Rahden, Herbert Valentin Richard von2015-08-172015-08-172015-08-17http://hdl.handle.net/10539/18246enMining engineering -- South AfricaMineralogy -- Research -- South Africa.A detailed mineralogical investigation of the Ventersdorp contact reef at Venterspost and Libanon gold mines, West Rand with special reference to the mode of mineralization of this horizonThesis