pt alar coal mining

PT Gunung Bara Utama- pt alar coal mining ,Introduction. PT Gunung Bara Utama (“GBU”) is an Indonesian coal mining company established in March 2007 with total concession area of 5,350 Ha.INTRODUCTION TO MINING - Ciência VivaINTRODUCTION TO MINING 1.1 MINING’S CONTRIBUTION TO CIVILIZATION ... that can be utilized as fuels,such as coal,petroleum,natural gas,coalbed