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辽宁省北票市沙金沟金矿床成矿地质特征及找矿预测

Metallogenic Geological Characteristics and Prospecting Prediction of the Shajingou Gold Deposit in Beipiao City, Liaoning Province

  • 摘要: 针对辽西地区黄金矿山探采分离造成后备储量不足等资源危机问题,以沙金沟金矿床①号矿体作为研究对象,在充分吸收已有地质资料基础上,开展成矿地质条件分析,结合激电中梯剖面测量结果提取成矿标志,并根据地质特征建立综合找矿预测模型。依据综合找矿预测模型在矿床外围圈定大好松沟为找矿预测区,采用1∶10 000 地质简测在变闪长岩中圈定1 条断裂,地表可追索长度约1.5 km,通过探槽圈定矿体,金平均品位9.74 g/t,厚度1.44 m;通过激电中梯剖面测量、激电测深研判矿体呈高阻低极化特征,推断矿体向深部具有一定延伸规模;比对综合找矿预测模型认为其具有一定找矿前景。研究成果不仅达到了圈定新的找矿区域的目的,并为已有矿山后续资源增储提供了理论依据及方向。

     

    Abstract: Aiming at the resource crisis of insufficient backup reserves caused by the separation of exploration from mining in gold mines in the western Liaoning region, the No. ① orebody of the Shajingou Gold Deposit was taken as the research object. On the basis of fully absorbing existing geological data, an analysis of the metallogenic geological conditions was conducted. Combined with the results of induced polarization intermediate gradient profile measurements, the ore-forming indicators were extracted. A comprehensive prospecting prediction model was established based on the geological characteristics. Based on the comprehensive prospecting prediction model, Dahasonggou was delineated as a prospecting prediction area in the periphery of the deposit. By means of 1:10 000 geological reconnaissance, one fault was delineated in the metadiorite. The surface traceable length is approximately 1.5 km. The orebody was delineated by exploratory trenches, with an average gold grade of 9.74 g/t and a thickness of 1.44 m. Through induced polarization intermediate gradient profile measurements and induced polarization sounding, the orebody was determined to exhibit high-resistivity and low-polarizability characteristics. The orebody is inferred to have a certain extension scale toward depth. By comparison with the comprehensive prospecting prediction model, it is considered to have certain prospecting potential. The research results not only achieved the purpose of delineating new prospecting areas, but also provided a theoretical basis and direction for subsequent resource reserve augmentation in existing mines.

     

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