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  • Context (TH): Total gaseous organic carbon emissions from oil sands operations exceed industry-reported values by 1,900% to over 6,300% across the studied facilities.
  • Oil sands (also called tar sands) are a mixture of sand, clay, water, and bitumen.
  • The oil is in the form of bitumen, a very heavy liquid or sticky black solid with low melting temperature.
  • Oil sand is a naturally occurring petrochemical that can be upgraded into crude oil and other petroleum products.
  • It must be processed before it can be used by refineries to produce fuels such as gasoline and diesel.
  • The largest deposits of tar sands in the world are found in Alberta (Canada) and Venezuela.
  • Tar sands are mined in two ways:
    1. Open-pit mining: If tar sands are found near the surface, as in Alberta, Canada, they can be mined directly – much like open-pit coal mining – and then transferred to an extraction plant where the bitumen can be separated from the sand, clay, and water.
    2. In-situ mining: If tar sands are too deep to dig up, the bitumen can be extracted by injecting hot steam or solvents to loosen up the bitumen and allow it to flow through a well to the surface.
  • Crude bitumen is a thick, sticky form of crude oil, and is so viscous that it will not flow unless heated or diluted with lighter hydrocarbons such as light crude oil or natural-gas condensate.
  • At room temperature, it is much like cold molasses.

Oil Sands

Harmful impacts of oil sands

  • Tar sands extraction emits up to three times more global warming pollution than does producing the same quantity of conventional crude.
  • It depletes and pollutes freshwater resources and creates giant ponds of toxic waste.
  • Oil sands operations release pollutants into the air, including greenhouse gases and other harmful pollutants like NOx and SOx.
  • Refining the oil sands produces petroleum coke, a hazardous by-product.
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