Unnamed Occurrence (ARDF - BN049; northwest of headwaters of Humbolt Creek), Fairhaven Mining District, Nome Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
65° 49' 11'' North , 164° 30' 36'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on a level spur, at 2,000 feet elevation, 1,000 feet northwest of the upstream termination of the west headwater tributary of Humbolt Creek. Humbolt Creek is a northeast-flowing tributary to Goodhope River. This location is 2,000 feet north of the continental divide and 5,000 feet north-northwest of ARDF locality BN048.
Geology: Till and others (1986) show bedrock here to be part of a polydeformed metapelitic schist that may be Precambrian in age. Sainsbury and others (1970) indicate that rusty and quartz-veined metasedimentary rocks are present over parts of this ridge spur. This and other nearby altered zones (BN048, BN050, BN052) have been interpreted to be localized along normal faults (Sainsbury and others, 1970) that are structurally above subsurface parts of the Oonatut Granite Complex (Hudson, 1979) which outcrops 11,000 feet to the northwest. Samples of rust-stained quartz veins and brecciated quartz veins contain 0.02 to 0.06 ppm Au and up to 500 ppm As (Sainsbury and others, 1970, Table 2). Base metals were only weakly to moderately anomalous in these samples but two had tin contents of 200 ppm. The Oonatut Granite is part of the western Seward Peninsula tin granite suite (Hudson and Arth, 1983).
Workings: Shallow hand-dug prospect pits may be present.
Age: Probably Late Cretaceous; this occurrence may be associated with emplacement and crystallization of the Oonatut Granite Complex. K/Ar ages for the Oonatut Granite Complex are about 70 my (Hudson, 1979).
Alteration: The altered zones contain quartz veins and are commonly iron-oxide stained. Clay alteration may be present.
Commodities (Major) - Au; (Minor) - Cu, Pb, Sn, Zn
Development Status: None
Deposit Model: Quartz veins in schist
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
Other Databases
| Link to USGS - Alaska: | BN049 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
- Nome ComplexAccretionary Complex
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