Muddy Creek Central

Prospect, Active

Alternative names

Muddy Creek

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Bi
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite; pyrrhotite
Gangue minerals feldspar; quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale TY
Quadrangle map, 1:63,360-scale D-8
Latitude 61.8455
Longitude -152.8505
Nearby scientific data Find additional scientific data near this location
Location and accuracy The center of the Muddy Creek Central prospect is about 2.2 miles east-southeast of Mount Estelle and about 0.4 mile southwest of elevation 4785. It is 0.5 mile south of the center of section 2, T. 20 N., R. 20 W., of the Seward Meridian. The location is accurate to within 500 feet.

Geologic setting

Geologic description

The date of the original discovery of the Muddy Creek Central prospect is uncertain; it probably was discovered when Cominco Alaska worked in the area from 1986 to 1989 (Wahl and others, 2008). Kennecott Exploration Company was active in the area from 2004 to 2006 and staked a large block of claims that covered the Muddy Creek Central 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. As of early 2010, Kiska Metals (2010a) was actively exploring their claim blocks, which they named the Whistler project.
The Muddy Creek Central prospect covers a north-northwest trending area about 1 kilometer by 2 kilometers in size (Kiska Metals Corporation, 2010b). Numerous rock samples were collected in the area. A high percentage of them contained more than 1 gram of gold per tonne, eight contained more than 5 grams of gold per tonne, and the two best samples contained 81.1 and 111.5 grams of gold per tonne. Muddy Creek and other nearby prospects have 'high-grade gold-silver and base metals' and the rocks in the area consist of monzonite and biotite monzonite. These are probably part of the Mount Estelle pluton to the east (Wilson and others, 2009) that Reed and Lanphere (1972) dated at 65 to 66 Ma. See ARDF record TY019 for a general description of the mineralization associated with the Mount Estelle pluton in this area.
Gold mineralization is restricted to systematic sheeted vein zones with narrow millimeter-scale veinlets and pegmatitic veinlets of quartz, feldspar, tourmaline and sulfides that include arsenopyrite, minor chalcopyrite and pyrite-pyrrhotite. Gold mineralization is largely confined to the minute veinlets whereas the intervening intrusive rocks are largely unaltered and unmineralized (Roberts, 2014).
In 2011, Kiska's exploration program at Muddy Creek that focused on drilling three diamond drill holes totaling 955 meters. The first two holes tested the southwestern edge of the Phoenix Creek anomaly. The northeast directed hole, MC11-001, returned significant gold-bearing intersections including 38.8 meters averaging 0.51 gram of gold per tonne equivalent within a broader interval of 138.8 meters averaging 0.29 gram of gold per tonne equivalent. The southwest directed hole MC11-002 also had significant intersections with 45.0 meters averaging 0.52 gram of gold per tonne equivalent and 44.2 meters average 0.51 gram of gold per tonne equivalent within a broad 338.1 meters interval averaging 0.30 gram of gold per tonne equivalent. Hole MC11-003 did not reach target depth due to difficult drilling. These are the first holes at Muddy Creek and have tested a small portion of the surface geochemical anomalies (Roberts, 2014).
Geologic map unit (-152.852732144001, 61.8449061119925)
Mineral deposit model Intrusion related gold (intrusion related gold-arsenic-bismuth-type associated with reduced plutons).
Age of mineralization Probably coeval with or younger than the 65 to 66 Ma Mount Estelle pluton (Wilson and others, 2009; Reed and Lanphere, 1972).
Alteration of deposit Systematic sheeted vein zones with narrow millimeter-scale veinlets and pegmatitic veinlets of quartz, feldspar, tourmaline and sulphides that include arsenopyrite, minor chalcopyrite and pyrite-pyrrhotite (Roberts, 2014).

Production and reserves

Workings or exploration In 2011, Kiska's exploration program at Muddy Creek that focused on drilling three diamond drill holes totaling 955 meters. The first two holes tested the southwestern edge of the Phoenix Creek anomaly. The northeast directed hole, MC11-001, returned significant gold-bearing intersections including 38.8 meters averaging 0.51 gram of gold per tonne equivalent within a broader interval of 138.8 meters averaging 0.29 gram of gold per tonne equivalent. The southwest directed hole MC11-002 also had significant intersections with 45.0 meters averaging 0.52 gram of gold per tonne equivalent and 44.2 meters average 0.51 gram of gold per tonne equivalent within a broad 338.1 meters interval averaging 0.30 gram of gold per tonne equivalent. Hole MC11-003 did not reach target depth due to difficult drilling. These are the first holes at Muddy Creek and have tested a small portion of the surface geochemical anomalies (Roberts, 2014).
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

The Whistler Deposit (TY022), which is part of the Whistler project area (as is Muddy Creek), has an existing 43-101 compliant resource: 2.25 million ounces of Au equivalent (Indicated category) and 3.35 million ounces of Au equivalent (Inferred category) (Morris, 2011). However, Muddy Creek is over 16 kilometers from the Whistler Deposit and is part of a different intrusive suite than the Whistler Deposit (Roberts, 2014).

References

References

Kiska Metals Corporation, 2010a, Whistler project overview; http://www.kiskametals.com/s/Whistler.asp?ReportID=370036 (as of February 26, 2010).
Kiska Metals Corporation, 2010b, Geoinformatics portfolio - Muddy Creek, Alaska: http://www.kiskametals.com/s/MuddyCreek.asp (as of February 27, 2010).
Morris, R.J., 2011, Resource Estimate Update for the Whistler Gold Copper Deposit and Results of Property Wide Exploration, Yentna Mining District, Alaska: Technical Report (43-101) for Kiska Metals Corporation, 133 p. (posted on www.sedar.com, March 18, 2011) http://www.sedar.com/GetFile.do?lang=EN&docClass=24&issuerNo=00007774&fileName=/csfsprod/data115/filings/01703222/00000003/i%3A%5CSEDAR%5CKMTchRpAM.PDF (as of January 8, 2015).
Roberts, Michael, 2014, Whistler Project Executive Summary Report, 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, G.D., 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 January 8, 2015).
Reporters D.J. Grybeck (Contractor, U.S. Geological Survey); V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 1/9/2015