PTBA is one of Indonesia's largest coal miners, tons of coal reserves. Its main coalmining concession is located in Tanjung Enim, South Sumatra. It is a stateowned company, with the government as its major shareholder. ... از معدن طلا taun در . اقرأ المزيد . کانادا روی آسیاب معدن توپ . توپ های جعلی برای آسیاب معدن. آ