Khai Thac Khoang San Ham Yen Joint Stock Company Address: Ma Long Hamlet, Phu Luu Commune, Ham Yen District, Tuyen Quang Province Enterprise code: 5000890217 Phone: 0966119866 Representative: Le Tuan Anh Phu Luu Commune, Ham Yen District, Tuyen Quang ProvinceFounding date: 5 - 12 - 2021