Khai Thac Khoang San Kien Ngoc Joint Stock Company Address: Hamlet 8 (NHA ONG Nguyen DUC Khoa), An Son Commune, Thuy Nguyen District, Hai Phong City Enterprise code: 0201561083 Phone: 02253674421 An Son Commune, Thuy Nguyen District, Hai Phong CityFounding date: 16 - 6 - 2014