Ninja Jim

Occurrence, Active?

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Pb; Sb; Zn
Ore minerals arsenopyrite; chalcopyrite; cinnabar; gold; stibnite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale A-2
Latitude 64.0714
Longitude -141.8729
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Ninja Jim prospect is located 0.8 mile southeast from the center of section 33, T. 27 N., R. 18 E., of the Copper River Meridian. Ninja Jim is located 1.9 miles east from the town of Chicken. This location is accurate to within 30 feet of the center of the prospect.

Geologic setting

Geologic description

Ninja Jim is a prospect within the Chicken (EA9901) claim block, composed of a claim block of 12 claims held by Millrock Resources Inc. in the Fortymile mining district. The Ninja Jim prospect is named after Alaskan prospector Jim McLaughlin, who discovered the Golden Eagle lode prospect on McKinley Creek (Still and others, 1991). This area is underlain by older metamorphic rocks and younger igneous rocks. The metamorphic rocks have been dated from upper Paleozoic to Devonian with several undated units considered to be Pre-Mississippian. Metamorphic protoliths include both sedimentary and igneous rocks. The metamorphic rocks are intruded by Cretaceous, equigranular to porphyritic, felsic to intermediate igneous bodies (Foster, 1970). Gold mineralization is most commonly found in quartz and calcite veins associated with arsenopyrite, chalcopyrite, cinnabar, stibnite and other sulfide minerals (Millrock Resources Inc., 2014).
Millrock has been working the Fortymile area since 2007 conducting geochemical sampling programs at the Chicken claim block (Millrock Resources Inc., 2014). In 2008, 25 rock samples collected over 400 meters along the stream reach at Ninja Jim averaged 0.6 part per million (ppm) gold. Two rock samples collected at the head of the stream measure 3.54 ppm gold and 3.39 ppm gold (Negri, K., Database/IT/GIS Manager, Millrock Resources Inc., written communication, 2014).
Geologic map unit (, )
Age of mineralization Age of gold mineralization in the area is known to be prolific around 135 million years ago related to felsic to intermediate intrusions (Millrock Resources Inc., 2014).

Production and reserves

Workings or exploration
Millrock has been working the Fortymile area since 2007 conducting geochemical sampling programs at the Chicken claim block (Millrock Resources Inc., 2014). In 2008, 25 rock samples collected over 400 meters along the stream reach at Ninja Jim averaged 0.6 part per million (ppm) gold. Two rock samples collected at the head of the stream measure 3.54 ppm gold and 3.39 ppm gold (Negri, K., Database/IT/GIS Manager, Millrock Resources Inc., written communication, 2014).
Ninja Jim is near the adit of the Highway Copper lode deposit (EA130), which was explored for copper and gold in the 1960s and 1970s (Eberlein and others, 1977).
Indication of production None
Reserve estimates None.
Production notes None.

References