铜陵狮子山矿田金的独立与叠加成矿

包村、朝山矿床是狮子山矿田已探明的两个独立矽卡岩型金矿。研究表明，两矿床具脉型金矿化特征；矿石中富含铋矿物，且作为主要载金矿物；Au和Bi明显正相关，按金矿的地球化学分类属铋型金矿。通过狮子山矿田中独立金矿与伴生金矿的对比认为，铋型金矿化不仅可形成包村、朝山独立金矿床，还可在早期(层控)矽卡岩型铜、硫矿床(体)基础上叠加成矿。铋型金矿的叠加成矿应是铜陵地区伴生金矿规模大、品位高且变化大的主因。铋型金矿的查定和研究有重要的理论和实际意义。

Independent and superimposed gold mineralization in Tongling Shizishan ore field

Baocun deposit and Chaoshan deposit,explored recently in the Shizishan ore field,are skarn gold-only deposits.Studies indicate that the gold in the two gold fields is vain-featured.Bismuth minerals,the main gold-loaded mineral,is rich in the gold ore.There is obviously positive correlation between Bi and Au in the ores,and the gold deposits can be defined as Bi-type gold ones in terms of geochemical classification.The comparisons of the gold-only deposits and associated ones in Shizishan ore field show that the Bi-type gold mineralization not only generate such gold-only deposits as Baocun deposit and Chaoshan deposit,but also form superimposed gold deposits by superimposed mineralizing in the earlier skarn copper and sulfur deposits (or ore bodies).The superimposed Bi-type gold mineralization may account for the fact that auriferous deposits in Tongling area are larger in scale and higher in gold tenor than in other areas.Finding and studying Bi-type gold deposit has meanings in theory and practice.