Unnamed Occurrence (ARDF - MH165; northeast of upper Ann Creek); Marsha, Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
63° 20' 38'' North , 145° 50' 45'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is located at an elevation of 4,250 feet northeast of upper Ann Creek. It is in the NE1/4NW1/4 section 21, T. 18 S., R. 10 E., Fairbanks Meridian.
Geology: This occurrence consists of massive sulfide-bearing float boulders as much as 1.5 feet in diameter (W.T. Ellis, oral communication, 2001). The boulders contain 60 to 70 percent massive pyrrhotite and subordinate amounts of pyrite and chalcopyrite. The float is on a slope just below a serpentinized Upper Triassic ultramafic sill that intrudes the Slana Spur Formation of Pennsylvanian age (W.T. Ellis, oral communication, 2001).
Workings: Samples of the massive sulfide contained 1.8 percent copper and 12.8 ppm silver (W.T. Ellis, oral communication, 2001). The occurrence is on active claims of MAN Resources.
Age: Late Triassic or younger.
Alteration: The ultramafic rocks are extensively serpentinized.
Commodities (Major) - Ag, Cu
Development Status: No
Deposit Model: Cu skarn (?) (Cox and Singer, 1986; model 18b).
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ 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 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MH165 |
|---|
Other Regions, Features and Areas containing this locality
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
