A policeman keeps watch outside a South African mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, August 14, 2012. The world's no. 3 platinum producer Lonmin shut down its South African operations on Tuesday and its shares tumbled after violence caused by a feud between rival unions killed nine people at its main mine. REUTERS/Siphiwe Sibeko (SOUTH AFRICA - Tags: CIVIL UNREST BUSINESS CRIME LAW)