The most efficient way to produce high-quality metal ore is by using a [[Mining Quarry/en|Mining Quarrymining quarry]]. In about an hour, you can mine about 90 units of ore that will cost you 360 pcs. of [[Low Grade Fuel/en|low grade fuel]]. To search for a high-quality deposits, use a [[Survey Charge/en|survey charge]]. You will be able to find rich deposits of high-quality metal ore in mountainous areas.