Abstract We used 2D and pseudo-3D induced polarization (IP) in conjunction with electrical resistivity imaging (ERI) data inversion to identify and characterize potential zones of gold mineralization in Phitshane Molopo area. Reports on historic exploration suggest that gold mineralization is associated with quartz and/or carbonate veins that cut across the banded iron formations. The 2D IP/ERI measurements were acquired along ten 300 m long profiles trending northeast southwest, with 15 m line separation and 7.5 m electrode spacing. Thereafter, we inverted the data using the standard Gauss-Newton optimization method to produce 2D and 3D models. Based on a combination of IP and resistivity results, we identified distinct lithological units comprising the mineralized and non-mineralized zones. High chargeability (≥6.86 mV/V) and high resistivity (≥641 Ωm) anomalies were attributed to the presence of disseminated sulfides or gold-bearing quartz and/or carbonate veins that obliquely crosscut (east west trend) the banded iron formation (BIF) units and the intensely silicified BIF units, respectively. Zones exhibiting a combination of low to intermediate chargeability (1.0–6.86 mV/V) and low to intermediate resistivity (1.4–641 Ωm) are likely non-sulfidized zones with little/no gold mineralization in the study area. The integrated use of IP and ERI methods was successful in delineating zones that are likely to be hosting disseminated sulphides and/or potentially gold-rich zones in the Phitshane Molopo area, Kraaipan Greenstone Belt.

中文翻译：

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综合使用激发极化和电阻率成像方法来描绘博茨瓦纳东南部 Phitshane Molopo 地区潜在的金矿化带

摘要 我们使用 2D 和伪 3D 激发极化 (IP) 结合电阻率成像 (ERI) 数据反演来识别和表征 Phitshane Molopo 地区的潜在金矿化带。有关历史勘探的报告表明，金矿化与穿过带状铁地层的石英和/或碳酸盐矿脉有关。2D IP/ERI 测量是沿着十个 300 m 长的剖面获得的，该剖面呈东北西南走向，线间距为 15 m，电极间距为 7.5 m。此后，我们使用标准的 Gauss-Newton 优化方法对数据进行反演，以生成 2D 和 3D 模型。基于 IP 和电阻率结果的组合，我们确定了不同的岩性单元，包括矿化带和非矿化带。高充电性（≥6. 86 mV/V) 和高电阻率 (≥641 Ωm) 异常归因于浸染硫化物或含金石英和/或碳酸盐矿脉的存在，这些矿脉倾斜地横切（东西向）带状铁地层 (BIF) 单元和分别为高度硅化的 BIF 单元。表现出低到中等带电率 (1.0–6.86 mV/V) 和低到中等电阻率 (1.4–641 Ωm) 的区域很可能是研究区域中几乎没有/没有金矿化的非硫化区。IP 和 ERI 方法的综合使用成功地划定了可能在 Kraaipan 绿岩带的 Phitshane Molopo 地区存在散布硫化物和/或潜在富金区的区域。