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首页> 外文会议>International Workshop on Earth Observation and Remote Sensing Applications >Prospecting specularite-haematite resources with ETM+ and field data, Marampa iron occurrence, northern Sierra Leone
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Prospecting specularite-haematite resources with ETM+ and field data, Marampa iron occurrence, northern Sierra Leone

机译：利用ETM +和现场数据，塞拉利昂北部的Marampa铁矿床勘探苏铁矿-赤铁矿资源

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Marampa iron occurrence in northern Sierra Leone is hosted in the Precambrian of the West African Craton. Several iron ore prospects have been identified here by geological, geophysical and geochemical surveys. The Marampa rock units are dominated by massive beds of specularite-schist interstratified with quartz-micaschist which hosts the specularite-haematite mineralization. In this study, Crosta techniques and Band ratios are applied on ETM+ data to map alteration minerals in Marampa. The results show that, band ratios of 3/1 and 5/4 effectively enhanced areas with ferric-oxide and ferrous-bearing minerals, respectively. Crosta technique on the other hand was effective in mapping areas with hydroxyl-bearing minerals. Alteration anomalies were modeled and overlain with the deposit map of Marampa. The result of the overlay shows that, iron-oxides mapped with the band ratio 3/1 mostly occur within tailings deposits, whilst those (ferrous) mapped with band ratio 5/4 are most consistent with the primary orebody. Six zones of ferric and ferrous anomalies were randomly checked in the field and all occurred in the vicinity of previously mapped iron resources. Rock samples at depths of 2–5m were collected from the inspected ferric/ferrous anomalies for XRF geochemical analysis. Laboratory results for the tested field samples obtained an average feed of 30.7%Fe. This is a 98% correlation to the established 31.2%Fe average grade of the Marampa resource which has a cut-off of 15%Fe as at 2011. It is concluded that, applying band ratios on ETM+ data is effective in prospecting specularite-haematite and in differentiating between ferrous and ferric oxide occurrences.
机译：塞拉利昂北部的Marampa铁矿存在于西非克拉通的前寒武纪。通过地质，地球物理和地球化学勘测，这里已经确定了几种铁矿石前景。马拉帕（Marampa）岩石单元以大量的石英石云母层与石英云母层交织为主，石英云母岩层中蕴藏着奇石岩-赤铁矿矿化层。在这项研究中，将Crosta技术和谱带比应用于ETM +数据，以绘制Marampa中的蚀变矿物。结果表明，3/1和5/4的能带比分别有效地增加了氧化铁矿和含铁矿物质的面积。另一方面，Crosta技术可有效地绘制含羟基矿物的区域。对蚀变异常进行了建模，并覆盖了Marampa的矿床图。覆盖的结果表明，以3/1的能级映射的铁氧化物主要存在于尾矿床中，而以5/4的能级映射的铁氧化物（铁）与原生矿体最为一致。在野外随机检查了六个铁和铁异常区域，这些区域都发生在先前测绘的铁资源附近。从已检查的铁/铁异常中收集了深度为2–5m的岩石样品，以进行XRF地球化学分析。所测试的现场样品的实验室结果获得的平均进料为30.7％Fe。这与已建立的Marampa资源的31.2％Fe平均品位有98％的相关性，该品位截至2011年的品位为15％Fe。得出结论，将带比应用于ETM +数据可有效地勘探苏铁矿-赤铁矿并区分氧化亚铁和三氧化二铁的出现。

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