2. Nature and physico-chemical characteristics

Our references are taken from the PREDIS guide and LCPC documentation.

2.1 Nature of the shale

Shale can vary considerably in composition, depending on geographical location and mining basin.

For the Nord-Pas-de-Calais coal mines :

Spoil heaps still rich in fuel were washed to extract it and direct it to thermoelectric power stations.

Constituents of black and orange shale : $quartz - feldspaths - mica - argiles - oxydes de fer$

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