 By 1779 copper was ousting tin as the main mineral extracted, but it was the period from 1815 to 1840 which was the heyday of mining in Gwennap.This era saw the rise of huge mining enterprises including the Consolidated, United, and Tresavean Mines.Consolidated yielded almost 300,000 tons of copper between 1819 and 1840 which sold for over £2 million.