Tiger Paw

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Ag; Au
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals calcite; chlorite; quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-1
Latitude 63.2891
Longitude -144.2332
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Tiger Paw occurrence is at an elevation of about 4,700 feet and about 0.8 mile north-northeast of peak 7835 (locally called Tiger Tooth Mountain). It is about one-half mile north-northeast of the center of section 3, T. 17 N., R. 6 E., Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

The Tiger Paw occurrence is a laterally discontinuous massive sulfide-bearing pyritic layer or unit in siliceous felsic metavolcanic schist of the upper Lagoon unit. Samples collected by Resource Associates of Alaska Inc. in the late 1970s and early 1980s contain as much as 4.9 percent copper, 3.9 percent zinc, 2.9 percent zinc, 225 parts per million (ppm) silver, and 1 ppm gold. Follow-up sampling by American Copper and Nickel Company in the mid-1990s failed to find similar high metals values (S.S. Dashevsky, unpublished data, 2002).
The Lagoon unit is a succession of dark-gray, rusty, phyllitic metamorphosed mudstones interbedded with light-gray to white to pale-green siliceous quartz-sericite(-chlorite) schist. Locally the rocks contain coarse-grained blue quartz-eyes and rare fragmental volcanic textures preserved as chloritized lithic fragments. The upper part is dominated by white to pale-green, massive to laminated quartz-eye-bearing quartz-sericite(-chlorite-pyrite) schist; finely laminated schist with minor metamorphosed black mudstone; and thin intercalations of quartzite and fine-grained metamorphosed grit. The protoliths of the volcanic rocks of the upper Lagoon unit are mainly rhyodacite and dacite, but they also include rare rhyolite and minor andesite and basalt (Dashevsky and others, 2003).
Geologic map unit (-144.235450353407, 63.2887236478812)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a).
Mineral deposit model number 28a
Age of mineralization The Drum unit, which is part of the metamorphic sequence that includes the rocks at this deposit, has been dated at the Devonian-Mississippian boundary on the basis of one SHRIMP U-Pb zircon age of 359 +/- 6 Ma at the nearby DD South prospect (MH325) (Dashevsky and others, 2003).

Production and reserves

Workings or exploration Only surface sampling and mapping have been done on this occurrence.
Indication of production None

Additional comments

Unpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.

References