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Dec. 17, 2009
Black Hawk Exploration's Wholly Owned Subsidiary Golden Black Hawk Overview of Gold and Silver Dun Glen Mine Project in Pershing County, Nevada
Press Release Source: Black Hawk Exploration, Inc. On Thursday December 17, 2009, 6:00 am EST
FOX ISLAND, Wash., Dec. 17 /PRNewswire-FirstCall/ -- Black Hawk Exploration (OTC Bulletin Board: BHWX) Further to the announcement of ''Black Hawk Exploration's wholly owned subsidiary, Golden Black Hawk, Inc. Dun Glen acquisition,'' Black Hawk Exploration is pleased to update the market with this overview of the Gold and Silver Dun Glen Mine project.
The Dun Glen Gold Project is located in northern Pershing County, Nevada and lies approximately 25 miles southwest of Winnemucca and 21 miles north of the Florida Canyon Mine. The project area consists of 94 contiguous unpatented lode mining claims covering approximately 1,870 acres within the Sierra Mining District, an area with historic published production of at least 250,000 ounces of gold from both lode and placer sources.
The property encompasses a high-grade gold-bearing structural corridor over 10,000 feet long and is surrounded by extensive historic placer mines and occurrences. Varying levels of gold production occurred at a number of small underground mines that lie within the project area between 1862-1880 and throughout the early 20th century. The most productive mines covered by the existing claims were the Auld Lang Syne, Black Hole and Monroe, producing between 50,000 - 75,000 ounces of gold while exploring to maximum depths of 250 feet. Placer operations produced over 200,000 ounces of gold, making the Sierra District one of the most productive placer districts in Nevada.
The Dun Glen Project lies at the intersection of three separate structural trends whose extensions host several major gold deposits. The property sits approximately 8 miles east of Interstate 80 with direct access provided by two highway exits and existing dirt roads.
Geology
The stratigraphy of the Sierra District consists of lower Triassic Koipato and Natchez Pass strata which are cut locally by diabase dikes and sills which are vertical or dip southeastward. Quartz veins often occur in proximity to the intermediate intrusive rocks and usually also dip moderately eastward. At Dun Glen, the Koipato consists of low-grade metamorphic rocks. Mineralization in the area consists of white to orange-brown massive quartz veins which generally have a ''mesothermal'' appearance.
Historical mining in the district never extended below the water table, which is near surface and less than 250 feet in any given area. Golden Black Hawk's 2010 exploration program currently being formulated will be to test the nature and extent of any down-dip continuity.
Previous Exploration
Franco-Nevada geologists conducted the first modern exploration at Dun Glen. The initial 157 surface samples taken from the outcrops, dumps and prospects throughout the district returned values up to 2.24 oz/ton gold and 29.8 oz/ton silver.
Following Franco-Nevada's merger with Newmont, six reverse circulation drill holes were planned at Dun Glen in 2002. Due to equipment-related logistical problems, only five of the holes were drilled with only one hole able to reach the edge of the targeted vein zone. Visible gold was noted by the project's senior geologist in the sample interval from this hole, and further drilling was recommended but never executed.
Further initial exploration at Golden Black Hawk's newly acquired Dun Glen Project was in 2007 and it included detailed geologic mapping, geochemical soil sampling, and four diamond core drill holes totaling approximately 3,600 feet.
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