This book commemorates the work of Jack Trounson, who was one of the leading twentieth-century authorities on Cornish mining and the greatest exponent of its future potential. He had an unparalleled ability to marshal a wealth of detail on the past working of mines and use it to point to places where minerals might still be worked at a profit.The articles collected here were first published during the Second World War but remain an up-to-date guide for historians, prospectors and planners alike. A leading member of the Cornish Instutue of Engineers, the Cornish Mining Development Association, the Cornish Chamber of Mines, and the Trevithick Society, few have done more to preserve the county's industrial past and promote its future prosperity.