Hidden Creek Occurrence, Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Hidden Creek Occurrence	Occurrence
Yentna Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

This occurrence lies within Denali National Park and Preserve.
Location: Reed and others (1978, locality 42) show this occurrence in the headwater basin of Hidden Creek in the southeast quarter of Section 28, T.30 N., R.10 W., of the Seward Meridian in Denali National Park and Preserve.
Geology: In the headwater basin of Hidden Creek cassiterite occurs in quartz- tourmaline-muscovite veins that cut biotite granite of the early Tertiary Kahlilna pluton (Tmk) (Reed and others, 1978; Reed and Nelson, 1980).
Workings: Reconnaissance mapping, stream silt and rock sampling by the U.S. Geological Survey (Reed and others, 1978; Reed and Nelson, 1980) have been done here. Cassiterite occurs in quartz- tourmaline-muscovite veins (Reed and others, 1978; Reed and Nelson, 1980).
Age: Tertiary; mineralization is interpreted to be linked to the Kahiltna pluton (Tmk), part of the McKinley Sequence, that has been determined to range from 52.3 to 56.2 m.y. in age by K/Ar method (Reed and Lanphere, 1972; Reed and Nelson, 1980).
Alteration: Quartz-muscovite-tourmaline assemblage is developed associated with the Sn-bearing veins (Reed and others, 1978).

Commodities (Major) - Sn
Development Status: None.
Deposit Model: Sn Veins (Cox and Singer, 1986; model 15b).

Other Databases

Link to USGS - Alaska:	TL013

Other Regions, Features and Areas containing this locality

References