Khai Thac Hoang Nghia LTD Address: Tan Vinh Civil Group, Luong Son Commune, Tinh Phu Tho, Viet Nam Enterprise code: 5400572473 Phone: 0969264666 Representative: Hoang Van Hieu Luong Son Commune, Da Bac District, Phu Tho ProvinceFounding date: 10 - 7 - 2026