1 Apr 2014


More minerals from 1350 metres under Runswick. This time the great green hope of the potash mining industry hereabouts, polyhalite (a mixture of potassium, magnesium and calcium sulphates from the Permian period 260 million years ago). This is the stuff that caused great excitement with its discovery a few years ago, and the substance that Sirius Minerals, trading as York Potash hopes will make the proposed mine on the North Yorkshire Moors outside Whitby economically viable.

Left, polyhalite, right its commercial little brother common rock salt.

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