[Report, 1855 Nov 12, on] The Copper Ore Mines [of Darjeeling] to W. Grey, Secretary to the Government of Bengal, Fort William / A. Campbell. [Titled "Official papers. The Copper Ore Mines. No.640 of 1855". Author was Superintendent of Darjeeling. Report describes traditional copper-mining methods, with extracts from Campbell's diary during his inspection of the mines; discusses future economic prospects for the region and arrangements for re-leasing of the mines]