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HET Occurrence, Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| HET Occurrence | Occurrence |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
66° 29' 32'' North , 150° 12' 3'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Examination of deposit was brief and exposures are poor (Patton and Miller, 1970).
Location: This occurrence is located on a bluff on the west side of the upper Kanuti River,about 9.5 miles northeast of Olsons Lake. It is at an elevation of about 2,200 feet, near the center of the NW1/4 section 7, T. 19 N., R. 12 W. of the Fairbanks Meridian. The location is accurate within one-half mile.
Geology: This occurrence consists of small grains of galena and sphalerite disseminated in a pyritiferous gossan zone (Patton and Miller, 1970). The gossan zone is about 100 yards long and occurs in silicified and sericitized lower Tertiary(?) rhyolite tuff and tuff breccia. The rhyolite lies on, and possibly intrudes, Cretaceous, biotite quartz monzonite of the Kanuti pluton. Scattered pendants of hornfelsed schist occur in the quartz monzonite. Grab samples from the gossan zone contain as much as 20,000 ppm lead, 3,000 ppm zinc, 30 ppm silver, and 500 ppm copper. Lead values are higher at the north end of the zone; zinc and copper values predominate at the south end.
Workings: Only surface sampling.
Alteration: Pyritiferous zone extensively oxidized to limonite. Rhyolite host is silicified and sericitized.
Commodities (Major) - Ag, Pb, Zn; (Minor) - Cu
Development Status: None
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:
| ⓘ Galena Formula: PbS |
| ⓘ 'Limonite' |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | BT010 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Ruby DomainDomain
- Ruby TerraneAccretionary Complex
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