This paper is a supplementary essay to the previous article on Cornish mining during the inter-war years. After a brief look at the objective position of Cornish mining in the world structure of tin industry, a chronology of the Cornish industry during the World War II when the market conditions changed drastically will be illustrated. During the inter-war years Cornish people tended to seek an industrial policy for the revival of their tin mining but the Government pursued a social policy to moderate social tension caused by unemployment. Then basic attitude of the Government to Cornish mining and the nature of the state aid during the war will be considered. A question as to whether the gap in their way of thinking between local people and the central Government was narrowed during the World War II is the main concern.