|Quadrangle map, 1:250,000-scale||RM|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Shamrock Head prospect is a drill site at an elevation of about 2,240 feet on a west-trending ridge about 1.0 mile south of triangulation station Bonanza. There are several other drill sites about a half mile to the west along Rocky Creek. The geochemical anomaly that defines this prospect extends west for about 1,500 feet and east for about a mile. The prospect is about 0.5 mile north-northwest of the center of section 12, T. 11 S., R. 60 W. The location is accurate.|
The Shamrock Head prospect is outlined by a soil-geochemistry survey completed for Tonogold Resources, Inc. during the summer of 2005 (Strachan, 2005). Several samples contained a few hundred to several hundred parts per billion gold. The anomalous samples suggest a general east-west trend to the mineralized zone. At this prospect elevated arsenic correlates with gold in contrast to the high bismuth as at the Bonanza Ridge prospect about one mile to the north (RM037). Arsenic values in soils reach 1,390 parts per million. The rocks in the prospect area consist of Jurassic volcanic and intrusive rocks (Box and others, 1993; Wenz, 2004, 2005).Tonogold (2007) drilled two holes at an elevation of about 2,240 feet on a west-trending ridge about 1 mile south of triangulation station Bonanza and three holes along Rocky Creek to the west.
|Geologic map unit||(-159.853103095736, 61.0642682605036)|
|Mineral deposit model||Low-sulfide Au-Bi-Te-quartz veins.|
|Age of mineralization||Probably mid-Cretaceous as at the Bonanza Ridge prospect (RM New A1014).|
|Workings or exploration||The Shamrock Head prospect is defined by a soil geochemistry survey completed by Tonogold Resources, Inc. during the summer of 2005 (Strachan, 2005). Five holes were drilled on this prospect in 2006.|
|Indication of production||None|
Box, S. E, Moll-Stalcup, E. J., Frost, T. P., and Murphy, J. M., 1993, Preliminary geologic map of the Bethel and southern Russian Mission quadrangles, southwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2226-A, 20 p., scale 1:250,000.
Strachan, D. G., 2005, A summary and interim status report on Tonogold's 2005 geochemical exploration of the Nyac gold district, southwest Alaska: Private report for Tonogold Resources, 20 p. (Available online at: http://www.tonogold.com/i/pdf/2005_Final_Report_5m.pdf.)
Tonogold Resources, Inc., 2006: www.tonogold.com/s/Nyac.asp (as of April, 2007)
Wenz, Z.. J., 2004, Geology and gold mineralization of the Nyac district, southwest Alaska: MS thesis, University of Alaska, Fairbanks, 133 p.
|Reporters||Travis L. Hudson (Applied Geology, Inc.)|
|Last report date||4/8/2007|