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Waste deposit of colliery spoils and spent oil shale. Blaes from colliery spoil is either black or red. Black blaes contains coal dust which burns. Red blaes is inert, it has been burnt, and can be used as a construction material. Blaes from spent oil shale is pinkish, and similar in nature to red burnt colliery spoil. Blaes can be used as a general fill material or mixed with recycled road planings to produce a semi bound surface called toptrec.
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