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Resource Estimation Using Reverse Circulation and Blasthole Samples in a Bedded Iron Ore Deposit

机译:层状铁矿床中利用逆循环和爆破样品进行资源估算

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Brockman 2 mine is located in the Pilbara of Western Australia and is operated by Rio TintornIron Ore. Mineralisation is hosted by synclines where there is structural complexity to focus fl uidrnfl ow. Mineralisation is hosted by the Brockman Iron Formation. Mining is on 10 m benches andrnblastholes spaced at 6 - 8 m apart are geologically logged, sampled by shovel cuts, and assayedrnusing X-ray fl uorescence for ten chemical variables. Blast blocks are digitised by mine geologists tornassign destinations of material within blasts. Resource evaluation drilling is on a spacing of 50 mrn× 50 m across known mineralisation and consists of recent reverse circulation drilling and olderrnopen hole percussion drilling. Sampling of resource evaluation drilling is by rotary splitters orrnriffl e splitters, and assaying is by X-ray fl uorescence for ten chemical variables. Ordinary krigingrnof resource evaluation produces a long-term resource model. This study examines whether minernplanning would be improved by using a blasthole estimate to extrapolate grades into deeper benchesrnand merging the blasthole estimate with the long-term model made using resource evaluationrndrilling. The two estimates are merged into one model using an inverse weighting based on krigingrnvariance. However, reconciliation results in a test bench show the original estimate made usingrnresource evaluation drilling more closely matches mine geology block outs than does the mergedrnmodel. This is due to a local trend of more high grade and higher iron grades of high grade in thernarea. The blasthole estimate of deeper benches must use extrapolation and it is diffi cult to takernlocal trends into account. In contrast, the estimation using resource evaluation drilling is mainlyrninterpolation and is better able to handle local trends.
机译:Brockman 2矿位于西澳大利亚州的皮尔巴拉(Pilbara),由Rio TintornIron矿石运营,成矿作用由向斜线控制,在向斜线方向上存在着复杂的流体流动。矿化作用由布罗克曼铁矿层主持。在10 m的工作台上进行开采,并在地质上记录相距6-8 m的爆破孔,通过铲切进行采样,并使用X射线荧光分析十种化学变量。矿山地质学家对爆炸块进行了数字化处理,以指定爆炸区域中的物料目的地。资源评估钻探是在已知成矿的50 m×50 m的间距上进行的,包括最近的逆循环钻探和较老的裸眼冲击钻探。资源评估钻探的采样是通过旋转分流器或旋转分流器进行的,而检测是通过X射线荧光分析的,用于十个化学变量。普通克里金诺夫资源评估产生了长期资源模型。这项研究探讨了通过使用爆破孔估计将等级推算到更深的台阶中,并将爆破孔估计与使用资源评估钻孔建立的长期模型合并,是否可以改善采矿计划。使用基于krigingrn方差的逆加权将两个估计合并为一个模型。然而,在测试台上的对账结果表明,与合并模型相比,使用资源评估钻探进行的原始估算与矿山地质区块的产出更加匹配。这是由于当地的趋势,即高温地区铁的品位更高,铁品位更高。较深台阶的爆破孔估计必须使用外推法,很难将局部趋势考虑在内。相比之下,使用资源评估钻探进行的估算主要是内插,并且能够更好地处理局部趋势。

著录项

  • 来源
    《Iron ore 2011》|2011年|p.339-343|共5页
  • 会议地点 Perth(AU)
  • 作者

    C Boyle;

  • 作者单位

    Rio Tinto, Level 8, 152 - 158 St Georges Terrace, Perth WA 6000. Email: cameron.boyle@riotinto.com;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
  • 关键词

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