Boulder Creek Mine (ARDF - NB007), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Boulder Creek Mine (ARDF - NB007) | 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' 32'' North , 143° 59' 38'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Slana | 147 (2011) | 7.8km |
| Mentasta Lake | 112 (2011) | 19.8km |
Location: This placer mine is in the headwaters of Boulder Creek, a west tributary to Porcupine Creek. It is an elevation of about 3,400 feet, about 5,500 feet upstream from Porcupine Creek in the SW1/4 of section 31, T. 12 N., R. 8 E. of the Copper River Meridian. Boulder Creek is not named on the USGS Nabesna D-6 quadrangle (revised 1969), but it is identified by Richter (1966) as a west tributary to Porcupine Creek, south of Slope Creek (NB001). Richter (1964) identified Slope Creek as Boulder Creek and Cobb and Richter (1980) note that confusion between these two nearby creeks exists in several early reports. Richter's (1966) location for these creeks is followed in this records. The location shown by Richter (1966, figure 5) is just inside the Gulkana quadrangle. This is locality 59 of Richter and others (1975) who show it to be just inside the Nabesna quadrangle. The location provided by Richter and others (1975) is followed in this record and is accurate within several hundred feet. Cobb and Richter (1980) include this mine under the name 'Boulder Ck.'.
Geology: Richter (1966) and Richter and others (1975) show placer gold workings on this west tributary to Porcupine Creek. At least some of the recovered gold was coarse and smooth, but if this deposit is similar to other gold placers in the area, some of the gold may have been rough, wiry,or dendritic and it may have been associated with wiry native silver, native copper, and an unidentified bismuth mineral (Moffit, 1954; Richter, 1964; 1966). Bedrock in Boulder Creek is dominantly andesitic volcanic rocks of the upper Paleozoic, Tetelna Volcanics, but felsic plutonic rocks of the Ahtell pluton are exposed about 1 mile to the west (Richter, 1966; 1976).
Workings: Small-scale surface placer workings are present.
Age: Holocene.
Commodities (Major) - Au; (Minor) - Ag, Bi, Cu
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
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
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Copper | 1.AA.05 | Cu |
| ⓘ | Gold | 1.AA.05 | Au |
| ⓘ | Silver | 1.AA.05 | Ag |
List of minerals for each chemical element
| Cu | Copper | |
|---|---|---|
| Cu | ⓘ Copper | Cu |
| Ag | Silver | |
| Ag | ⓘ Silver | Ag |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | NB007 |
|---|
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