Howard Creek Occurrence, Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Howard Creek Occurrence | Occurrence |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 22' 48'' North , 149° 54' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
This location was noted by Brosg
Location: This site is at an elevation of about 4,800 ft, approximately 5 miles south-southwest of Minnie Creek Lake and a mile east of the head of Howard Creek (sec. 36, T. 30 N., R. 11 W., of the Fairbanks Meridian). The location is accurate within a 1/2-mile radius.
Geology: This occurrence consists of widely but very sparsely distributed cherry-sized pods of quartz and pyrrhotite with traces of galena and chalcopyrite in chloritic schists (Mulligan, 1974). Goethite stains are found around these pods. Pyrite veinlets which occur along joints and fractures in the schist contain trace amounts of copper. Bedrock near the occurrence is mapped (Dillon and Reifenstuhl, 1995) as Lower Paleozoic to Proterozoic, interbanded quartzite and graphitic albite-chlorite-muscovite-quartz schist near a contact with Lower Paleozoic to Proterozoic calcareous schist and marble. Mulligan (1974) described the host rocks as chloritic schists with quartz, muscovite, garnet, ankerite-magnesite, and graphite.
Alteration: Oxidized Fe sulfides.
Commodities (Major) - Cu, Pb; (Minor) - Ni
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Pyrrhotite Formula: Fe1-xS |
| ⓘ Quartz Formula: SiO2 |
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 |
| ⓘ | Galena | 2.CD.10 | PbS |
| 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 | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | CH034 |
|---|
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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