Unnamed Occurrence (ARDF - MH043; south-flowing tributary to Coal Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 11' 22'' North , 146° 55' 30'' West
Latitude & Longitude (decimal):
Köppen climate type:
An arsenic anomaly at the mouth of the tributary stream suggests further prospecting is warranted in the area.
Location: This occurrence is at an elevation of about 4,800 feet at the head of an unnamed south-flowing tributary to Coal Creek, in the S1/2SW1/4 section 11, T. 20 S., R. 4 E., Fairbanks Meridian. The location corresponds to mineral occurrence 27 of Clautice and others (1988, 1989). The location is accurate within one-tenth of a mile.
Geology: A small, probably Cretaceous granodiorite plug and felsite dikes intrude greenstone and argillite in the area of this occurrence (Kaufman, 1964). The deposit consists of an iron-stained quartz stockwork in argillite (Clautice and others, 1989, plate 2). The stockwork is strongly anomalous in arsenic (1,925 parts per million [ppm]) and mercury (64 ppm) and contains 170 parts per billion (ppb) gold (Clautice and others, 1988, sample 33882). Stream-sediment sample 33610S collected about one-half mile downstream was anomalous in arsenic (495 ppm) and somewhat anomalous in tungsten (25 ppm).
Workings: There are no workings at the site.
Age: Probably Cretaceous, related to intrusion of granodiorite and felsite dikes.
Commodities (Major) - Au; (Minor) - Hg
Development Status: No
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:
| ⓘ 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: | MH043 |
|---|
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