Khai Thac Da Voi Quang Son Joint Stock Company Address: Dong Thu Hamlet, Quang Son Commune, Dong Hy District, Thai Nguyen Province Enterprise code: 4600425562 Phone: 0903409449 Representative: Vu Van Bien Quang Son Commune, Dong Hy District, Thai Nguyen ProvinceFounding date: 22 - 1 - 2008