Unnamed Occurrence (ARDF - TE039; on Lost River), Lost River Valley, Port Clarence Mining District, Nome Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - TE039; on Lost River)	- not defined -
Lost River Valley	Basin
Port Clarence Mining District	Mining District
Nome Census Area	Census Area
Alaska	State
USA	Country

Location: Lost River is the main south-flowing drainage in the York Mountains of western Seward Peninsula. Its mouth on the Bering Sea is 21 miles west of Brevig Mission. This locality is four miles upstream from the mouth and just below the confluence with Tin Creek, a significant east tributary to Lost River. The occurrence is in alluvial gravels of the active Lost River drainage just west of the outcropping Idaho lode prospect (TE040). It is locality 42 of Cobb and Sainsbury (1972). It was not included separately by Cobb (1975).
Geology: Bedrock in this drainage and its tributaries are various Ordovician limestone facies locally intruded by felsic and mafic dikes and granite stocks (Sainsbury, 1969). The USBM completed two churn-drill holes in the active drainage of Lost River here (Mulligan, 1959, p.12-15). This locality is just west of the outcropping Idaho lode prospect and downstream of the fluorite-beryllium-sulfide mineralization along the Rapid River fault at the Bessie-Maple (TE038) and Lost River valley lode (TE041) prospects. The two churn-drill holes showed the 5 to 6 feet of gravel on bedrock here to contain 0.29 and 0.35 pounds of tin per cubic yard. The gravels at this locality are 9 and 10 feet thick Bedrock described from the bottom of one of these holes is dolomite with chlorite, fluorite, and a trace of pyrite. The gravel in the holes also contained a trace of silver and one contained 0.04 pounds of lead per cubic yard. Galena was identified in the lead-bearing material but otherwise the mineralogy of the heavy mineral concentrates was not reported. Traces of lead and zinc were found in the bedrock but the the related minerals could not be identified (Mulligan, 1959, p. 15).
Workings: Two USBM churn-drill holes have been completed here (Mulligan, 1959).
Age: Quaternary
Production: None
Reserves: Not defined; low grades are indicated

Commodities (Major) - Sn; (Minor) - Ag, Pb
Development Status: None
Deposit Model: Alluvial tin placer (Cox and Singer, 1986; model 39e)

Other Databases

Link to USGS - Alaska:	TE039

Other Regions, Features and Areas containing this locality

References