1. Origin, formation and classification
The term "coalshale" is associated with coal mining. It is commonly understood as the by-product resulting from the separation of coal from the waste rock that inevitably accompanies its extraction in the mine.
Waste rock is therefore coal shale, and can include materials of different natures, notably sandstone interlayers.
The term "shale" is in fact a misnomer, because in the petrographic sense, shale refers to any geological formation affected by tectonics that has produced schistosity in the material.
1.1 Coal mining
All coal mines are now closed.
To understand the nature of coal shales, we...
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Origin, formation and classification
Nature and physico-chemical characteristics
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