Map of the asbestos mining district of Hay in the Northern Cape showing the Dwyka series, Matsap beds, Ongeluk volcanic rocks, the Griquatown beds, the Blink Klip breccias, the Campbell Rand beds, the Kheis series and mineral deposits including alluvium, gravels, sand, limestone and dykes. The map also shows the field cornetcies of Blink Klip, Paarde Kloof and Koegas, Griqua Town commonage, Prieska village, the division of Vryburg and farms with farm names and property numbers.
