Uncle Sam

Prospects, Active

Alternative names

Sam

Commodities and mineralogy

Main commodities Au
Other commodities As; Bi; Sb
Ore minerals antimony; bismuth; gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BD
Quadrangle map, 1:63,360-scale C-5
Latitude 64.5052
Longitude -146.2384
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Uncle Sam prospects cover an area about 4 miles in diameter. The center of the area is about 2.5 miles southeast of the center of Koepke's Slough on the Salcha River; it is near the center of section 6, T. 5 S., R. 8 E., of the Fairbanks Meridian. The location is accurate within 500 feet.

Geologic setting

Geologic description

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.
Kennecott Exploration began exploration in the area in the late 1990s and they staked a block of more than 500 claims on 'exceptionally large' bismuth-arsenic-antimony stream-sediment anomalies (Millrock Resources Inc., 2010; Eden, 2010). Individual prospects within the Uncle Sam project area were identified in 2000. These include Lone Tree (ARDF number BD075) , Lone Wolf (ARDF number BD076), and Christmas Tree (ARDF number BD077), described individually in detail in separate records. Kennecott worked and drilled the property through 2003 and then passed it on to Geoinformatics Exploration Ltd., who did additional drilling under an agreement with Midas Resources Ltd. There have been 23 core holes totaling 4,198 meters on the property and 57 reverse-circulation holes totaling 2,844 meters, as well as considerable geochemical work, geophysical surveys, and sampling. It was optioned by Millrock Resources Inc. in 2009 and in 2011 the property was covered by 194 unpatented 40-acre Alaska state mining claims.
The drilling cut 19 intercepts, 3 to 12 meters wide, with more than 1.0 gram of gold per tonne (Millrock Resources Inc., 2010; Eden, 2010). Three main centers of mineralization have been identified: the Lone Wolf, Christmas, and Lone Tree zones (Millrock Resources Inc., 2010). The Lone Wolf zone is marked by a soil anomaly in gold that is over 2 kilometers long. The zone is also associated with a pronounced magnetic low. Two of the best drill intercepts are 4.0 meters with 3.03 grams of gold per tonne and 11.2 meters with 2.38 grams of gold per tonne. The Christmas zone features a soil anomaly in gold over 4 kilometers long. One drill intercept of 5.5 meters contained 4.94 grams of gold per tonne. The Lone Tree zone is magnetic high that may reflect a buried felsic intrusive. Of the several drill intercepts, the best was 6.1 meters with 10.6 grams of gold per tonne.
In 2011, Millrock with funding by Crescent Resources Inc., drilled five holes in the Lone Tree zone that totaled 1,329 meters (Millrock Resources, Inc., 2011; Crescent Resources Inc., 2011b). Some notable intercepts were 19.22 meters that averaged 2.03 grams of gold per tonne, 6.0 meters that averaged 1.79 grams of gold per tonne, and 14.0 meters that averaged 1.65 grams of gold per tonne.
Geologic map unit (-146.240782924562, 64.5047941165392)
Mineral deposit model Possibly an intrusion related, Fort Knox type, gold porphyry.
Age of mineralization Cretaceous based on the age of the associated plutons (Wilson and others, 1998)?
Alteration of deposit Locally sericite, carbonate, silicification, and/or disseminated sulfides (Eden, 2010).

Production and reserves

Workings or exploration
Kennecott Exploration began exploration in the area in the late 1990s when they staked a block of more than 500 claims on 'exceptionally large' bismuth-arsenic-antimony stream-sediment anomalies (Millrock Resources Inc., 2010; Eden, 2010). Kennecott worked and drilled the property through 2003 but then passed it on to Geoinformatics Exploration Ltd., who did additional drilling under an agreement with Midas Resources Ltd. There have been 23 core holes totaling 4,198 meters on the property and 57 reverse-circulation holes totaling 2,844 meters, as well as considerable geochemical work, geophysical surveys, and sampling. It was optioned by Millrock Resources Inc. in 2009 and in 2010; the property was covered by 194 unpatented 40-acre Alaska state mining claims.
In 2011, Millrock with funding by Crescent Resources Inc., drilled five holes in the Lone Tree zone that totaled 1,329 meters (Millrock Resources, Inc., 2011; Crescent Resources Inc., 2011b).
In December 2011, Crescent announced amendment of terms of option to earn 100 percent interest in the Uncle Sam project (Crescent Resources, 2011a). As of September 2011, the property owner is Coventry Resources Inc., which is a 100 percent owned subsidiary of Crescent Resources Inc. (Coventry Resources Inc., 2012).
Great American Minerals Exploration Inc. (GAME) consolidated ownership of the 26,639-acre Uncle Sam property and made a deal with Stone Boy Inc. on their adjacent Monte Cristo property; the area encompassing these properties, now termed the Sam project, is located about 40 miles west of Pogo mine. In 2011, the Naosi zone, a gold-silver-antimony prospect within the larger Monte Cristo property, was drilled; results included 7.92 meters of 7.8 grams of gold per tonne, 19.7 grams of silver per tonne, and 0.1 percent antimony; and, 22.83 meters grading 4.2 grams of gold per tonne, 48 grams of silver per tonne, and 0.17 percent antimony. From 2008 through 2012, Stone Boy Inc. drilled 79 holes at Naosi, outlining the deposit for about 1,500 meters along strike and to a depth of about 500 meters (Athey and Werdon, 2017).
Indication of production None

Additional comments

In 2014, individual ARDF records were made for Lone Wolf, Lone Tree, and Christmas Tree. As recently as the 2012 ARDF update, these prospects were included within part of the Uncle Sam prospects; however, each prospect has discrete geology characteristics.
In December 2011, Crescent announced amendment of terms of option to earn 100 percent interest in the Uncle Sam project (Crescent Resources, 2011a). As of September, 2012, the property owner is Coventry Resources Inc., which is a 100 percent owned subsidiary of Crescent Resources Inc. (Coventry Resources Inc., 2012).
The Sam Project as of 2016 includes the Uncle Sam, Naosi, and Monte Cristo properties. More information about the Naosi and Monte Cristo properties will be forthcoming.

References

Reporters D.J. Grybeck (Contractor, USGS); V.C. Zinno (Alaska Earth Sciences, Inc.): M.B. Werdon (DGGS)
Last report date 8/26/2017