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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Construction of an expert-opinion-based virtual orebody for a diamondiferous linear beach deposit
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Construction of an expert-opinion-based virtual orebody for a diamondiferous linear beach deposit

机译：为钻石线性海滩存款构建专家意见的虚拟矿体

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摘要

During early-stage diamond exploration projects, hard data underpinning spatial continuity is often very limited. An extreme example of this is a submerged diamondiferous marine placer target area alongside a current onshore mining area in southwestern Namibia. Although an abundance of geological and grade data exists for the adjacent onshore mining area, the target area itself contains no such information. Despite this apparent abundance of data, it is extremely difficult to obtain a variogram (Prins and Jacob, 2014) for use in this study area. The use of traditional simulation techniques is further hindered by the fact that diamond entrapment within the highly gullied footwall is non-stationary. An alternative approach for creating a simulated virtual orebody (VOB) is thus required in order to enable the assessment of sampling strategies. This paper demonstrates how expert opinion is used to generate a composite probability map for diamond concentration using a greyscale hand-sketching technique. The probability map is subsequently calibrated and populated using the diamond distribution for different raised beaches obtained from analog data based on sample results adjacent to the target area. The resultant grade simulation is used to test different sample scenarios and is a first step towards determining an appropriate sampling strategy for the target area. The VOB is used to analyse and rank the efficiency of different sampling strategies for grade determination of submerged diamondiferous linear beach exploration targets.
机译：在早期钻石勘探项目期间，支撑空间连续性的硬数据通常非常有限。这方面的一个极端例子是南部纳米比亚西南部的当前陆上采矿区的淹没的总体海洋置场地区。虽然相邻的陆上挖掘区域存在丰富的地质和等级数据，但目标区域本身不包含这样的信息。尽管存在这种明显的数据，但极难获得在本研究区域使用的变形仪（Prins和Jacob，2014）。传统仿真技术的使用进一步阻碍了高度羽毛脚踏壁内的金刚石夹紧是非静止的事实。因此需要一种用于创建模拟虚拟矿体（VOB）的替代方法，以便能够评估采样策略。本文演示了专家意见如何使用灰度手写技术来生成用于金刚石浓度的复合概率图。随后使用基于与目标区域相邻的样本结果获得的模拟数据获得的不同凸起的海滩的菱形分布校准和填充概率图。结果等级仿真用于测试不同的样本场景，是确定目标区域的适当采样策略的第一步。 VOB用于分析和排列不同抽样策略的效率，以确定淹没的绝地线性海滩勘探目标的级别测定。

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