Christmas Tree

Prospect, Active

Commodities and mineralogy

Main commodities Au
Other commodities Bi; Sb
Ore minerals arsenopyrite; gold; pyrite; pyrrhotite; stibnite
Gangue minerals carbonates; goethite; quartz; sericite; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale BD
Quadrangle map, 1:63,360-scale C-5
Latitude 64.4906
Longitude -146.2404
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is part of the Uncle Sam property. The coordinates are located at the center of the claim. The prospect is about 0.2 mile south of the center of section 7, T. 5 S., R. 8 E., of the Fairbanks Meridian, 3.2 miles south-southeast of the junction of Koepke Slough, of the Salcha River, and Twentyfive Mile Creek. It is located 65 km southeast of Fairbanks, Alaska and 60 km west of the Pogo Gold Mine. The location is accurate to within about 500 feet of the center of the prospect.

Geologic setting

Geologic description

Christmas Tree is a prospect at the Uncle Sam property, within the Tintina Gold Belt. The area is blanketed by loess and surficial material and there is little outcrop. The rocks in the area consist of Paleozoic and/or Proterozoic migmatitic schist and gneiss intruded by felsic igneous rocks (Wilson and others, 1998). Christmas Tree is characterized as a gold soil anomaly over with a magnetic high thought to be associated with a mafic schist package that has been domed in the middle of the Christmas Tree area. The Christmas Tree soil anomaly is over four kilometers long and parallels northwest trending structure interpreted from airborne magnetics (Eden, 2010).
This prospect displays narrow Au mineralization related to brittle-ductile shear zones hosted within schist and schistose gneiss that are thought to be shallow to moderately dipping. Sheared veins of quartz-tourmaline ± carbonate are common and have associated goethite after sulfides. Wallrock alteration consists chiefly of intense sericitization of primary feldspars and micas along with minor silicification. The highest-grade intercept came from drilling in 2006 by Midas Resources as USC-006 (161.3-163 m), where a 1.3 m thick quartz-tourmaline veined brittle-ductile shear zone assayed 6.7 g/t Au. The most significant mineralization was intersected in USRC-0007 from 24.5-30 m (5.5 m at 4.94 g/t Au) and in URC-021 from 18.9 – 29.8 m (11.9 m at 1.61 g/t Au) (Eden, 2010).
Geologic map unit (, )
Mineral deposit model Intrusion-related gold?
Age of mineralization Cretaceous based on the age of the associated plutons? (Wilson and others, 1998).
Alteration of deposit Sheared veins of quartz-tourmaline ± carbonate are common and have associated goethite after sulfides. Wallrock alteration consists chiefly of intense sericitization of primary feldspars and micas along with minor silicification (Eden, 2010).

Production and reserves

Workings or exploration The mineralization surrounding Christmas Tree was discovered by Kennecott Exploration Company in 1999 during regional grass-roots reconnaissance of the Big Delta Quadrangle. During 1999 and 2001, Kennecott Exploration Company collected a total of 2648 soil samples, identifying Christmas Tree in by 2000 through soil geochemistry in a tight grid sampling of 100 by 100 m. At this time, Kennecott also conducted geophysical surveys consisting of an airborne magnetic survey, a gravity survey and two induced polarization (IP)/Resistivity surveys, and soil targets were drill tested, five of which were at Christmas Tree. In 2003 Kennecott optioned the claim block to Geoinformatics Exploration LTD., who then (2005) entered into an agreement in principle with Midas Resources Ltd. with respect to Geoinformatics’ Uncle Sam gold project in Alaska. Midas did some drilling in 2006. In 2010, Millrock Resources Inc. released a 43-101 compliant technical report (Eden, 2010).
Indication of production None

Additional comments

In the beginning of 2007, Midas Resources Ltd. withdrew from the Uncle Sam gold project and returned it to Geoinformatics Alaska Exploration Inc. In 2009, Millrock Resources Inc. executed an option agreement with Geoinformatics Alaska Exploration Inc. and Kiska Metals Corporation pertaining to the Uncle Sam property. In 2010, Millrock released a 43-101 compliant technical report (Eden, 2010.

References

References

Eden, Karsten, 2010, Uncle Sam Property, Yukon-Tanana Terrane, East-Central Alaska National Instrument 43-101 Technical Report, prepared for Millrock Resources Inc., Inc.: www.sedar.com (as of March 30, 2014).
Reporters V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 6/3/2014