Lone Tree

Prospect, Active

Commodities and mineralogy

Main commodities Au; Pb; Zn
Other commodities Bi; Sb
Ore minerals arsenopyrite; galena; gold; jamesonite; pyrite; sphalerite; stibnite
Gangue minerals biotite; calcite; chlorite; kaolinite; halloysite; sericite (illite)

Geographic location

Quadrangle map, 1:250,000-scale BD
Quadrangle map, 1:63,360-scale C-5
Latitude 64.5161
Longitude -146.2098
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 0.4 mile southwest of the center of section 31, T. 4 S., R. 8 E., of the Fairbanks Meridian, 2.5 miles east-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

Lone 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). At least two intrusive bodies are known on the property, each of which is associated with mineralization (Eden, 2010).
Lone Tree is characterized as a gold soil anomaly with a pronounced magnetic low. It appears to be structurally controlled in a brittle-ductile shear zone that strikes roughly east-west with moderate to gentle northward dips.
In the Lone Tree area Au correlates strongly with As, Ag, Cd, and Sb and more erratically with Zn, Pb, and Bi (Eden, 2010).
The area surrounding Lone 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 Lone Tree in 2000 through soil geochemistry. At this time, Kennecott also conducted geophysical surveys consisting of an airborne magnetic survey, a gravity survey and two IP/Resistivity surveys. Soil targets were drill tested, totaling seven holes at Lone Tree. Potential ore-grade intercepts from the 2000 and 2001 drilling programs conducted by Kennecott Exploration came from the Lone Tree area with intervals of 15.93 m (USC-001), 19.22 m (USC-011) and 14 m (USC-013) that averaged 1.1 g/t, 2.03 g/t and 1.65 g/t. 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 (Eden, 2010).
In April 2006, Midas Resources Ltd. completed an RC drilling program. In
the beginning of 2007, Midas Resources Ltd. withdrew from the Uncle Sam gold project an 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).
Geologic map unit (, )
Mineral deposit model Mineralization related to shear veins.
Age of mineralization Cretaceous based on the age of the associated plutons (Wilson and others, 1998)?
Alteration of deposit Nearly all of the mineralization observed to date is associated with shears or fault zones. Alteration in shears consists of intense sericite (illite) alteration of primary feldspars and biotite, apparently overprinting an earlier chlorite + calcite + sericite alteration. Kaolinite and/or halloysite alteration of feldspars is common adjacent to Au zones and appears to be late. District wide, Au mineralization shows a strong relationship with illite alteration of primary feldspars and biotite. In addition, Au correlates strongly with As, Ag, Cd, and Sb and more erratically with Zn, Pb, and Bi (Eden, 2010).

Production and reserves

Workings or exploration
The area surrounding Lone 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 Lone Tree in by 2000 through soil geochemistry. At this time, Kennecott also conducted geophysical surveys consisting of an airborne magnetic survey, a gravity survey and two IP/Resistivity surveys. Soil targets were drill tested, totaling seven holes at Lone Tree. Potential ore-grade intercepts from the 2000 and 2001 drilling programs conducted by Kennecott Exploration came from the Lone Tree area with intervals of 15.93 m (USC-001), 19.22 m (USC-011) and 14 m (USC-013) that averaged 1.1 g/t, 2.03 g/t and 1.65 g/t. 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 (Eden, 2010).
In April 2006, Midas Resources Ltd. completed an RC drilling program. In
the beginning of 2007, Midas Resources Ltd. withdrew from the Uncle Sam gold project an dreturned 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).
Indication of production None

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