 He received an education at Durham College of Science in Newcastle upon Tyne before being apprenticed to William Armstrong, a mining engineer, at Hetton Colliery in Pittington.He was elected a student member of the North of England Institute of Mining and Mechanical Engineers on 13 December 1884 and obtained a First Class Certificate of Competency as a Manager of Mines on 28 October 1887.Redmayne became an under-manager at Hetton before transferring to South Africa in 1891, where he became the manager of Walmsley Collieries near Newcastle, Colony of Natal.