Khai Thac Che Bien Khoang San Earthly Gems Joint Stock Company Address: Luc Nong Civil Group, Hong An Ward, Hai Phong City, Viet Nam, Hai Phong City Enterprise code: 0202323500 Phone: 0911258558 Representative: Hoang Van Thanh Hai Phong CityFounding date: 25 - 11 - 2025