大中矿业：公司拥有的硫铁矿主要用于生产工业硫酸，并面向区域市场进行销售
Group 1 - The company has a sulfur iron ore resource of 70.8541 million tons, primarily used for industrial sulfuric acid production [1] - The produced sulfuric acid is sold in the regional market [1]
Group 1 - The company has a sulfur iron ore resource of 70.8541 million tons, primarily used for industrial sulfuric acid production [1] - The produced sulfuric acid is sold in the regional market [1]