Tharisa has begun underground operations at its South African platinum group metals and chrome mine. The first underground blast took place this week, and development is now underway. The company already has a well established track record of production from its open pit operations and these will continue for some time yet. But the move underground is designed to secure Tharisa's long-term future, and the company is talking about continuing to mine the reef for 60 years. Phoevos Pourolis, Tharisa's chief executive, joins us to tell us more about the underground development, as well as to talk about sentiment around PGMs and chrome, and the new chrome trading facilities that the company has recently put in place.