耶尔沙瓦菱镁矿是中欧最大的菱镁矿床,在100多年前发现,本世纪初开始用露天开采,目前为地下开采。年产原矿约150万吨。1984年计算的可靠与预测矿石储量为4600万吨,推断储量900万吨。当时捷克斯洛伐克菱镁矿的总储量约9000万吨。菱镁矿赋存于厚达600米的白云岩中, Yershwa magnesite is the largest magnesite deposit in Central Europe. It was discovered over 100 years ago that it was mined in the open air at the beginning of this century and is now being mined underground. Annual output of about 1.5 million tons of ore. The reliable and forecast ore reserves calculated in 1984 were 46 million tons and the inferred reserves were 9 million tons. At that time, the total reserves of magnesite in Czechoslovakia were about 90 million tons. Magnesite deposits occur in dolomites up to 600 meters thick,