C.O. Schmitt was a member of the South African Association for the Advancement of Science by 1906 and was still a member in 1910. He resided in Johannesburg and published a paper on 'Future economies in Rand reduction plants' in the Journal of the Chemical, Metallurgical and Mining Society of South Africa (1911, Vol. 12(1), pp. 16-30). Around the same time he was one of the contributors to A textbook of Rand metallurgical practice, by R.S.G. Stokes* (1912). In 1913 he served on the Editorial Committee of the South African Institute of Engineers.