English China Clays plc

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English China Clays plc or ECC was primarily a mining company involved in the extraction of kaolin, based in St Austell, Cornwall.

Formed in 1919 by the merger of West of England China Clay Co., Martyn Brothers and North Cornwall China Clays. The three companies accounted for around half the output at the time. This merger was subsequently followed by the merger of ECC with two of its main rivals; John Lovering and H D Pochin. This formed the new company English Clays, Lovering, Pochin, & Co. (ECLP & Co. Ltd), subsequently known as ECC International Ltd.

ECC International was acquired by the French company Imetal in 1999, changing its name to Imerys.