Crystal Gulch Mine, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Crystal Gulch Mine | Mine |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 14' 2'' North , 154° 46' 47'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
See also Ruby-Strand (MD069), Birch Gulch (MD073), Holmes Gulch (MD0 72), Encio Gulch (MD063) and Upper Ruby Creek (MD068).
Location: The Crystal Gulch placer deposit is in a steep, southerly-facing, first order gulch located at 900 feet (274 m) in Section 13, T. 26 S., R. 21 E., of the Kateel River Meridian. Location is accurate to within 100 feet (30 m).
Geology: The rich Crystal Gulch placer deposit occurs in a steep first order tributary of Ruby Creek. Stream gradient averages about 500 feet per mile (650 m/km). Most of the values occurred at the intersection of the gulch with Ruby Creek. The Crystal Gulch deposit was exhausted by 1924. The uranium mineral brookite was identified by Mertie (1936). Concentrates averaged 5 percent cassiterite during the life of the operation. (Ted Almasy, personal communication, 1998). Age of mineralization is unknown, but judged to be Quaternary, based on comparative geomorphological features in southwest Alaska (Bundtzen and Miller, 1997).
Workings: The placer deposit was mined exclusively by surface-hydraulic methods (Brown, 1926; Mertie, 1936).
Production: Production estimates are lumped with other properties on Ruby Creek, which produced a total of 1,511 ounces (47 kg) of gold prior to 1942.
Commodities (Major) - Ag, Au; (Minor) - Bi, Sn, U
Development Status: Yes; small
Deposit Model: Placer Au-PGE (Cox and Singer, 1986; model no. 39c)
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Brookite Formula: TiO2 |
| ⓘ Cassiterite Formula: SnO2 |
| ⓘ Native Bismuth Formula: Bi |
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| ⓘ | Native Bismuth | 1.CA.05 | Bi |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| ⓘ | Brookite | 4.DD.10 | TiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Brookite | TiO2 |
| O | ⓘ Cassiterite | SnO2 |
| Ti | Titanium | |
| Ti | ⓘ Brookite | TiO2 |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Bi | Bismuth | |
| Bi | ⓘ Native Bismuth | Bi |
Other Databases
| Link to USGS - Alaska: | MD070 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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