Byproducts of china clay mining

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sand

The ratio of waste to usable china clay in Cornwalls earth is one to eight. Meaning in the industry's hay day in the 90's around blah million tonnes of earth were waste product per year.

mica

The sand and mica were industry waste, and originally sent amid the water streams, with white earth run off, turning rivers white

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quartz

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Much of the quartz was used locally in housing projects