Three Castle Mountain

Prospects, Active

Commodities and mineralogy

Main commodities Pb; Zn
Other commodities Ag; U
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale CY
Quadrangle map, 1:63,360-scale A-1
Latitude 65.226
Longitude -141.199
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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.
Geologic map unit (-141.201371330949, 65.2257279547983)
Mineral deposit model Fault-controlled Zn-Pb?
Age of mineralization Proterozoic or younger.
Alteration of deposit Gossans and local silicification of limestone, along a northeast-trending fault.

Production and reserves

Workings or exploration The area has been explored since the mid-1970s by soil and rock sampling.
Indication of production None

Additional comments

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.

References

MRDS Number 10307416

References

North Star Exploration, Inc., 1999, 1998 Annual Report Kandik, Block 7: Fairbanks, Alaska. (Report held by Doyon, Limited, Fairbanks, Alaska.)
Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.
Reporters C.E. Cameron (ADGGS)
Last report date 4/7/2000