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  • ...iques, but oil sands that are deeper in the ground are mined through steam-assisted methods called in situ techniques. <ref name=freedman> Freedman, B. (2011). ...injected into a vertical well and is transported down to the bitumen. The steam soaks through the oil sands, reducing the bitumen’s viscosity so that it
    6 KB (1,020 words) - 17:22, 13 November 2016