Blue Quartz

Prospect, Active

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PE
Quadrangle map, 1:63,360-scale C-4
Latitude 56.5366
Longitude -133.054
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Blue Quartz prospect extends for about 500 yards a short distance inland from the shoreline of Woewodski Island, from opposite the southeast end of Butterworth Island to about the middle of the east side of Krauses Hole. It is near the east boundary of the SE1/4, section 34, T. 61 S., R. 79 E. The location is accurate.

Geologic setting

Geologic description

This prospect was discovered about 2004 and was extensively explored in 2006 and 2007 by Bravo Venture Group (2007, 2008). Quartz veins with a distinctive bluish color occurs in widely spaced, east-northeast-trending, sub-parallel zones up to 10 meters wide that extend for at least 500 meters. The veins cut Triassic metamorphic rocks and a Cretaceous diorite stock. The mineralization was hand trenched and sampled in 2006. One grab sample contained 542 grams of gold per tonne and several grab or float samples contained more than 3.0 grams of gold per ton. A channel sample contained 3.0 grams of gold per tonne across 2.0 meters. In 2007, 33 short core holes were drilled that totaled 2,541 meters. Blue quartz veins were intersected in many of these holes; the best intervals were 1.13 meters with a grade of 4.0 grams of gold per tonne and 0.73 meters with a grade of 7.2 grams of gold per tonne.
As mapped by Karl and others (1999), the rocks in the area are part of the Triassic Hyd Group, which consists of greenstone, pillow breccia, and volcanic breccia, with tuff, limestone, chert, conglomerate, sandstone, and argillite, that have been intruded by a Cretaceous diorite stock.
Geologic map unit (-133.055723234652, 56.5362542400842)
Mineral deposit model Gold-quartz vein (no sulfide).
Age of mineralization Cretaceous or younger based on the age of the diorite that the veins cut.
Alteration of deposit None specifically noted.

Production and reserves

Workings or exploration This prospect was discovered about 2004 and was extensively explored in 2006 and 2007 by Bravo Venture Group (2007, 2008). The mineralization was hand trenched and sampled in 2006. In 2007, 33 short core holes were drilled that totaled 2,541 meters.
Indication of production None

References

References

Bravo Venture Group, 2007, S.E, Alaska: http://www.bravoventuregroup.com/en/index.php?page=projects&projectid=14 (as of March 28, 2008)
Bravo Venture Group, 2008, Woewodski program update: http://www.bravoventuregroup.com/en/index.php?page=news&newsid=109, (as of March 17, 2008).
Reporters D.J. Grybeck (Port Ludlow, WA)
Last report date 6/5/2008