Unnamed Occurrence (ARDF - MF020; north wall of South Crillon Glacier), Yakutat Mining District, Hoonah-Angoon Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
58° 38' 13'' North , 137° 18' 32'' West
Latitude & Longitude (decimal):
Köppen climate type:
Site has been inaccessible because of rock falls since the early examination by Goldthwait. It is close enough to the nickel-copper deposit at locality MF005 to suggest the possible continuity of mineralization in this part of the layered complex. The site is in Glacier Bay National Park and Preserve. Kennedy and Walton (1946) cite an unpublished report by Goldthwait that may be in Dartmouth or Harvard Expedition files.
Location: The occurrence is on the north wall of Crillon Glacier 5.35 miles west- southwest of the summit of Mt. Crillon. It is at an elevation of about 3200 feet at the contact of the Crillon-La Perouse layered complex with schist. The occurrence is accurate to about 0.2 mile. The location is approximately the same as number 80 of MacKevett and others (1971) and number 3 of Cobb (1972). The occurrence is approximately 0.2 mile southwest of MF005, an occurrence of nickel and copper.
Geology: Mineralized layered gabbro near the western contact of Crillon-La Perouse layered mafic-ultramafic body contains 5-6 percent of disseminated pyrrhotite and chalcopyrite. The sulfide minerals probably are magmatic segregations The area is near the part of the stock described by Rossman (1963, B 1121-F, p. F42-43).
Workings: There are no workings. Direct knowledge of this occurrence is based on sampling of R. H. Goldthwait of the Harvard-Dartmouth Expedition cited by Kennedy and Walton (1946, p. 71), who reported 5 to 6 percent of sulfides--pyrrhotite and chalcopyrite--near the contact of the intrusive. No other party has been able to reach the Goldthwait occurrence.
Age: Tertiary.
Commodities (Major) - Cu, Ni
Development Status: No
Deposit Model: Copper-nickel(?) segregation deposit in a layered mafic-ultramafic intrusive.
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 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MF020 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
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