tar sand

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tar sand

n. often tar sands
A type of oil sand from which the lighter fractions of petroleum have escaped and in which only the heavier fractions forming a residual asphalt remain.

tar sand

n
(Geological Science) a sandstone in which hydrocarbons have been trapped; the lighter compounds evaporate, leaving a residue of asphalt in the rock pores
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Ahead of the Nebraska Public Service Commissions announcement on Monday whether or not to allow TransCanada to build its proposed Keystone XL tar sands pipeline through the state, TransCanadas original Keystone pipeline has sprung yet another leak in South Dakota.
The original purpose of the Keystone XL was to capture the highest possible price for tar sands crude.
By the time President Obama announced he would reject the proposed Keystone XL pipeline to carry crude oil from Canada's tar sands to the Gulf Coast, the project was already on life support.
In the face of concerning studies predicting an impending water crisis in the Athabasca River Basin, the Natural Resources Defense Council is calling for the Alberta government to re-evaluate the water use licenses granted to the tar sands industry.
Recent tar-sands oil spills such as the Exxon-Mobil pipeline spill in Arkansas in 2013 and the Enbridge tar sands spill in Michigan in 2010 are noted.
But thanks to massive tar sands development subsidies, and with complete disregard for either the disastrous environmental consequences or the rights of First Nations, Harper has managed to turn Canada into an "energy superpower.
The Alberta delegation marched with the "Tar Sands Bloc," dedicated to voicing their opposition to the expansion of dirty, carbon-intensive tar sands and calling for a moratorium on dangerous tar sands projects.
Tar sands are a mixture of sand, clay, water and a dense and viscous tar-like form of petroleum called bitumen.
Oil from tar sands is particularly corrosive and, therefore, problematic to transport safely by pipeline.
The European Union should swiftly move ahead with its plans to implement a directive that would label oil from tar sands as dirtier than other crudes - and not fall prey to Canadian lobbying anymore, American Nobel Peace Prize winner Jody Williams said, on 26 November.
Orinoco tar sands are less viscous than Canada's Athabasca oil sands - meaning they can be produced by more conventional means - but they are buried too deep to be extracted by surface mining.
We have clear research showing that tar sands oil, which is what goes through the pipeline, has much higher greenhouse gas emissions than conventional oil, but we also have clear evidence that the Keystone XL pipeline would be a major driver of expansion of tar sands," Casey-Lefkowitz said.