(Reuters) – Petra Diamonds Ltd said it would mine about 3.2 million carats in the financial year ended June 2015, an increase of 3 percent from the previous year..The company, which has five producing mines in South Africa and one in Tanzania, said it remained on track to meet its production target of about 5 million carats annually by the 2019 financial year..London-listed Petra Diamonds gets most of its production from five mines it bought from Anglo American Plc's De Beers unit, the world's biggest diamond producer by value.