Low

Prospect, Active

Commodities and mineralogy

Main commodities Au
Other commodities Ag; As; Bi; Cu; Pb; Te; Sb; Zn
Ore minerals arsenopyrite; gold
Gangue minerals muscovite; quartz

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale A-6
Latitude 63.1478
Longitude -143.9024
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Low prospect is about 6.7 miles west of the junction of the Tok and Dry Tok Rivers. It is about 2.0 miles south-southeast of VABM 7302 'White' and about 0.4 mile south-southeast of the center of section 16, T. 16 N., R. 8 E., of the Copper River Meridian. The location is accurate within 1/4 mile.

Geologic setting

Geologic description

The rocks in the area are part of the Tok Schist and consists mainly of quartz-muscovite schist with a thick layer of quartz-chlorite schist (Rhyolite Resources Ltd., 2012a). The Tok Schist is cut by several steep to vertical faults, one of which controls the trend of the mineralization at the nearby Shalosky prospect (TC042). To the north across a north-dipping thrust fault, the rocks are a folded sequence of argillaceous sediments, felsic-sulphidic schist, chlorite schist, feldspar-quartz schist, banded sedimentary rocks, and gabbro. The age of the rocks is uncertain; Foster (1970) only indicates that they are Paleozoic or Mesozoic.
The mineralization in the area is sediment hosted and controlled by structure; it is associated with zones of silicification and quartz-vein stockwork (Rhyolite Resources Ltd., 2012b). (Unstated) sulfides vary from 1 to more than 20 percent of the mineralization. There is a strong geochemical association of the gold with arsenic and antimony; copper, lead, zinc, bismuth, tellurium, and silver are low.
From 1998 through 2001, Grayd Resources and Placer Dome Inc. explored the area (Rhyolite Resources Ltd., 2012a; 2012b). They collected many rock and geochemical samples, trenched, and drilled 12 holes in the area totaling 1,174 meters, but the data are not publicly available. It is likely that they discovered the Low prospect. In 2009, Rhyolite Resources acquired the property and identified 3 high-priority areas that included the Low prospect.
Rhyolite Resources Ltd. (2011a; 2011b; 2012a; 2012b) drilled four holes totaling 537 meters at the Low prospect in 2011 and collected surface samples. The Tok Schist in the vicinity consists of highly altered, oxidized, calcareous metasedimentary rocks intruded by mafic/intermediate dikes. Samples of a trench 26.2 meters long contained up to 15.74 grams of gold per tonne. Two of the holes cut mineralization; notable intercepts were 13.6 meters with 3.4 grams of gold per tonne and 5.5 meters with 4.2 grams of gold per tonne. The Low prospect is associated with a steeply dipping shear zone with quartz veining, brecciation, and fault gouge. The mineralized structure has been traced for 150 meters on the surface.
Geologic map unit (-143.904638731689, 63.1474253242907)
Mineral deposit model Gold-quartz in veins and brecciated zones; lower grade disseminated mineralization? (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c?
Age of mineralization Unknown other than that it is younger than the Paleozoic or Mesozoic host rocks (Foster, 1970).
Alteration of deposit Hydrothermal-silica and muscovite (Rhyolite Resources Ltd., 2014). Mineralization is associated with highly altered, oxidized calcareous metasedimentary rocks intruded by mafic/intermediate dikes (Rhyolite Resources Ltd., 2011b).

Production and reserves

Workings or exploration
The earliest documented samples of gold mineralization from Low Prospect were collected in 1996 by prospector Adam Low who found quartz-stibnite boulders and arsenopyrite bearing float while exploring on behalf of American Copper & Nickel Company, Inc (ACNC). Subsequent work by ACNC and Grayd Resources located and trenched a source area shedding the gold-arsenopyrite mineralization in talus, but not the stibnite style of mineralization. (S. Dashevsky, President, Northern Associates Inc., oral communication, 2014).
From 1998 through 2001, Grayd Resources and Placer Dome Inc. explored in the area (Rhyolite Resources Ltd., 2012a; 2012b). They collected many rock and geochemical samples, trenched, and drilled 12 holes in the area totaling 1,174 meters, but the data are not publicly available. It is likely that they discovered the Low prospect and may have drilled it. In 2009, Rhyolite Resources acquired the property and identified 3 high-priority areas that included the Low prospect.
In 2010 geologists from Northern Associates, Inc. collected a series of three contiguous one meter long samples from sub-talus bedrock on behalf of Rhyolite Resources Ltd., which returned gold assays of 8.75 grams per tonne, 18.95 grams per tonne, and 12.4 grams per tonne . Five meters to the west, two contiguous one meter samples returned 3.51 grams of gold per tonne and 3.03 grams of gold per tonne. A further 150 meters to the west, channel sampling returned a weighted average of 3.76 grams of gold per tonne over 4 meters with a perpendicular channel sample yielding 6.23 grams of gold per tonne over 0.5 meter. Individual rock samples collected along the Low zone returned from 0.01 gram of gold per tonne to 18.95 grams of gold per tonne (Rhyolite Resources Inc., 2014).
Rhyolite Resources Ltd. completed a four hole diamond drill program, totaling 537 meters, in 2011 and collected surface samples. Two holes targeting the Hi-Low Showing encountered significant gold values within oxidized, carbonaceous fragmented schists and, silica and muscovite alteration that is associated with intermediate and mafic dikes (WG11-05: 27.4 meters at 1.9 grams of gold per tonne including 2.8 meters of 14.2 grams of gold per tonne). The dikes appear to have utilized the same structures as the mineralizing fluids, and they are themselves altered and locally auriferous (WG11-06: 2.2 meters at 8.6 grams of gold per tonne). In other cases, dikes are barren. Thus the relationship between dikes and the auriferous hydrothermal system remains poorly constrained (Rhyolite Resources Inc., 2014).
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Rhyolite Resources Ltd., 2011b, Rhyolite drilling extends gold discoveries at Paxson: Highlight include 1.6 gr/t Au over 70.1 meters. 1.0 g/t Au over 100.1 m and 8.6 g/t over 2.2 m: http://www.rhyoliteresources.com/s/NewsReleases.asp?ReportID=490614&_Type=News-Releases&_Title=Rhyolite-Drilling-Extends-Gold-Discoveries-at-Paxson-Highlights-Include-1.6... (News release, November 8, 2011).
Rhyolite Resources Ltd. 2012a, (Corporate Presentation): http://www.rhyoliteresources.com/i/pdf/CorporatePresentation.pdf (as of February 18, 2012).
Rhyolite Resources Ltd., 2012b, Projects overview: http://www.rhyoliteresources.com/s/Projects.asp (as of February 23, 2012).
Rhyolite Resources Ltd., 2014, Paxson Project: http://www.rhyoliteresources.com/s/Paxson.asp (as of December 3, 2014).
Reporters V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 12/12/2014