Khai Thac Khoang San Dong Phu Joint Stock Company Address: Khu Quan Meo, Lan Luong Hamlet, Dong Tien Commune, Huu Lung District, Lang Son Province Enterprise code: 4900653111 Phone: 02053828941 Representative: Dau Van Duyen Adress: Lan Luong Hamlet, Dong Tien Commune, Huu Lung District, Lang Son Province Dong Tien Commune, Huu Lung District, Lang Son ProvinceFounding date: 5 - 5 - 2011