The Bushveld Complex, which includes the largest known mafic intrusion in the world, reveals some spectacular geology, including the classic layering of dark ultramafics and light-colored anorthositic rocks (Fig. 1). Three distinct groups of rocks make up the complex (Tankard et al., 1982), the oldest of which is the Rooiberg Group (dominated by rhyolite) and the youngest, the Lebowa Granite Suite (including a suite of granophyres). The majority of the ore deposits are, however, restricted to the intervening group of ultramafic-mafic rocks, or Rustenburg Layered Suite. The Rustenburg Layered Suite is intrusive into the sedimentary rocks...
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