Tyhee Development Junior Gold Mining Yellowknife Nicholas Lake Deposit

Tyhee CEO Dave Webb presents: Yellowknife Gold Project - Nicholas Lake Deposit. This resource contains 311,000 ounces measured and indicated gold, plus 120,000 ounces inferred as of March 2009.

Granite and granodiorite plutons, plugs and dykes are common throughout the region. A small granodiorite plug is the host for the gold veins of the Main Showing. Auriferous quartz-sulphide veins of the Main Showing occur in shears zones within, and on the southern margin of a 200 to 300 metre diameter granodiorite intrusive. Thirteen veins of variable continuity and grade have been recognized. The main auriferous veins on surface occur along the south border phase of the granodiorite in migmatite or in hornfels. At depth, however, drilling indicates that most of the veins occur well within the granodiorite body itself. The quartz-sulphide veins are mostly vertical but can dip to 80º in either direction. Sulphides comprise roughly 6% of the veins and include arsenopyrite, pyrite, pyrrhotite, sphalerite, galena and minor chalcopyrite in decreasing order of abundance. Gold occurs as grains about 5 to 30 µ m in size and is closely associated with fractures and open space fillings in sulphides or alone within quartz.

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• gold
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• Canada