oa Civil Engineering = Siviele Ingenieurswese - Geotechnical aspects of the development of the Sigma Mooikraal underground colliery
Extracted from text ... GEOLOGY The general area of the proposed mining development is along the eastern flank of a major area of geological upheaval known as the Vredefort Dome Impact site. The Vredefort Dome was formed an estimated 2 000 million years ago when an asteroid some 10 km in diameter hit the earth close the where the town of Vredefort is situated today. The area is primarily underlain by sedimentary lithologies of the Ecca Group of the Karoo Supergroup, particularly those associated with the Vryheid Formation. Dolerite intrusions in the form of sills are generally present in the upper horizons of the Karoo ..
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