Sun

Prospects, Active?

Alternative names

Main Sun
Hot

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Other commodities Ba
Ore minerals arsenopyrite; bornite; chalcopyrite; enargite; galena; sphalerite
Gangue minerals barite; chlorite; ferroan calcite; ferroan dolomite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale A-5
Latitude 67.0704
Longitude -155.0431
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site includes several prospects in an approximately 12-square-mile area northeast of Beaver Creek. The best known and most studied is the Sun prospect. The coordinates of the Sun prospect are about 0.3 mile south of the center of section 1, T. 19 N., R. 17 E., of the Kateel River Meridian. The location is accurate to within about 500 feet.

Geologic setting

Geologic description

This site includes several prospects in an approximately 12-square-mile area northeast of Beaver Creek. The best known and most studied is the Sun prospect (called 'Hot' by Noranda). The Sun deposit consists of stratiform, banded, massive to semi-massive sulfides in a series of elongate, southwest-plunging, lenticular bodies along three distinct mineral horizons. An upper horizon is silver, lead, and zinc rich, a middle horizon is copper rich, and a lower horizon is copper and zinc rich. According to Zdepski (1980), the Sun prospect is in a 5,000-foot-thick sequence of Devonian felsic to andesitic volcanic, volcaniclastic and intercalated pelitic sedimentary rocks separated into upper and lower units by calcareous metabasite beds of variable thickness. The upper unit of metarhyolite and related rocks contains all of the identified massive sulfides; the lower unit is dominantly pelitic schist and metarhyolite.
As described by Andover Ventures (2008), the Sun deposit was found in the mid 1970s by Sunshine Mining Company and has been variously studied by Anaconda Minerals, Noranda Mining, and Teck Cominco. The Sun deposit consists of 13 SUN claims and 12 HOT claims and has been extensively drilled. As of June 2007, Andover had staked 68, 160-acre claims adjacent to the Sun deposit and drilled 20 holes in 2007 (Andover Ventures, 2007; 2008). The results for 13 of the holes have been released. Some notable intercepts include: 10.94 meters of 2.34 percent copper, 0.77 percent lead, 5.98 percent zinc, 68.1 grams of silver per ton, and 0.266 gram of gold per tonne; 5.08 meters with 4.34 percent copper, 0.58 percent lead, 2.76 percent zinc, 99.1 grams of silver per ton, and 0.199 gram of gold per tonne; 37.01 meters of 1.17 percent copper, 1.85 percent lead, 7.26 percent zinc, 44.0 grams of silver per ton and 0.179 gram of gold per tonne; and 11.0 meters of 1.07 percent copper, 5.38 percent lead, 16.54 percent zinc, 88.6 grams of silver per tonne, and 0.210 gram of gold per tonne.
Andover drilled 6 holes in 2011 (Andover Ventures, 2011 [July 21]; 2011 [August 12]; 2011 [August 31]. Some notable intercepts were: 1) 16.5 meters with 1.60 percent copper, 3.49 percent lead, 10.25 percent zinc, 86.6 grams of silver per tonne, and 0.24 grams of gold per tonne; 2) 1.60 meters with 6.08 percent copper, 1.08 percent lead, 3.81 percent zinc, 692.9 grams of silver per tonne, and 1.792 grams of silver per tonne; and 3) 10.65 meters with 2.56 percent copper, 0.81 percent led, 4.47 percent zinc, 63.8 grams of silver per tonne, and 0.216 grams of gold per tonne.
Including the 6 holes drilled by Andover Ventures in 2011, the Sun deposit has had 76 holes drilled on it that total about 49,000 feet. Andover drilled 27 of the holes; the other were by previous operators including Anaconda, Noranda, Sunshine Mining Company, Cominco, and Bear Creek Mining Company. The deposit extends along strike for more than 1 kilometer and is open to the northeast and down dip.
Andover (2011 [Corporate presentation]) cites a 1977, Anaconda preliminary feasibility study that gives: 1) an inferred resource amenable to open-pit mining of 2.399 million tons with an average grade of 1.93 percent copper, 4.51 percent zinc, 2.39 ounces of silver per ton, and 1.20 percent lead; and 2) an inferred resource of 17.891 million tons amenable to underground mining with an average grade of 1.91 percent copper, 4.46 percent zinc, 2.37 ounces of silver per ton, and 1.18 percent lead.
A 2013 updated resource estimate was published. The copper-zinc-silver-lead-gold resources, which are comprised of massive sulfide and related mineralization, are estimated to total 2,165,000 tonnes (2,387,000 tons) at 1.42 percent copper, 1.06 percent lead, 4.11 percent zinc, 57.6 grams of silver per tonne and 0.21 gram of gold per tonne (3.9 percent copper equivalent). The inferred resources are 11,648,000 tonnes (12.84 million tons) at 1.14 percent copper, 1.37 percent lead and 3.91 percent zinc, 76.8 grams of silver per tonne and 0.24 gram of gold per tonne (3.9 percent copper equivalent) (Gustin and Ronning, 2013).
Geologic map unit (-155.04581935681, 67.0698824606787)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a
Age of mineralization Devonian, based on radiometric and fossil determinations (Gustin and Ronning, 2013).
Alteration of deposit There is a discordant chloritic alteration zone at the northeastern end of the Main Sun deposit that consists primarily of chlorite with lesser talc, siderite, ankerite, and barite and contains minor disseminated pyrrhotite and chalcopyrite. This alteration zone occurs below what may be the upper sulfide horizon, and it has a maximum known thickness of 20 meters (Gustin and Ronning, 2013).

Production and reserves

Workings or exploration
Including the 6 holes drilled by Andover Ventures in 2011, the Sun deposit has had 76 holes drilled on it that total about 49,000 feet. Andover drilled 27 of the holes; the others going back into the 1970s were by previous operators including Anaconda, Noranda, Sunshine Mining Company, Cominco, and Bear Creek Mining Company.
Andover Mining Corp. drilled 20 core holes in 2012, identifying at least six new prospects. Resampling of some mineralized intervals of historic (pre-Andover) drill core was also completed in 2012. A 43-101 technical report was published with an updated resource estimate in 2013. The mineral resources were modeled and estimated in accordance with Canadian Institute of Mining, Metallurgy and Petroleum ('CIM') definitions. The copper-zinc-silver-lead-gold resources, which are comprised of massive sulfide and related mineralization, are estimated to total 2,165,000 tonnes (2,387,000 tons) at 1.42 percent copper, 1.06 percent lead, 4.11 percent zinc, 57.6 grams of silver per tonne and 0.21 gram of gold per tonne (3.9 percent copper equivalent). The inferred resources are 11,648,000 tonnes (12.84 million tons) at 1.14 percent copper, 1.37 percent lead and 3.91 percent zinc, 76.8 grams of silver per tonne and 0.24 gram of gold per tonne (3.9 percent copper equivalent) (Gustin and Ronning, 2013).
Indication of production None
Reserve estimates
Andover (2011 [Corporate presentation]) cites a 1977, Anaconda preliminary feasibility study that gives: 1) an inferred resource amenable to open-pit mining of 2.399 million tons with an average grade of 1.93 percent copper, 4.51 percent zinc, 2.39 ounces of silver per ton, and 1.20 percent lead; and 2) an inferred resource of 17.891 million tons tons amenable to underground mining with a grade of 1.91 percent copper, 4.46 percent zinc, 2.37 ounces of silver per ton, and 1.18 percent lead.
A National Instrument 43-101, prepared by Mine Development Associates of Reno, Nev., provided the first NI 43-101-compliant mineral resource estimate for Sun. The report was completed on September 30, 2013 (Gustin and Ronning, 2013).
Using a cut-off of $75 per tonne in-ground value, the combined Main Sun and Southwest Sun deposits indicated resources are estimated to total 2,165,000 tonnes (2,387,000 tons) at 1.42 percent copper, 1.06 percent lead, 4.11 percent zinc, 57.6 grams of silver per tonne and 0.21 gram of gold per tonne (3.9 percent copper equivalent). The inferred resources are 11,648,000 tonnes (12.84 million tons) at 1.14 percent copper, 1.37 percent lead and 3.91 percent zinc, 76.8 grams of silver per tonne and 0.24 gram of gold per tonne (3.9 percent copper equivalent). This resource estimation indicates a minimum deposit size as the Main Sun remains open to the northeast and down dip and the Southwest Sun remains open to the southwest and down dip. The copper equivalent grades were calculated based on metal prices of $3 per pound copper, 95 cents per pound lead, 95 cents per pound zinc, $25 per ounce silver and $1,300 per ounce gold, and assume 100 percent recoveries (Gustin and Ronning, 2013).
The resource estimation utilized the database of 97 drill holes totaling 19,123 meters. Andover Mining Corp. has drilled 48 of the holes, totaling 10,311 meters. The remainder are historic drill holes drilled by previous operators, including Cominco (Teck Resources), Anaconda, Sunshine, Noranda and Bear Creek (Kennecott) (Gustin and Ronning, 2013).
Production notes None.

Additional comments

The prospect Picnic Creek was removed from this record and made its own record because drilling has shown the deposit is not continuous between the two. The site name 'Hot' was used by Noranda (W.T. Ellis, Vice President, Alaska Earth Sciences, oral commun., 2014).

References

MRDS Number A011912

References

Andover Mining Corp., 2012, Corporate presentation: http://www.andovermining.com/wp-content/uploads/2011/12/Andover-Mining-Corp.-Presentation-02-2012-Final.pdf (as of February 12, 2012).
Andover Ventures 2008, http://www.andoverventures.com/projects/sun/ (as of March 4, 2008).
Andover Ventures, 2011, Andover adds 9,120 acres to land position in the Ambler mining district, Alaska: (News release, December 5, 2011) http://www.andovermining.com/wp-content/uploads/2011/12/nr_2011_12_05.pdf (as of April 1, 2012).
Andover Ventures, 2011, Andover announces assay results from three discovery holes on the S.W. Sun 'VMS' target: (News release, August 12, 2011) http://www.andovermining.com/wp-content/uploads/2011/12/nr_2011_08_12.pdf (as of April 1, 2012).
Andover Ventures, 2011, Andover completes 2011 drill program, Sun property, Alaska: (News release, July 19, 2011) http://www.andovermining.com/wp-content/uploads/2011/12/nr_2011_07_19.pdf (as of April 1, 2012).
Andover Ventures, 2011, Andover reports 16.5 meter intercept of 6.6 percent copper equivalent in initial results from the 2011 drill program at Sun property, Alaska: (News release, July 27, 2011) http://www.andovermining.com/wp-content/uploads/2011/12/nr_2011_07_27.pdf (as of April 1, 2012).
Andover Ventures, 2011, Andover reports final results from the 2011 drill program at Sun property, Alaska: (News release, August 31, 2011) http://www.andovermining.com/wp-content/uploads/2011/12/nr_2011_08_31.pdf (as of April 1, 2012).
Andover Ventures, Inc., 2007, Andover - Sun Property, 2007 Surveyed drill holes: (October, 11, 2007) http://www.andoverventures.com/_resources/sun_Dec_2007.pdf (as of April 1, 2012).
Gustin, M.M., and Ronning, Peter, 2013, Technical Report on the Sun Project, Brooks Range, Alaska, 136 p.: (posted on www.sedar.com, Oct. 3, 2013) http://www.sedar.com/GetFile.do?lang=EN&docClass=24&issuerNo=00019735&fileName=/csfsprod/data147/filings/02118405/00000001/C%3A%5CSEDAR%5CFILINGS%5CAOX%5CAOXSunTechnicalReport.pdf (as of December 4, 2014).
Marrs, C.D., 1978, Geology of the Sun massive sulfide deposit, Ambler district, Alaska [abs.]: Northwest Mining Association, 84th Annual Convention, Spokane, Washington, Nov. 29-Dec. 2, 1978.
Sicherman, H.A., Russell, R.H., and Fikkan, P.R., 1976, The geology and mineralization of the Ambler district, Alaska: Spokane, Wash., Bear Creek Mining Company, 22 p.
Smith, T.E., Profett, J.M., and Heatwole, D.A., 1979, Ambler schist belt of northwest Alaska--Host terrane for volcanogenic base metal massive sulfide deposits of mid-Paleozoic age [abs.]: Geoscience Forum, 7th, Whitehorse, Yukon Territory, December 1979, Abstracts, p. 6.
Smith, T.E., Profett, J.M., Heatwole, D.A., and Seklemian, R.W., 1977, Geologic setting of base metal massive sulfide deposits, Ambler district, northwest Alaska [abs.]: Alaska Geological Society Symposium, 6th, Anchorage, April 1977, Abstracts with Program, p. 41-42.
Zdepski, J.M., 1980, Stratigraphy, mineralogy and zonal relations of the Sun massive-sulfide deposit, Ambler district, northwest Alaska: Fairbanks, University of Alaska, M.Sc. thesis, 93 p.
Reporters S.W. Nelson (Anchorage, Alaska); D.J. Grybeck (Contractor, USGS); A. Angel and V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 12/8/2014