Obed Mountain coal mine spill

Athabasca River

The Obed Mountain coal mine spill was a mining disaster that occurred on October 31, 2013, when a waste pit at the Obed Mountain Mine failed near the town of Hinton in Alberta, Canada. Following the collapse of a tailings dam, up to one billion liters (260 million US gal) of wastewater flooded into the nearby Athabasca River – what may be the largest coal slurry spill in Canadian history.[1][2] The river's waters experienced immediate spikes in arsenic, metals, and carcinogenic polycyclic aromatic hydrocarbons (PAHs). Although the Athabasca was deemed safe for drinking and wildlife by the end of the year, the extent of the environment's recovery remains in doubt.

Spill

Located about 30 km (19 mi) east of Hinton, the Obed Mountain Mine was a 7,460 ha (18,400 acres) thermal coal mine with the capacity to produce about 3.2 million tonnes (7.1 billion lb) of coal per year;[3] 2.6 million tonnes (5.7 billion lb) are proven to exist, and up to 84.7 million more tonnes (190 billion lb) were posited.[3] Tailings ponds were constructed to contain water used to wash coal; besides wastewater, the pools also contained fine rock and clay particles, unrecovered coal, and flocculents.[3] Operations were suspended in 2012 because of economic pressures, and around 624 ha (1,540 acres) of the mine has been reclaimed.[3]

On October 31, 2013, one of the mine's tailings dams failed, and from between 600 million to a billion liters (160 to 260 million US gal) of slurry poured into the Plante and Apetowun Creeks.[4] The plume of waste products then joined the Athabasca River, travelling downstream for a month before settling in Lake Athabasca near Fort Chipewyan, over 500 km (310 mi) away.[4]

Environmental impact

In the first month after the spill, water quality tests revealed the presence of metals and chemicals such as cadmium, arsenic, manganese, lead, mercury, and PAHs in excess of limits for consumption or life along the first 40 km (25 mi) of the Athabasca River.[5] Mercury, for instance, was found to be nine times higher than normal, while PAHs were at levels four times higher than the Canadian standard for potable water.[4] As a result, residents were discouraged from both drinking any of the Athabasca as well as watering any livestock or pets.[6]

By December 2013, as the plume reached Fort McMurray, government officials reported that water from the Athabasca was once again below safety thresholds for both wildlife and drinking water.[5] Monitoring has continued in the years since, although First Nations representatives have continued to dispute the rigor of the sampling program, its exclusion of data from sediment, and the lack of information made available to the public.[1][4]

Aftermath

In October 2015, the Alberta Energy Regulator corporation filed charges against the mine's operators, Sheritt Coal and Coal Valley Resources Inc.,[7] on several counts of violations of the Environmental Protection and Enhancement, Water, and Public Lands Acts which could amount to up to a $2.2 million fine.[4][8] Proceedings began on January 20, 2016.[8]

References

  1. 1 2 Lisenby, Donna (November 8, 2013). "Did Canada Just Have the Largest Coal Slurry Spill in Its History?". EcoWatch. Retrieved 17 February 2016.
  2. ↑ Bennett, Dean (January 23, 2014). "Hinton Coal Mine Leak Cleanup Ordered By Alberta Government". www.huffingtonpost.ca. The Huffington Post. Retrieved 17 February 2016.
  3. 1 2 3 4 "About Obed – Obed Mountain Mine". Obed Mountain Mine. Retrieved 17 February 2016.
  4. 1 2 3 4 5 Wohlberg, Meagan (October 21, 2015). "Two Years Later, Charges Laid in Massive Alberta Coal Mine Spill". Vice News. Retrieved 17 February 2016.
  5. 1 2 Wohlberg, Meagan (December 9, 2013). "Scientist expects 'long-term damage from coal spill". Northern Journal. Retrieved 17 February 2016.
  6. ↑ Griwkowsky, Catherine (February 27, 2014). "Extent of environmental damage caused by Obed Mine spill will not be known until spring". www.edmontonsun.com. Sun+. Retrieved 17 February 2016.
  7. ↑ Weber, Bob; Cotter, John (October 16, 2015). "Companies charged over 2013 coal tailings pond spill: Alberta Energy Regulator". www.theglobeandmail.com. The Globe and Mail. Retrieved 17 February 2016.
  8. 1 2 Reuters Editorial (16 October 2015). "Charges Laid Regarding October 2013 Obed Mountain Coal Mine Spill". Reuters. Retrieved 17 February 2016.

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