French Joe Mountain Occurrence, Innoko Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| French Joe Mountain Occurrence | Occurrence |
| Innoko Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 59' 32'' North , 156° 20' 31'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: This occurrence is at an elevation of about 1,600 feet of a hill locally named French Joe Mountain. The prospect is about 1.3 mile east of the 'placer mine' on Yankee Creek which is labeled on the USGS 1:63,360-scale topographic map. It is near the center of section 32, T. 33N., R. 37W., of the Seward Meridian.
Geology: The French Joe Mountain occurrence consists of hairline gold-bearing quartz veinlets and fracture fillings in quartz monzonite and quartz-feldspar porphyry that intrude shale and sandstone of the Late Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997). Disseminated arsenopyrite was observed in hand specimen. The quartz monzonite has a 40Ar/39Ar age of 71.3 Ma (T.K. Bundtzen unpublished data, 1999).
Workings: According to Toivo Rosander (oral communication, 1990), a gold deposit was found on French Joe Mountain between 1914 and 1916 and it was explored with a series of shallow prospect pits. This is one of the earliest lode discoveries in the area. Bundtzen and Laird (1983) located several old prospect pits on the south side of French Joe Mountain. North Star Exploration, Inc., collected rocks and soils on French Joe Mountain in 1998, but could not locate the old prospect pits (Hinderman and others, 1999).
Age: The French Joe Mountain intrusion has a 40Ar/39Ar age of 71.3 Ma (T.K. Bundtzen, unpublished data, 1999).
Alteration: Sericite alteration in quartz-feldspar porphyry.
Commodities (Major) - Au; (Minor) - As
Development Status: None
Deposit Model: Polymetallic vein or Porphyry Au-Cu (Cox and Singer, 1986; models 22c or 20c).
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
2 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| 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 | ⓘ Arsenopyrite | FeAsS |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | ID040 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell buried DomainDomain
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