In 1972 Algy Cluff formed CCP North Sea Associates to bid for North Sea oil licences in the UK sector and subsequently Cluff Oil Ltd, which acted as the management company for CCP. CCP discovered the Buchan Field, the 14th commercial oil field in the UK North Sea, in 1975. He then founded and became Chairman of Cluff Resources plc.
From the early 1980s, Cluff Resources plc began to focus on mineral exploration in Africa and made several significant discoveries including the largest gold discovery in Africa since the Second World War (subsequently the Geita Mine in Tanzania), the Freda Rebecca Mine in Zimbabwe and the Ayanfuri Mine in Ghana, prior to the acquisition of Cluff Resources plc by Ashanti Goldfields Company Limited in 1996. In the same year, backed by Anglo American Corporation, Algy Cluff founded Cluff Mining Limited (subsequently re-named Ridge Mining Limited), which was admitted to AIM in May 2000. Ridge Mining Plc was acquired by Aquarius Platinum Limited in 2009. Algy Cluff was the Founder, Executive Chairman and Chief Executive of Amara Mining Plc from 2004 to December 2010, Executive Chairman until July 2011 and subsequently Non-Executive Chairman up to April 2012, when he stepped down to concentrate on Cluff Natural Resources.