|Company||Miramar Mining Corporation|
|Year of acquisition||1999|
The Giant Mine was a gold mine located on the Ingraham Trail, 5 km (3.1 mi) north of Yellowknife, Northwest Territories. Giant Mine is within the Kam Group, which is part of the Yellowknife greenstone belt. 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.  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). When Royal Oak went bankrupt in 1999 the Department of Indian Affairs and Northern Development (DIAND) took over responsibility for cleaning up the Giant mine site.
According to an article published in The Star in 2006, there were 15 storage chambers a total of 237,000 t (233,000 long tons; 261,000 short tons)tonnes of deadly arsenic trioxide dust, the lethal byproduct of extracting gold from the mineral arsenopyrite ore, In 2006 underground flooding around Giant Mine's Mill Pond's underground chamber which contained 16,946 t (16,678 long tons; 18,680 short tons) tonnes of arsenic trioxide dust threatened to dump large amounts of arsenic into Yellowknife Bay.
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. A civil suit also resulted on behalf of the families of the replacement workers killed in the explosion (Fullowka v. Royal Oak Ventures Inc.) In 2008 the nine Giant Mine widows lost their $10-million civil judgment when the Northwest Territories Supreme Court overturned an earlier ruling.
Mining operations over five decades has created a massive environmental liability, a problem which the mine's previous owners left to the Government of Canada and Government of the Northwest Territories to sort out. 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. The remediation plan proposed by the SRK Consulting Inc. and SENES Consultants Limited, the leading technical advisors since 2000 to Aboriginal Affairs and Northern Development Canada on the Giant Mine Remediation Project, includes underground issues such as arsenic trioxide, and remediation of the surface, water and Baker Creek.
Aboriginal Affairs and Northern Development Canada reported that the "greatest challenge associated with the remediation of Giant Mine" is the 237,000 t (233,000 long tons; 261,000 short tons) of arsenic trioxide, the lethal byproduct of extracting gold from the mineral arsenopyrite ore stored underground. Their top priority for the Giant Mine site remediation is an "effective, long-term management" of arsenic trioxide. Arsenic trioxide dust, which contains approximately 60% arsenic, is highly lethal even in small doses. It is odourless, tasteless and water-soluble.
The taxpayer-funded (c. $900m to about a billion dollars) remediation plan to permanently freeze the arsenic trioxide dust was approved by the Canadian federal government in August 2014. According to the federal civil servant in charge of the clean-up, Jane Amphlett, using technology like that used in ice-hockey rinks, coolants will permanently freeze the storage chambers containing the arsenic trioxide dust to keep groundwater seepage out in what is called the "Frozen Block Method."
The events and aftermath of the Giant Mine labour dispute and explosion were dramatized in the 1996 CBC television movie Giant Mine. Additionally the contamination is the topic of the interactive documentary "Shadow of A Giant" by Saskatchewan filmmaker Clark Ferguson who was artist in residence with Western Arctic Moving Pictures (WAMP) in 2013.
- Silke, Ryan. 2009. "The Operational History of Mines in the Northwest Territories, Canada" Self Published, November 2009.
- Silke, Ryan. 2012. "High Grade Tales: Stories from mining camps of the Northwest Territories" Self Published, January 2012.
- Bryant, Mike W. (10 July 2006), "Disaster brewing at Giant mine site", News/North, Yellowknife: Northern News Services, p. 1, retrieved 2 October 2014
- Canada’s Giant Mine: Giant headache, Yellowknife, NWT: The Economist, 27 September 2014
- Court overturns award to Giant Mine widows, Yellowknife, Northwest Territories: The Star, 27 May 2008, retrieved 2 October 2014
- "Technical Advisors", Aboriginal Affairs and Northern Development Canada, 24 July 2013, retrieved 2 October 2014
- "Giant Mine Remediation Plan". Aboriginal Affairs and Northern Development Canada. Retrieved 2 October 2014.
- "Arsenic Trioxide and the Frozen Block Method", Aboriginal Affairs and Northern Development Canada, 24 July 2013, archived from the original on 2 October 2014, retrieved 2 October 2014
- Garbutt, Nicole (4 December 2013), Artist in residence leaves city after almost three-month stint: New local film to be produced from experience, SOMBA K'E/Yellowknife, Northwest Territories: Northern News Services, retrieved 2 October 2014
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