Shirley Lake Prospect, Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Shirley Lake Prospect	Prospect
Yentna Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

The area prospected in the Long Lake Hills around Shirley Lake extends into the Talkeetna Quadrangle to the north.
Location: The prospect is located on the north side of Shirley Lake in the southeast quarter of Section 16, T. 22 N., R. 17 W. The location of this prospect is approximated from U.S. Bureau of Mines, 1998 (MAS # 0020840013); Cobb, 1972 (MF 385, locality 4); and Reed and others, 1978 (locality 37).
Geology: Secondary uranium minerals sporadically localized along joints in Tertiary tuff and tuff-breccia (Cobb, 1979, OFR 80-86, p. 22; Reed and others,1978; and Reed and Nelson,1980). Radioactive rock probably formed by deposition of small amounts of uranium that migrated with subsurface water moving along joints. Exploration did not disclose any extension of radioactive rock below surface or away from joints. Maximum amount of radioactivity in USGS samples was 0.021% uranium; prospector reported assay of 0.29% uranium in one sample (Freeman,1963, p. 29-30). The area prspected in the Long Lake Hills around Shirley Lake, extends into the Talkeetna Quadrangle to the north.
Workings: Shallow pits were excavated and scintillometer surveys conducted.
Reserves: All deposits appear to be small and low grade (Cobb, 1979, OF 80-86, p. 22).

Commodities (Major) - U
Development Status: No

Other Databases

Link to USGS - Alaska:	TY023

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References