Trail Creek Mine, Ruby Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Trail Creek Mine | Mine |
Ruby Mining District | Mining District |
Yukon-Koyukuk Census Area | Census Area |
Alaska | State |
USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
64° 23' 26'' North , 155° 16' 33'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Ruby | 165 (2017) | 40.1km |
Mindat Locality ID:
200405
Long-form identifier:
mindat:1:2:200405:4
GUID (UUID V4):
697b97dc-b86c-474b-99f7-0cc4f172a493
Location: Trail Creek is an east-flowing tributary of the Sulatna River. Coordinates given correspond to location 18 of Cobb (1972 [MF-405]), and represent the approximate center of placer tailings and the mine marked on the USGS Ruby B-5 topographic map (1952, revised in 1973), in section 3, T. 13 S., R. 18 E. of the Kateel River meridian. The location is accurate.
Geology: The bedrock underlying Trail Creek is phyllite, schist, and shaly slate, though the stream flows close to a contact between greenstone and schist (Eberlein and others, 1977). Some bedrock is highly pyritiferous. The gravels found in the creek are composed of subangular cobbles of greenstone, quartzite, carbonaceous shale, chert, and boulders of vein quartz (Mertie, 1936). Placer gold was discovered on Trail creek in 1911, and intermittent mining continued along the creek until at least 1991 (Eberlein and others, 1977; Swainbank and others, 1991; Bundtzen and others, 1992). The pay streak was found along 2 miles along the valley, although gold was reported to be present as far as 17 miles downstream (Eakin, 1914 [B578]). Eakin (1914 [578]) reported the depth to bedrock is about 40 feet in the upper valley and 70 feet 7 miles downstream (Eakin, 1914). The ground in the upper 3 miles where most mining took place is generally about 25 to 35 feet deep (Mertie and Harrington, 1916). Gold is found in the base of 1 to 6 feet of gravel and on top of bedrock (Mertie, 1936). The gold is irregularly distributed within the gravel, and richer ground was reported at the mouths of small tributary gulches (Mertie and Harrington, 1916). The ground ran about 0.036 to 0.109 ounces of gold per square foot of bedrock (Mertie, 1936). Prospects and mining activity are found from Elephant Creek to Little Creek, along the right limit of Trail Creek (Jim Johnson, oral communication, 2000). The gold is both rough and well-rounded, suggesting two different sources (Cobb and Chapman, 1981). It is mostly fine-grained; however, 10 percent of the gold is present in larger nuggets ( Mertie and Harrington, 1916; Cobb and Chapman, 1981). The largest nugget was about 14.5 ounces. The mean of multiple assays of the gold showed 838 parts gold per thousand and 152 parts silver per thousand (Mertie, 1936). The gold is accompanied by sand-sized cassiterite, abundant pyrite, and minor galena and scheelite (Mertie and Harrington, 1916; Mertie, 1936; Joesting, 1943; Chapman and others, 1963).
Workings: Placer gold was discovered on this creek in 1911, and intermittent mining continued along the creek until at least 1991 (Eberlein and others, 1977; Swainbank and others, 1990; Bundtzen and others, 1992).
Age: Quaternary.
Commodities (Major) - Au; (Minor) - Ag, Pb, Sn, W
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
5 valid minerals.
Detailed Mineral List:
β Cassiterite Formula: SnO2 |
β Galena Formula: PbS |
β Gold Formula: Au |
β Pyrite Formula: FeS2 |
β Scheelite Formula: Ca(WO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Galena | 2.CD.10 | PbS |
β | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
β | Cassiterite | 4.DB.05 | SnO2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | β Cassiterite | SnO2 |
O | β Scheelite | Ca(WO4) |
S | Sulfur | |
S | β Galena | PbS |
S | β Pyrite | FeS2 |
Ca | Calcium | |
Ca | β Scheelite | Ca(WO4) |
Fe | Iron | |
Fe | β Pyrite | FeS2 |
Sn | Tin | |
Sn | β Cassiterite | SnO2 |
W | Tungsten | |
W | β Scheelite | Ca(WO4) |
Au | Gold | |
Au | β Gold | Au |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS - Alaska: | RB037 |
---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Ruby DomainDomain
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.