Gold Quartz; Alaska Quartz; Hilltoro Prospect, Willow Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Gold Quartz; Alaska Quartz; Hilltoro Prospect | Prospect |
| Willow Creek Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 48' 36'' North , 149° 13' 11'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fishhook | 4,679 (2011) | 7.4km |
| Buffalo Soapstone | 855 (2011) | 12.2km |
| Farm Loop | 1,028 (2011) | 19.4km |
| Lakes | 8,364 (2011) | 23.0km |
| Tanaina | 8,197 (2011) | 23.1km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Mat-Su Rock and Mineral Club | Palmer, Alaska | 24km |
Location: On north side of Archangel Creek at 2,900 ft elevation, 1,000 ft upstream from Sidney Creek, a tributary to Archangel Creek. Marked on the Anchorage D-6 1:63,360-scale topographic map as two unlabelled adit symbols. Accurate within 400 ft. Locality 26 of Cobb (1972) and locality 20 of MacKevett and Holloway (1977).
Geology: Gold-quartz veins cut the Late Cretaceous Willow Creek Pluton. The veins are reported to be up to two feet thick, but pinch out within 40 feet of portal (Capps, 1916; 1919). Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954). A U.S. Bureau of Mines grab sample of quartz float contained 0.06 ppm (0.002 oz/ton) Au (Kurtak, 1986). The Willow Creek Pluton is a zoned pluton: the outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite.
Workings: Prospected by two tunnels, 20 ft and 212 ft long. Capps (1919) reported that the quartz vein in the longer tunnel is 16 inches thick and pinches out 40 ft from portal. Beyond that point, the tunnel follows a fault zone containing gouge. U.S. Bureau of Mines grab sample of quartz float contained 0.06 ppm (0.002 oz/ton) Au (Kurtak, 1986).
Age: Late Cretaceous or younger; veins cut the Late Cretaceous Willow Creek Pluton.
Alteration: Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).
Commodities (Major) - Au
Development Status: Undetermined
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
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:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | AN048 |
|---|
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