Very soon, coprolites were being mined on an industrial scale for use as fertiliser due to their high phosphate content. The major area of extraction occurred over the east of England, centred on Cambridgeshire and the Isle of Ely^[19][20] with its refining being carried out in Ipswich by the Fison Company.^[20] There is a Coprolite Street near Ipswich docks where the Fisons works once stood.