Unnamed Occurrence (ARDF - WI005; east of VABM Allen), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - WI005; east of VABM Allen) | - not defined - |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 32' 48'' North , 152° 2' 34'' West
Latitude & Longitude (decimal):
Köppen climate type:
See also WI016 and WI006.
Location: This occurrence is located in a high saddle about 0.8 mile east-northeast of VABM Allen and about 4 miles northeast of the junction of Sheep Creek and John River. The occurrence is at an elevation of about 4,000 feet at the southeast corner of section 32, T. 32 N., R. 20 W., of the Fairbanks Meridian. The site is situated between, loc. 6 of Cobb (1972 [MF469]) and sample 284 of Dillon and others (1981 [AOF 133B]. The location is accurate.
Geology: Brosge and Reiser (1960) described copper sulfides and malachite at a fault contact between Devonian Skajit Limestone and a Devonian phyllite and siltstone unit at this location. Dillon and others (1981, sample 284 [AOF 133B]) described disseminated covellite and bornite and malachite stain in pale-green calc-schist and quartz veins. This sample contains up to 5,000 ppm copper and 10 ppm molybdenum. Kurtak and others (1999, no. 38) analyzed one rock sample of chlorite-quartz schist that contained chalcocite, malachite and azurite. It has 1,664 ppm copper, 4.8 ppm silver, and 23 ppb gold. Degenhart and others (1978) reported minor amounts of chalcopyrite, bornite and malachite in metamorphosed, reef limestone near VABM Allen, only a short distance west of this location.
Workings: Surface sampling and reconnaissance geochemical sampling and prospecting in the vicinity by at least four companies prior to 1978 (Degenhart and other, 1978).
Alteration: Local oxidation of copper minerals.
Commodities (Major) - Cu; (Minor) - Mo
Development Status: None
Deposit Model: Polymetallic replacement deposit (?) (Cox and Singer, 1986; model 19a)
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
7 valid minerals.
Detailed Mineral List:
| ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Covellite Formula: CuS |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Covellite | 2.CA.05a | CuS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcocite | Cu2S |
| S | ⓘ Covellite | CuS |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Covellite | CuS |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | WI005 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Brooks Range DomainVolcanic Arc
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