A comparison between cokriging and ordinary kriging: Case study with a polymetallic deposit |
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| Authors: | Guocheng Pan Dave Gaard Ken Moss and Tim Heiner |
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| Institution: | (1) NERCO Exploration Company, 500 NE Multnomah, 97232 Portland, Oregon;(2) Kennecott Corporation, 10 ES Temple, 84147 Salt Lake City, Utah |
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| Abstract: | Cokriging is applied to the estimation of mineral resources in a polymetallic deposit. Several major steps, which should be taken in using cokriging, are highlighted as necessary practical considerations. The case study is related to an ultramafic copper-nickel deposit. Six elements, Cu, Ni, Au, Ag, Pt, and Pd, occurring in the deposit, are partitioned into three subgroups and the elements within each group are simultaneously estimated on the basis of over 4000 drill assays. A comparison was made between ordinary kriging and cokriging methods through cross-validation. The results show that cokriging has significantly improved the estimates of resources by reducing the overall estimation error by over 15% and the variance of error by over 20%. |
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| Keywords: | cokriging cross-validation polymetallic deposit resource estimation variogram |
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