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Cigar Lake mine

Location
Cigar Lake mineLocation in Saskatchewan
Location	Athabasca Basin
Province	Saskatchewan
Country	Canada
Coordinates	58°04′07″N 104°32′26″W / 58.06861°N 104.54056°W / 58.06861; -104.54056
Production
Products	triuranium octoxide (U 3O 8)
Production	4,600 t (10,100,000 lb)
Financial year	2020
History
Discovered	1981
Opened	2014
Owner
Company	Cameco (50.025%) AREVA (37.1%) Idemitsu (7.875%) TEPCO (5%)
Website	Official site

The Cigar Lake Mine is a large high-grade underground uranium mine, located in the uranium-rich Athabasca Basin of northern Saskatchewan, Canada, at the south-west corner of Waterbury Lake. The deposit, discovered in 1981, is second in size of high-grade deposits only to the nearby McArthur River mine. Other deposits, such as the Olympic Dam mine in Australia, contain more uranium but at lower grades.

History

Full-scale construction began in 2005 with production originally planned for 2007, but the mine experienced a catastrophic water inflow in October 2006, which flooded the mine. A second inflow occurred in 2008 during the first attempt at dewatering the mine after sealing the initial inflow. Remediation efforts continued, and re-entry was successfully accomplished in 2010. Production was delayed several times with the startup dates being announced for 2011, 2013, and 2014.

On 13 March 2014, ore production began at the mine, with the mining system and underground processing circuits operational and uranium ore transported to the McClean Lake mill operated by AREVA Resources Canada located 70 km (43 mi) northeast of the minesite.

The deposit is located at depth of 450 m (1,480 ft), surrounded by and isolated within a layer of water-impermeable illite-chlorite clay, within the Athabasca Sandstone formation. Its age is estimated to be 1.3 billion years. Due to natural containment and lack of any traces of radioactive elements on the surface, the deposit is used as an example of an effective natural deep geological repository.

During 2020, production was temporarily suspended over two periods due to the risks posed by the COVID-19 pandemic: from March until September; and then from 14 December 2020. Production at Orano's McClean Lake uranium mill, which processes the ore from the Cigar Lake mine, was also suspended.

The Canadian Nuclear Safety Commission took regulatory action against owners Cameco in October 2022 due to the volume of waste material placed on waste pile C.

Cigar Lake Airport, which services the mine, is located 1 nautical mile (1.9 km; 1.2 mi) southwest of Waterbury Lake.

Reserves and resources

As of 31 December 2020, Cigar Lake had proven and probable reserves of 75,100 t (165.5×10^ lb) of triuranium octoxide (U
₃O
₈) at an average grade of 15.92%, for 75,070 tonnes of U
₃O
₈, and a measured and indicated resource of 47,500 t (104.7×10^ lb) of U
₃O
₈ at an average grade of 13.88%, for 47,514 tonnes of U
₃O
₈.

Ownership

The mine is owned by Cameco Corporation (50.025%), AREVA Resources Canada (37.1%), Idemitsu Canada Resources Ltd. (7.875%), and Tokyo Electric Power Company (TEPCO) Resources Inc. (5%). Cameco is the project operator.

Wolf attacks

In 2005, Kenton Joel Carnegie, a 22-year-old Canadian geological engineering student from Ontario on a work term from the University of Waterloo, was killed by wolves at Points North Landing, near Cameco's Rabbit Lake mine.

On 29 August 2016, a 26-year-old shift worker walking between buildings at the Cigar Lake mine on his midnight break was attacked and mauled by a lone timber wolf. A nearby security guard frightened the wolf away, administered first aid, and called for an air ambulance which medevaced him 675 km (419 mi) to a hospital in Saskatoon where he recovered. After the attack, authorities ordered that area wolves be shot, that food disposal systems and fencing be inspected, and that staff be educated.

Climate

See also

• Uranium market
• Unconformity uranium deposits
• Cluff Lake mine
• Key Lake mine
• List of wolf attacks in North America

References

1. ^ "Management's discussion and analysis" (PDF). Saskatoon, Canada: Cameco Corporation. 10 February 2021. p. 71. Retrieved 14 March 2021.
2. Government of Canada, Natural Resources Canada. "Place names - Waterbury Lake". www4.rncan.gc.ca.
3. http://www.ippnw.org/pdf/uranium-factsheet3.pdf
4. "Cigar Lake floods again". Nuclear Engineering International. 22 August 2008. Archived from the original on 13 June 2011. Retrieved 1 September 2008.
5. Bosker, Brent (2 March 2012). "Cameco revises timeline for Cigar Lake". Rawlco Communications. Archived from the original on 30 January 2013. Retrieved 2 March 2012.
6. "Cameco to miss 2013 target for Cigar Lake uranium project due to startup delays". The StarPhoenix. Postmedia Network. The Canadian Press. 9 September 2013. Retrieved 9 September 2013.
7. "Cameco Announces Start of Ore Production at Cigar Lake Mine". Archived from the original on 13 March 2014. Retrieved 13 March 2014.
8. "Athabasca Basin - Cigar Lake". PorterGeo Database. Linden Park, South Australia: Porter GeoConsultancy. 2007. Retrieved 29 May 2020.
9. "Ensuring Safety: Multiple-Barrier System". Nuclear Waste Management Organization. 2015. Archived from the original on 15 June 2017.
10. Basov, Vladimir (7 December 2020). "Mining Cameco reports second positive COVID-19 case at Cigar Lake". Kitco News. Montreal. Retrieved 15 March 2021.
11. "Cigar Lake to enter second COVID-related suspension". World Nuclear News. 14 December 2020. Retrieved 15 March 2021.
12. "Order issued to Cameco Corporation, Cigar Lake". nuclearsafety.gc.ca. 7 November 2022. Retrieved 30 November 2022.
13. Canada Flight Supplement. Effective 0901Z 16 July 2020 to 0901Z 10 September 2020.
14. Hopper, Tristin (14 September 2016). "'They are absolutely huge:' Wolves attack in Northern Saskatchewan as animals lose fear of humans". National Post. Toronto, Ontario. Retrieved 29 May 2020.
15. Senick, Joel (31 August 2016). "Man in hospital after wolf attack at northern Saskatchewan mine". Global News. Toronto, Canada. Retrieved 29 May 2020.
16. "Wolf expert says human habituation likely reason for Cigar Lake attack". CBC News. 1 September 2016. Archived from the original on 5 June 2023.
17. Arsenault, Julien (31 August 2016). "Worker at Saskatchewan uranium mine attacked by wolf". Canadian Manufacturing. Toronto, Ontario. The Canadian Press. Retrieved 29 May 2020.
18. "Cigar Lake, Saskatchewan". Canadian Climate Normals 1981–2010. Environment and Climate Change Canada. Retrieved 5 February 2024.

External links

• Cigar Lake

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