Unnamed Prospect (ARDF - BN050; Ferndale Creek), Fairhaven Mining District, Nome Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Prospect (ARDF - BN050; Ferndale Creek) | - not defined - |
| Fairhaven Mining District | Mining District |
| Nome Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 49' 47'' North , 164° 32' 24'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on a flat ridge crest at an elevation of 2,220 feet; it overlooks the headwaters of Hot Springs Creek and Ferndale Creek (a tributary to Humbolt Creek, Hudson, 1979, Plate 1). It is one mile north of the continental divide and 2,000 feet east of outcrops of the Oonatut Granite Complex (Hudson, 1979).
Geology: A very fine-grained granite dike trends N 80 W west and intrudes hornfels in the country rocks to the Oonatut Granite Complex here (Hudson, 1979). This dike and adacent country rocks have been altered and rust-stained soils, rock fragments, and small gossan fragments are localized along the trend of the dike. The presence of slickensided rock fragments in the soils suggests that the dike was emplaced along a fault that has had recurring movement. Twelve composite grab samples of soil, altered rocks, and gossan fragments collected across the altered zone contain up to 150 ppm Ag, 10,000 ppm As, 200 ppm Cd, 500 ppm Cu, greater than 20,000 ppm Pb, greater than 10,000 ppm Zn, and 700 ppm Sn. Gold was not determined (Hudson, 1979, p. 26). The length of the altered zone that was sampled is about 1,000 feet. This altered zone is interpreted to have developed above buried parts of the Oonatut Granite Complex and to be related to its crystallization. The Oonatut Granite is part of the western Seward Peninsula tin granite suite (Hudson and Arth, 1983) and the polymetallic character of this mineralization may be reflective of the lead-zinc zone in tin deposit systems (Hudson, 1979).
Workings: Shallow hand-dug prospect pits may be present.
Age: Probably Late Cretaceous; this occurrence is thought to be related to emplacement and crystallization of the Oonatut Granite Complex. K/Ar ages for the Oonatut Granite Complex are about 70 my (Hudson, 1979).
Alteration: Iron-oxide staining and bleached discoloration are common; some clay development is probably present.
Commodities (Major) - Ag, Pb, Zn (gold has not been determined for; (Minor) - Cu, Sn
Development Status: None
Deposit Model: Sulfide veining or impregnations in hornfels and granite dike
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.
Detailed Mineral List:
| ⓘ 'Clay minerals' ? |
| ⓘ 'Limonite' |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Clay minerals' ? | - | |
| ⓘ | 'Limonite' | - | |
Other Databases
| Link to USGS - Alaska: | BN050 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Brooks-Seward DomainDomain
- Nome ComplexAccretionary Complex
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