Giant Gold Mine (Yellowknife)

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The Giant Mine was a large gold mine located at Yellowknife, Northwest Territories. Gold was discovered on the property in 1935 by Johnny Baker, but the true extent of the gold deposits were not known until 1944 when a massive gold-bearing shear zone was uncovered beneath the drift-filled Baker Creek Valley. The discovery led to a massive post-war staking boom in Yellowknife. Giant Mine entered production in 1948 and ceased operations in 2004. It produced over 7,000,000 ozt (220,000 kg) of gold. Giant Mine is within the Kam Group, which is part of the Yellowknife greenstone belt.

On September 18, 1992, at the height of a labour dispute during the tenure of Royal Oak Mines ownership, an explosion in a drift of the mine, 750 ft (230 m) underground, killed nine strikebreakers and replacement workers riding in a man-car. Mine employee Roger Warren was later convicted of placing the bomb. The strike/lockout ended in 1993, pursuant to an order by the (then) Canada Labour Relations Board.

Owners of the mine have included Falconbridge (1948-1986 through subsidiary Giant Yellowknife Mines Limited), Pamour of Australia (1986-1990 through subsidiary Giant Yellowknife Mines Limited), Royal Oak Mines (1990-1999), and Miramar Mining Corporation (1999-2004).

The Northwest Territories' first mining museum is to be built on the old property. The N.W.T. Mining Heritage Society is in charge of the work.

Mining operations over four decades created a massive environmental liability, a problem which the mine's previous owners left to the Canadian and Northwest Territories governments to sort out. The Giant Mine contains 237,000 t (233,000 LT; 261,000 ST) of arsenic trioxide dust produced during the gold roasting process. This dust is water soluble and contains approximately 60% arsenic. The site's 950 ha (2,300 acres) footprint includes 8 open pits, 4 tailing ponds, 325,000 m3 (11,500,000 cu ft) of contaminated soils, and approximately 100 buildings including a roaster/bag house complex that is highly contaminated with arsenic and fibrous asbestos.[1] A $200 million(probably more) taxpayer-funded remediation project is underway. A main aspect of the successful proposed solution, known as the "Frozen Block Alternative," is to permanently freeze the arsenic trioxide storage chambers to keep groundwater seepage out.