name, the valley carries a small stream in its lower reaches. At the eastern extremity of the mine (Ordnance...possibly copper minerals. The North vein is of Lower Devonian age, but the Brandy Gill vein is much younger...Commercial Chronical, November 9, 1815; The Durham County Advertiser, December 16, 1815; The London 577 ...“Washington House” in the village of Washington, County Durham (Welcome Library, London: manuscript MS...producing a lower-quality, arsenic-rich metal, and must therefore have attracted a much lower price. No |