The Saraji South cola mine in Queensland. Credit: BHP BHP (ASX, NYSE LSE: BHP) plans to close its Saraji South joint venture coal mine in Australia and lay off about 750 workers amid weak coal prices and high royalties in Queensland, media including the Australian Broadcasting Corporation (ABC) and The Wall Street Journal reported.Saraji is among five steelmaking coal mines operated in Queensland by BMA, a 50-50 joint venture between BHP and Mitsubishi Development Industry, Australia’s largest exporter of s ...