WEST Perth-based oil and gas explorer, Elk Petroleum Ltd, has appointed a new president and vice-president of operations to its Wyoming office. Christopher Mullen, who replaces Bryant Mook as president of Elk Petroleum Inc, is a professional geologist with 20 years’ experience in Rocky Mountains mining. Dennis Brabec, the new vice-president of operations, is a professional Petroleum Engineer and has also gained most of his 35 years’ experience in the area. The company says the appointments will progress opportunities at both the Grieve and Sand Draw South Oil Fields.