Three Castle Mountain Prospects, Black Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Three Castle Mountain Prospects | Group of Prospects |
| Black Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 13' 33'' North , 141° 11' 56'' West
Latitude & Longitude (decimal):
Type:
Group of Prospects
Köppen climate type:
These prospects are located on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited. This site is within the Yukon-Charley Rivers National Preserve.
Location: The Three Castle Mountain prospects are in two areas, one north of the mountain, and one southwest of it. The Three Castle Mountain North prospects are located in section 29 and 32, T. 5 N., R. 32 E., of the Fairbanks Meridian, and the Three Castle Mountain West prospects are located in sections 8 and 9, T. 4 N., R. 32 E., of the Fairbanks Meridian. Latitude and longitude coordinates are for the Three Castle Mountain North prospects. These prospects are located on Doyon, Limited selected or conveyed land. The locations are accurate.
Geology: The Three Castle Mountain area is underlain by limestone, shale, and dolomite from the upper Tindir Supergroup (Dover and Miyaoka, 1988). The Three Castle Mountain prospects lie 7 miles southwest of the Nation Gossan prospects (CY021); they exhibit the same type of mineralization and may be part of the same system (Northstar Exploration, Inc., 1999). The Three Castle Mountain prospects consist of northeast-trending gossans that are associated with sulfide mineralization in limestone fault breccias that may be thrust breccias. Lead, zinc, and silver anomalies are common in soil samples, with lead and zinc values ranging from 1,000-10,000 parts per million, and silver ranging from 0.1 to 0.5 ounces per ton. A dolomite sample with secondary silica and traces of pyrite also contained 3.25 parts per million uranium (Northstar Exploration, Inc., 1999). The Three Castle Mountain area has been explored since the mid-1970s by soil and rock sampling.
Workings: The area has been explored since the mid-1970's by soil and rock sampling.
Age: Proterozoic or younger.
Alteration: Gossans and local silicification of limestone, along a northeast-trending fault.
Commodities (Major) - Pb, Zn; (Minor) - Ag, U
Development Status: None
Deposit Model: Fault-controlled Zn-Pb?
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
Other Databases
| Link to USGS - Alaska: | CY040 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Brooks-Northslope1 DomainDomain
- Cordillera Front and ThrustOrogenic Belt
- Laurentia triangle DomainDomain
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