Khai Thac Khoang San BK Joint Stock Company Address: Dong Chot Hamlet, Bang Van Commune, Ngan Son District, Bac Kan Province Enterprise code: 4700291337 Phone: 0943909999 Representative: Bui Gia Linh Bang Van Commune, Ngan Son District, Bac Kan ProvinceFounding date: 7 - 9 - 2023