Khai Thac San Xuat Va Xay Dung Huyen Van Yen Joint Stock Company Address: Hamlet 2, Dai Phac Commune, Van Yen District, Yen Bai Province Enterprise code: 5200275177 Phone: 02166542389 Representative: Nguyen Manh Luong Adress: Civil Group 5, NT Tran Phu Town, Van Chan District, Yen Bai Province Dai Phac Commune, Van Yen District, Yen Bai ProvinceFounding date: 2 - 7 - 2007