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At Boulby near Staithes there is currently a Potash Mine which derives potash (used mainly as fertilizer) and some rock-salt  from the Permian strata at a depth of some 1,100 metres with workings extending nearly 3 km out to sea. It is reported as being the deepest mine in Britain. The website at    www.mining-technology.com/projects/boulby/   provides details of the mine and the workings.

At Whitby museum there is a display of samples from the Permian strata showing the various rocks and minerals.  A selection of photographs were taken of this display and are included in this gallery. The first slide shows a summary of the deep geology in the Whitby area in order to locate the Boulby potash horizons in the Permian with respect to higher strata.