Boulder Creek Mine (ARDF - GU016), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Boulder Creek Mine (ARDF - GU016) | Mine |
| Chistochina Mining District | Mining District |
| Valdez-Cordova Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 46' 47'' North , 144° 0' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Slana | 147 (2011) | 8.5km |
| Mentasta Lake | 112 (2011) | 19.9km |
The association of stream sediment samples with anomalous gold and molybdenum near the elongate diorite pluton suggests that the intrusive and its contacts should be prospected for lode occurrences of gold and other metals.
Location: This placer (Cobb, 1979 [OF 79-1247 p. 6] is near the head of Boulder Creek (which is not named on the Gulkana D-1 quadrangle) at an elevation of about 3,800 feet. The prospect is about 1000 feet south of the center of section 36, T. 12 N., R. 7 E., Copper River Meridian. The prospect is shown as a placer on figure 5 of Richter (1966). It is shown as location 22 of Richter and Matson (1972) and locality 21 of MacKevett and Holloway (1977).
Geology: Boulder Creek is mainly underlain by altered volcanic rocks of the Pennsylvanian to Permian, Tetelna Formation. The mine approximately coincides with a dike-like intrusion of Jurassic diorite which cuts the Tetelna Formation. The dike-like intrusion strike north-northwest for at least a mile (Richter 1966; Richter and Matson, 1968, figures 4-8; WGM, written communication. 1980). Stream sediment samples collected on the dike and below it in Boulder Creek were anomalous in gold. Richter and Matson (1968) also found somewhat anomalous amounts of molybdenum (6 to 11 ppm) in stream sediments collected on or near the dike.
Workings: The area was prospected in the mid 1930s. Boulder Creek is almost certainly one of two unnamed gold-bearing creeks described briefly by Moffit (1938, p. 50-51) as 'two short streams that flow eastward from the divide at the head of Grubstake Creek into Porcupine Creek carry sufficient gold to encourage prospecting.' The other unnamed east-flowing auriferous creek is almost certainly Slope Creek (GU020). Moffit (1954, p. 195) also refers to easterly flowing, gold-bearing streams in the vicinity, one of which is probably Boulder Creek. Richter (1966) noted prospecting or small-scale placer mining in Boulder Creek.
Age: Holocene placer.
Production: Probably some gold was recovered during prospecting activities at the head of Boulder Creek.
Commodities (Major) - Au; (Minor) - Mo
Development Status: Yes. Very small.
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
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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:
Other Databases
| Link to USGS - Alaska: | GU016 |
|---|
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