Unnamed (south of Chisna Pass)

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals chalcopyrite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1504
Longitude -144.8157
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is south of Chisna Pass, about 1.1 mile south-southeast of the junction of Miller Gulch and Slate Creek. It is at an elevation of about 5,300 feet, about 0.2 mile southeast of the center of section 26, T. 16 N., R. 14 E.

Geologic setting

Geologic description

This record refers specifically to mineralization at this site as described by Bittenbender and others (2007). However, their description also covers several large claim groups and extensive work in the area that not only covers this site but several other nearby ARDF sites, MH300 and MH365. Those records may include data that applies to this site before it was separately recognized.
C.W. Monroe (as Northland Mines) prospected in the area from 1964 to at least 1973 and staked more than 142 lode claims that covered this site and several square miles south of Chisna Pass (Bittenbender and others, 2007). Paul Glavinovich staked at least 36 claims that probably covered this site and Resource Associates of Alaska (RAA) staked a large block of claims in the late 1970s and early 1980s. Their claims probably covered this site but the three holes they drilled were probably about 0.4 miles to the southeast at ARDF site MH365 . AMAX Exploration apparently was active in the area in about 1990 and Cominco Alaska Exploration explored in the early 90s. In 2010, Corvus Gold Inc. drilled three holes to the southeast in 2010 as described in ARDF record MH365 as part of an extensive exploration program. The work included surface sampling and mapping and geochemical and geophysical surveys on a large block of claims that undoubtedly covered this prospect.
As described by Bittenbender and others (2007) citing Nokleberg and others (1991; 1992 [MF]; 1992 [Open-File]), the rocks in the area are hypabyssal stocks, dikes, and sills of Permian andesite to rhyolite that intrude marine volcanic rocks, volcaniclastic sedimentary rocks, and thin limestones of the Pennsylvanian and Permian, Slana Spur Formation. The area is cut by a series of high angle faults. The mineralization is in a thin limestone that crops out over an area about 50 feet wide and 200 feet long; It has been replaced by a chalcopyrite-calcite-jasper-epidote-garnet skarn Select samples contained up to 50.5 parts per million silver and 6.43 percent copper. Bittenbender and others (2007) suggest that the mineralization is related to a 300.4 +/- Ma quartz monzonite intrusion to the northwest.
Geologic map unit (-144.817927094126, 63.150003021631)
Mineral deposit model Silver-copper skarn.
Age of mineralization Skarn thought to be related to a nearby 330.4 Ma, quartz-monzonite intrusion.
Alteration of deposit Mineralized skarn developed in limestone.

Production and reserves

Workings or exploration C.W. Monroe (as Northland Mines) prospected in the area from 1964 to at least 1973 and staked more than 142 lode claims that covered this site and several square miles south of Chisna Pass (Bittenbender and others, 2007). Paul Glavinovich staked at least 36 claims that probably covered this site and Resource Associates of Alaska (RAA) staked a large block of claims in the late 1970s and early 1980s. Their claims probably covered this site but the three holes they drilled were probably about 0.4 miles to the southeast at ARDF site MH365 . AMAX Exploration apparently was active in the area in about 1990 and Cominco Alaska Exploration explored in the early 90s. In 2010, Corvus Gold Inc. drilled three holes to the southeast in 2010 as described in ARDF record MH365 as part of an extensive exploration program. The work included surface sampling and mapping and geochemical and geophysical surveys on a large block of claims that undoubtedly covered this prospect.
Indication of production None
Reserve estimates None.
Production notes None.

References