郝家河铜矿成矿地质特征及找矿实践

The geological characteristics of Haojiahe copper ore deposit and exploration practices

郝家河铜矿位于滇中盆地砂岩成矿带上,属沉积砂岩型铜矿。河湖交替相是有利于沉积成矿的环境,构造控制矿带的展布,马头山组特别是其中下部郝家河段是主要的含矿层位,矿化发育于浅紫交互带,主要工业矿体产于紧靠浅紫界线的浅色砂岩中,容矿岩石为灰色砂岩、含砾砂岩,其中以渗透性好的砂岩为主,浅紫交互简单、下紫上浅、界线清楚稳定、产状缓则矿化好,矿物分带指示矿体存在位置和矿体富厚中心。根据矿体赋存规律,预测找矿靶区、指导找矿工作,通过实施地质找矿,取得了较好的效果。

Haojiahe sandstone - type copper ore deposit is in the sandstone - type metallogenic belt of Dianzhong basin. Fluvial - lacustrine alternating facies is favorable for forming of sedimentary ore deposits and structure controls the distribution of ore deposits. Matoushan Formation, especially its middle - lower part, Haojiahe Section, is the major hostrock of deposits. The mineralization occurs in pale - violet alternating zone and main commercial ore bodies are hosted by pale sandstone immediately adjacent to the boundary between pale and violet sandstone. Among the hostrocks including grey sandstone, conglomeratic sandstone and shale, the sandstone with good penetrability is the best one. The mineralization is good where there are simple alternation of pale and violet, the pale upper and violet lower strata, clear boundary, and slow attitude. Mineral zone implies the locations of ore bodies and center of rich and thick ore bodies. On the bases of these characteristics mentioned above, we predicted the target and got a successful result after exploration.