J-26; July 26; June 26 Prospect, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| J-26; July 26; June 26 Prospect | Prospect |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 58' 55'' North , 143° 16' 51'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
This prospect lies on Doyon Ltd. selected land. For more information, contact Doyon Ltd.
Location: The J-26 prospect encompasses about 4 square miles on a hilltop, in sections 4 and 5, T. 25 N., R. 11 E., of the Copper River Meridian and sections 32 and 33, T. 26 N., R. 11 E., of the Copper River Meridian. The location is accurate, and the coordinates given in the fields above correspond to the approximate center of the prospect.
Geology: J-26 is a porphyry molybdenum prospect within a rhyolite porphyry; it is located near the margin of a propylitized, medium-grained, biotite- and hornblende-bearing, quartz monzonite stock. Nearby pelitic schist, calc-silicate schist, and marble have been recrystallized to hornfels, calc-silicate tactite and garnet-pyroxene skarn. There are numerous Tertiary (?) mafic and felsic dikes, as well as quartz veins. Alteration at the prospect consists of widespread propylitic alteration, localized silica alteration, and skarn (DiMarchi and others, 1989). The general geology consists of Tertiary felsic volcanics surrounded by Mesozoic granitic rocks (Foster, 1970). The property has been soil sampled. Elements listed above as commodities were found in anomalous concentrations in soil samples (Doyon Ltd., 1998).
Workings: Surface exploration and soil sampling have been done on the property by companies working under an exploration agreement with Doyon Ltd.
Age: Likely to be one of the three porphyry events in eastern interior Alaska at 90 to 100 Ma, 70 Ma, or 55 Ma.
Alteration: The alteration consists of widespread propylitic alteration and localized silica alteration and skarn (DiMarchi and others, 1989).
Commodities (Major) - Cu, Mo; (Minor) - Ag, Au, Pb, Zn
Development Status: None
Deposit Model: Mo-porphyry (Cox and Singer, 1986; model 21a)
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: | TC011 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Yukon-TananaVolcanic Arc
- Yukon-Tanana lower DomainDomain
USA
- Alaska
- Fortymile Mining DistrictMining District
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