine. The chalcopyrite-bearing zone is iron-stained and trends N60W (Rose, 1965).
Workings: The occurrence is on active MAN Resources claims.
Age: Late Triassic or younger.
Alteration: Serpentinization of dunite; oxidation of iron- and copper-bearing mineral(s).
Commodities (Major) - Cu
Development Status: None
Deposit Model: Cu in differentiated mafic-ultramafic sill.
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.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Unclassified | |||
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Si | Silicon | |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | MH127 |
|---|
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