Khai Thac Va Che Bien Khoang San Thach Son Joint Stock Company Address: Civil Group 44, Yen Thinh Ward, Yen Bai City, Yen Bai Province Enterprise code: 5200490382 Phone: 02163851999 Representative: Nguyen Duc Long Adress: Civil Group 19, Yen Thinh Ward, Yen Bai City, Yen Bai Province Yen Thinh Ward, Yen Bai City, Yen Bai ProvinceFounding date: 8 - 2 - 2010