内蒙古双尖子山银多金属矿床大规模铜矿化的发现及意义

巴林左旗双尖子山超大型银多金属矿床位于大兴安岭成矿带南段, 是亚洲最大银矿。早期研究认为双尖子山矿床主要为中低温热液成矿, 主要经济金属是银铅锌; 随着研究的深入, 发现了少量中高温铜锡矿化。2021年新施工钻孔首次揭露了大规模铜矿化。矿石主要为块状、角砾状、细脉状及稠密浸染状; 矿物组合主要是黄铜矿、黄铁矿、方铅矿、闪锌矿、毒砂和含银矿物。双尖子山矿床大规模铜矿化的发现, 证实了双尖子山矿床是一个从中高温到低温的完整演化序列的大规模岩浆热液型多金属矿床, 铜也可能成为该矿的新增工业矿种。成矿特征和矿体分布规律显示, 该矿区铜矿体尚未完全探明, 深部存在较大铜找矿潜力。

Discovery and Significance of Large-scale Copper Mineralization in Shuangjianzishan Silver-polymetallic Deposit, Inner Mongolia

Shuangjianzishan super-large silver-polymetallic deposit in Balinzuoqi is located in the southern section of the Da Hinggan Mountains metallogenic belt, which is the largest silver deposit in Asia. Earlier studies believed that the Shuangjianzishan deposit consisted mainly of medium- and low-temperature hydrothermal mineralization and that the main economic metals were silver, lead, and zinc. However, with further research, a small amount of medium- and high-temperature copper-tin mineralization was found. The new construction drilling in 2021 revealed large-scale copper mineralization for the first time. Its thickest point is nearly 2 m thick. The ore is mainly massive, brecciated, veinlet, and densely disseminated, and the mineral assemblage is mainly chalcopyrite, pyrite, galena, sphalerite, arsenopyrite, and silver-bearing minerals. The discovery of large-scale copper mineralization in the Shuangjianzishan deposit confirms that it is a large-scale magmatic hydrothermal polymetallic deposit with a complete evolutionary sequence from medium to high temperature to low temperature and that copper may become a new industrial metal of the deposit. The metallogenic characteristics and distribution law of ore bodies show that the copper ore bodies in this mining area have not been fully explored and that great potential for copper prospecting exists in the deep regions.