St. Eugene

Prospect, Active

Commodities and mineralogy

Main commodities Au; Cu; Mo
Ore minerals azurite; chalcopyrite; chrysocolla; malachite; molybdenite; pyrite; pyrrhotite
Gangue minerals carbonate; quartz

Geographic location

Quadrangle map, 1:250,000-scale TY
Quadrangle map, 1:63,360-scale C-7
Latitude 61.7092
Longitude -152.5571
Nearby scientific data Find additional scientific data near this location
Location and accuracy The center of the St. Eugene prospect is about 9.8 miles north-northwest of Mount Gerdine in the Tordrillo Mountains. It is about 1.1 mile north-northeast of peak 8545, near the center of section 28, T. 19 N., R. 18 W.

Geologic setting

Geologic description

Lode claims were staked at this prospect in the 1970s but no information is available on that work (MacKevett and Holloway, 1977). There was no other work until 2009, when Millrock Resources Inc. restaked the property (Eden, 2010). In 2009 and 2010, Millrock did a geochemical survey over the area and collected numerous rock samples. In 2010 Brixton Metals Corp. optioned the property (Brixton Metals Corp., 2010). Their exploration is in the early stages.
The mineralization at the St. Eugene prospect covers an area about 5.3 by 6.5 kilometers (Eden, 2010). Three separate zones of mineralization have been found in hornfels adjacent to a Tertiary diorite intrusion. The largest extends about 700 meters along strike. Rock samples contained up to 1 percent copper and 2.1 grams of gold per tonne; quartz-carbonate veins are common. Chalcopyrite, molybdenite, pyrite, and pyrrhotite have been identified in the mineralized area. The rocks locally show strong silicification, quartz stockworks with quartz-sericite alteration, and chlorite-epidote alteration. The area is prominently stained with azurite, malachite, chrysocolla, hematite, jarosite after pyrite, and limonite. The areas of greatest interest are marked with deep red hematite staining. Eden (2010) suggests that the mineralization may represent a copper-gold-molybdenum porphyry system.
Geologic map unit (-152.55928656736, 61.7086116877248)
Mineral deposit model Copper-gold-molybdenum porphyry?
Age of mineralization Probably related to an adjacent Tertiary diorite intrusion.
Alteration of deposit The rocks locally show strong silicification, quartz stockworks with quartz-sericite alteration, and chlorite-epidote alteration. The area is prominently stained with azurite, malachite, chrysocolla, hematite, jarosite after pyrite, and limonite.

Production and reserves

Workings or exploration Lode claims were staked at this prospect in the 1970s but no information is available on that work (MacKevett and Holloway, 1977). There was no other work until 2009, when Millrock Resources Inc. restaked the property (Eden, 2010). In 2009 and 2010, Millrock did a geochemical survey over the area and collected numerous rock samples. In 2010 Brixton Metals Corp. optioned the property (Brixton Metals Corp., 2010). Their exploration is in the early stages.
Indication of production None
Reserve estimates None.
Production notes None.

References

MRDS Number A106261

References

Reporters Madelyn A. Millholland (Anchorage); D.J. Grybeck (Contractor, USGS)
Last report date 2/28/2011