Khai Thac Khoang San Hoang Phuong Address: No 43, Khu 3, That Khe Town, Trang Dinh District, Lang Son Province Enterprise code: 4900669707 Phone: 02053883028 Representative: Hoang Van Siu Adress: No 43, Khu 3, That Khe Town, Trang Dinh District, Lang Son Province That Khe Town, Trang Dinh District, Lang Son ProvinceFounding date: 10 - 8 - 2011