Joffre Creek Prospect, Innoko Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Joffre Creek Prospect | Prospect |
| Innoko Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 24' 18'' North , 156° 48' 18'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: Joffre Creek is a small, north-flowing headwater tributary to Madison Creek; it is not named on current U.S. Geological Survey topographic maps. The exact locations of prospecting and mining along Joffre Creek are not known; the coordinates are arbitrarily chosen for the approximate midpoint of the creek, in the SE 1/4 sec. 18, T. 24 S., R. 11 E., Kateel River Meridian. The location is accurate within 2 miles.
Geology: The country rocks in the vicinity of the lower part of Joffre Creek are volcanic; in the upper part, they comprise chert, argillite, and volcaniclastic rocks, and a Cretaceous or Tertiary monzonite intrusive body (Chapman and others, 1987). The monzonite contains large feldspar phenocrysts and stockwork quartz veining, and is heavily weathered at the surface to quartz and feldspar (S. Dashevsky, written commun., 2000). This monzonite body is the likely source of the gold in Joffre Creek (Bundtzen and others, 1987). Harrington (1919) reports considerable prospecting along Joffre Creek (along with Madison, Esperanto, and Eldorado creeks). Also see OP007-009 and OP011-013.
Workings: Harrington (1919) reports considerable prospecting along Joffre Creek.
Age: Quaternary. The source of gold in Joffre Creek is probably the Cretaceous or Tertiary monzonite pluton in its headwaters (Bundtzen and others, 1987).
Commodities (Major) - Au
Development Status: Undetermined.
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
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:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | OP010 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell-Innoko-Idono DomainDomain
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