|Quadrangle map, 1:250,000-scale||BH|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Golden Alder prospect is about 1.1 mile north of (unnamed) lake 1541 which is about 3 miles northeast of Gold Lake. The prospect is about 0.5 mile east-northeast of the center of section 18, T. 2 N., R. 58 W., of the Seward Meridian.|
As originally described by the U.S. Geological Survey, the mineralization at the Golden Alder prospect consists of oxidized, pyrite-bearing rhyolite dikes and sulfide-bearing quartz veins that cut Jurassic volcaniclastic rocks (Box and others, 1993). Anomalous values of silver, arsenic, gold, copper, mercury, molybdenum, lead, antimony, and tungsten were found in samples of quartz veins, altered dikes, and hydrothermal breccia (Frost, 1990; Frost and others, 1993). The maximum gold value was 2 parts per million (ppm) and the maximum silver value was 7 ppm. The dikes are variably replaced by sericite, illite, and quartz. Galena is the only sulfide mineral Fort and others (1993) identified in the quartz veins.The prospect was re-examined, mapped, and resampled by Gold Crest Mines Inc. in 2007 (Gold Crest, 2011 [summary]). They identified an area about 200 meters wide by 600 meters long showing diffuse carbonate-sulfide alteration (Gold Crest Mines Inc., 2011 [geology]. They collected 30 rock chip samples (Gold Crest Mines Inc., 2011 [rocks and soils]) that averaged 1.6 grams of gold per tonne; the highest contained 8.2 grams of gold per tonne.
|Geologic map unit||(-159.410449055734, 60.2643635155645)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||Jurassic or younger based on the age of the host rock. May be related to a buried pluton, many of which in the region are Late Cretaceous or Early Tertiary (?) (Box and others, 1993).|
|Alteration of deposit||Silicification, argillization, and oxidation.|
|Workings or exploration||Reconnaissance surface sampling by the U.S. Geological Survey (Box and others 1993). Re-examined, mapped, and resampled by Gold Crest Mines Inc. in 2007 (Gold Crest, 2011 [summary]).|
|Indication of production||None|
Gold Crest Mines Inc., 2011, Golden Alder anomaly, generalized geology: http://www.goldcrestminesinc.com/downloads/alaska/southern/GoldenAlder_GeoMap.pdf (as of Feb 11, 2011).
Gold Crest Mines Inc., 2011, Golden Alder target [summary]: http://www.goldcrestminesinc.com/projects/alaska/gl-golden-alder.asp (as of Feb. 11, 2011].
|Reporters||Travis L. Hudson (Applied Geology); D.J. Grybeck (Contractor, USGS)|
|Last report date||2/28/2011|