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Q70. Consider the following statements about Tar sands.

1.  It is a combination of clay, water and bitumen.

2.  Open Pit Mining technique is used for mining Tar sands.

3.  The processing of Tar sands involve minimal environmental impacts.

Which of the above statement(s) is/are correct?


  1. (a) Only 1 and 2           

  2. (b) Only 3

  3. (c) Only 1         

  4. (d) All of the above


Solution

The correct option is A

(a) Only 1 and 2           


Tar sands (also referred to as oil sands) are a combination of clay, sand, water, and bitumen, a heavy black viscous oil. Tar sands can be mined and processed to extract the oil-rich bitumen, which is then refined into oil. The bitumen in tar sands cannot be pumped from the ground in its natural state; instead tar sand deposits are mined, usually using strip mining or open pit techniques, or the oil is extracted by underground heating with additional upgrading

Tar sands deposits near the surface can be recovered by open pit mining techniques. New methods introduced in the 1990s considerably improved the efficiency of tar sands mining, thus reducing the cost. These systems use large hydraulic and electrically powered shovels to dig up tar sands and load them into enormous trucks that can carry up to 320 tons of tar sands per load.

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