Hidden Creek

Occurrence, Inactive

Commodities and mineralogy

Main commodities Sn
Ore minerals cassiterite
Gangue minerals muscovite; quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale C-3
Latitude 62.658
Longitude -151.151
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

In the headwater basin of Hidden Creek cassiterite occurs in quartz- tourmaline-muscovite veins that cut biotite granite of the early Tertiary Kahiltna pluton (Tmk) (Reed and others, 1978; Reed and Nelson, 1980).
Geologic map unit (-151.153291596721, 62.6574737268231)
Mineral deposit model Sn Veins (Cox and Singer, 1986; model 15b).
Mineral deposit model number 15b
Age of mineralization 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 of deposit Quartz-muscovite-tourmaline assemblage is developed associated with the Sn-bearing veins (Reed and others, 1978).

Production and reserves

Workings or exploration 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).
Indication of production None

Additional comments

This occurrence lies within Denali National Park and Preserve.

References