加纳Adansi Gold有限公司Asuadai矿床普通克里格估算与多指标克里格估算比较

S. Al-Hassan, E. Boamah
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引用次数: 1

摘要

Adansi Gold Ghana Ltd从当时的Resolute Amansie Ltd接管,拥有三个主要的历史矿床:Nkran、Adubia、Abore和一个新矿床Asuadai。该公司现在希望对Asuadai的资源进行评估,该资源距离Nkran矿床约7.5公里,该矿床使用了普通克里格(OK)方法进行估计。估算结果表明,对吨位和品位的低估是一致的。线性估计模型(如OK)通常会产生很好的估计,但在样本分布高度偏斜的情况下,估计可采储量可能会遇到问题。多指标克里金法(MIK)是一种比较流行的非线性方法,可以处理黄金品位等偏态分布,解决了线性方法的一些不足。对比了苏华岱金矿的MIK和OK估算结果,认为MIK的估算结果优于OK,建议将MIK应用于苏华岱金矿及类似地质背景的其他矿床的黄金资源估算。关键词:指标克里格,普通克里格,变异,金,离群值
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Comparison of Ordinary Kriging and Multiple Indicator Kriging Estimates of Asuadai Deposit at Adansi Gold Ghana Limited
Adansi Gold Ghana Ltd has taken over from the then Resolute Amansie Ltd and has three main historical deposits: Nkran, Adubia, Abore, and a new deposit, Asuadai. The company now wants to evaluate the resources at Asuadai which is about 7.5 km from Nkran deposit where Ordinary Kriging (OK) method had been used for estimation. Results of the estimation showed a consistent underestimation of tonnage and grade. Linear estimation models such as OK often produce good estimates but may encounter problems estimating recoverable reserves in cases where the distribution of samples is highly skewed. Multiple Indicator Kriging (MIK) is one of the popular non-linear methods that can handle skewed distribution such as that for gold grades, and addresses some of the deficiencies of the linear methods. This paper compares the estimation results obtained by using MIK and OK for the Asuadai deposit and establishes that MIK presents a better estimate than the OK, and recommends that MIK be used to estimate the gold resources of the Asuadai deposit and other deposits with similar geological settings. Keywords: Indicator Kriging, Ordinary Kriging, Variography, Gold, Outlier
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