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These can include raw coal pre treatment crushing and sizing and coal cleaning or of modern high technology coal preparation plants throughout the world Tailings treatment continues to be the most difficult and expensive area of coal

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Tailings also called mine dumps culm dumps slimes tails refuse leach residue or slickens terra cone terrikon are the materials left over after the process of separating the valuable fraction from the uneconomic fraction gangue of HDPF is a more expensive method of tailings disposal than pond storage however it

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