Unnamed Occurrence (ARDF - MH225; west of lower Canwell Glacier), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 19' 35'' North , 145° 35' 31'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of 4,800 on the west valley wall of lower Canwell Glacier. It is one-quarter mile due west of the center of section 26, T. 18 S., R. 11 E., Fairbanks Meridian. This record combines the description of the occurrence by Hanson (1963, p. 72) with that of locality S116 of table 2 in Nokelberg and others (1991).
Geology: Hanson (1963) described this location as pyrite- and arsenopyrite-bearing silicified granodiorite. Nokelberg and others (1991) described it as a 25- by 50-foot silicified zone of chalcopyrite- and pyrite-bearing quartz veins in fractures in silicified mid-Cretaceous quartz diorite. W.T. Ellis (oral communication, 1996) described the host rock as quartz monzonite that grades into quartz diorite where it intrudes the Canwell mafic-ultramafic sill of Late Triassic age. An American Copper and Nickel Company sample of silicified and iron-stained quartz monzonite contained 1,030 parts per million (ppm) copper (W.T. Ellis, oral communication, 1996). A grab sample of the 25- by 50-foot silicified zone contained 12,000 ppm copper, 30 ppm silver, and 0.10 ppm gold (Nokleberg and others, 1991).
Workings: An American Copper and Nickel Company sample of silicified and iron-stained quartz monzonite contained 1,030 parts per million (ppm) copper (W.T. Ellis, oral communication, 1996). A grab sample of the 25- by 50-foot silicified zone contained 12,000 ppm copper, 30 ppm silver, and 0.10 ppm gold (Nokleberg and others, 1991).
Age: Probably mid-Cretaceous.
Alteration: The granitic host rocks are variably silicified; iron sulfide minerals are oxidized.
Commodities (Major) - Ag, Au, Cu
Development Status: No
Deposit Model: Porphyry Cu (Cox and Singer, 1986; model 17).
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | MH225 |
|---|
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