Canada's Teck Resources said Sunday it had withdrawn its application to develop a giant oil sands mine in western Alberta, a controversial project which the federal government had been set to vote on this week.
The Frontier project would have cost about Can$20 billion (USD 15 billion) and had been expected to produce 260,000 barrels of oil per day.
But its impact on the environment had been denounced by environmentalists and the region's indigenous population: mine production would have generated 4.1 million tonnes of carbon dioxide a year, according to a study by the Impact Assessment Agency of Canada.
The Vancouver-based natural resources company said in a press release it had sent a letter to the environment minister explaining its decision.
"We are disappointed to have arrived at this point," said Teck CEO Don Lindsay in his letter to the government.
"Teck put forward a socially and environmentally responsible project that was industry leading and had the potential to create significant benefits for Canadians," he wrote, adding his company sought to balance economic development with environmental respect.
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Lindsay said investors and consumers increasingly want a framework in place that reconciles resources development and climate change.
"This does not yet exist here today and, unfortunately, the growing debate around this issue has placed Frontier and our company squarely at the nexus of much broader issues that need to be resolved," Lindsay said.
"In that context, it is now evident that there is no constructive path forward for the project." Environment Minister Jonathan Wilkinson and Natural Resources Minister Seamus O'Regan said they appreciated that Teck had made a "difficult decision."