Khai Thac Khoang San Va Thuong Mai Song Thuong Joint Stock Company Address: No 39a, Voi Town, Lang Giang District, Bac Giang Province Enterprise code: 2400494727 Phone: 02043638810 Representative: Dong Tien Dung Adress: No 39a, Voi Town, Lang Giang District, Bac Giang Province Voi Town, Lang Giang District, Bac Giang ProvinceFounding date: 13 - 1 - 2010