| 11. | The deposit is essentially flat-lying at the surface, making open pit mining the extraction method of choice.
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| 12. | This was put down to increased knowledge of the field as well as improvement in extraction methods.
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| 13. | Oil extraction methods in those times were very primitive mainly hand-dug wells, drilled to very shallow depths.
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| 14. | Environmental groups said the crude extraction methods released poisonous chemicals into the air and nearby streams and wells.
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| 15. | Products from different extraction methods are known under different names even though their starting materials are the same.
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| 16. | His extraction method created a product that caused some immune responses in children and was far from pure.
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| 17. | Operations manager Elliott Mallard said an extraction method the company started using several years ago causes minimal damage.
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| 18. | Sealed extraction methods are best to prevent the continued introduction of oxygen, as well as light to the oil.
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| 19. | They're also using more solvent extraction methods, which tends to be cheaper because it avoids the need for smelting.
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| 20. | Extraction yields from 30 % to 50 % of the oil in the kernels, depending on the extraction method.
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