Round Mountain

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Other commodities As; Sb
Ore minerals arsenopyrite; chalcopyrite; galena; pyrite; pyrrhotite; sphalerite; stibnite
Gangue minerals quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale TL
Quadrangle map, 1:63,360-scale A-6
Latitude 62.0619
Longitude -152.6943
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Round Mountain prospect is on Round Mountain about 2 miles southeast of Puntilla Lake; it is near the southeast corner of section 23, T. 22 N., R. 19 W., of the Seward Meridian. The location is generally accurate but the size of the deposit is unclear.

Geologic setting

Geologic description

In early 2010, the Round Mountain prospect was part of the Whistler project of Kiska Metals Corporation and was actively being explored (Wahl and others, 2008; Kiska Metals Corporation, 2010a).
Cominco Alaska began mineral exploration in the area in 1986; they found this deposit but ended their work in 1989. The work by Cominco included sampling silt, soil, and rocks, magnetic and VLF geophysical surveys, and mapping at 1:12,000 scale. From 2004 to 2006, Kennecott Exploration Company carried out major exploration in the area including, geologic mapping; soil, stream sediment, and rock geochemistry; and geophysical surveys. They staked several large blocks of ground that included the Round Mountain prospect. Geoinformatics Exploration Inc. acquired the property from Kennecott in 2007, and in 2009, Kiska Metals Corporation was formed by a merger of Geoinformatics and Rimfire Minerals Corporation. Six holes were drilled on Round Mountain or nearby, probably by Cominco or Kennecott.
The rocks in the area are Jurassic and Cretaceous sedimentary rocks and Tertiary volcanic rocks (Reed and Nelson, 1980; Wilson and others, 2009) that are intruded by intermediate to mafic sills, dikes and small plugs (Cominco American Incorporated, unpublished report). The intrusive rocks are overprinted by quartz-sericite-pyrite and magnetite-carbonate alteration. Auriferous veins, pods and stockwork, that contain variable amounts of quartz, pyrite, pyrrhotite, sphalerite, galena, chalcopyrite, stibnite and arsenopyrite are concentrated along intrusive contacts and faults (Cominco American Incorporated, unpublished report). Geochemical values in rock chip samples range from several hundred parts per billion gold to just under an ounce of gold per ton in selected high-grade samples. Some samples contain up to about an ounce of silver per ton.
Round Mountain has been identified by its anomalous geochemistry, alteration, and anomalous geophysical features (Roberts, 2014).
Geologic map unit (-152.696544777148, 62.0613200186555)
Mineral deposit model Gold-copper porphyry (Cox and Singer, 1986; model 20c)
Mineral deposit model number 20c
Age of mineralization Early or middle Tertiary. The mineralization is interpreted to be coeval with or younger than Tertiary volcanic and intrusive country rocks that Reed and Nelson (1980) correlated with plutonism of the same age in this part of the Alaska Range.
Alteration of deposit Quartz-sericite-pyrite, quartz-pyrite, carbonate, and magnetite alteration (Kiska Metals Corporation, 2010a).

Production and reserves

Workings or exploration
In early 2010, the Round Mountain prospect was part of the Whistler project of Kiska Metals Corporation and was actively being explored (Wahl and others, 2008; Kiska Metals Corporation, 2010a). Cominco Alaska began mineral exploration in the area in 1986; they found this deposit but ended their work in 1989. The work by Cominco included sampling silt, soil, and rocks, magnetic and VLF geophysical surveys, and mapping at 1:12,000 scale. From 2004 to 2006, Kennecott Exploration Company carried out major exploration in the area including, geologic mapping; soil, stream sediment, and rock geochemistry; and geophysical surveys. They staked several large blocks of ground that included the Round Mountain prospect. Geoinformatics Exploration Inc. acquired the property from Kennecott in 2007, and in 2009, Kiska Metals Corporation was formed by a merger of Geoinformatics and Rimfire Minerals Corporation. Six holes were drilled on Round Mountain or nearby, probably by Cominco or Kennecott.
In 2010, Kiska drilled two core holes to complete Kiska's requirements for their partnership with Kennecott. The two holes did not return any significant results (Kiska Metals Corp., 2010b). Kiska's 2014 Executive Summary characterizes Round Mountain as an early stage prospect (Roberts, 2014).
Indication of production None
Reserve estimates None.
Production notes None.

References

MRDS Number 10308449

References

Kiska Metals Corporation, 2010a, Whistler project overview; http://www.kiskametals.com/s/Whistler.asp?ReportID=370036 (as of February 26, 2010).
Roberts, Michael, 2014, Whistler Executive Summary, Kiska Metals Corporation: http://www.kiskametals.com/i/pdf/Kiska_Whistler_ExecutiveSummary_24Jan2014.pdf (as of March 10, 2014).
Wahl, George, Coutture, Jean-Francois, and Keller, GD., 2008, Mineral resource estimation, Whistler copper-gold project, Alaska Range, Alaska: Technical report for Geoinformatics Exploration, Inc., 124 p., (posted on www.sedar.com, February 22, 2008) http://www.sedar.com/GetFile.do?lang=EN&docClass=24&issuerNo=00007774&fileName=/csfsprod/data86/filings/01219440/00000001/s%3A%5Cgxl222.pdf (as of December 9, 2014).
Reporters Madelyn A. Millholland (Millholland & Associates); D.J. Grybeck (Contractor, U.S. Geological Survey); V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 12/9/2014