Dau Tu Khai Thac Va Che Bien Khoang San Kien Thach Joint Stock Company Address: No 600, Dien Bien Street, Civil Group 47, Minh Tan Ward, Yen Bai City, Yen Bai Province Enterprise code: 5200285175 Phone: 0904234078 Representative: Nguyen Ngoc Tu Adress: A3, B2, 27 Cat Linh, Dong Da District, Ha Noi City Minh Tan Ward, Yen Bai City, Yen Bai ProvinceFounding date: 29 - 1 - 2008