£80
Rev. Malachy Hitchins Account of the discovery of silver in Herland Copper Mine (near Gwennap) Communicated by Sir Joseph Banks on the 12th February, 1801. First edition, 1800, published by the Royal Society of London. Herland Mine is believed to have started in 1717 and runs contiguous to Prince George Mine. In 1726, the mine was rich enough to have a 70-inch Newcombe Pumping Engine and was developed to 120 fathoms. 6 pages plus a fold-out map showing the lodes of Herland and Prince George Copper Mines on a plane parallel to the horizon at one hundred and ten fathoms below the surface of the earth. Good condition.
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