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Geostatistical method was applied to solve the question, if we had done enough drilling to estimate considerably accurate ore reserve figures at the final exploration stage of Kutcho deposit, which is a bedded massive sulfide deposit located in northern B. C., Canada. The accuracy which we required would allow the estimation error less than around 10% in regarding the metal contents in the proposed annual mining area. At the end of 1980, two years final exploratory drilling program was planned after the geostatistical evaluation of the existing drilling results, expecially regarding to design the drilling interval and pattern. On the half way of that program, the results adding new drillings were re-evaluated geostatistically, then concluded we already reached the proposed accurate level and there was no neccessity to continue the rest of the drilling program. After the drilling, ore reserve culculation has been done using Kriging method, and using Inverse Square Distance method for comparison. Then concluded, Kriging method is apparently recognized better than Inverse Square Distance method. And geostatistical evaluation is recognized to be useful for designing the drilling interval and pattern in our case.<BR>Symposia on applying geostatistics to evaluate ore deposits have been frequently held in Western countries, while rarely done in Japan. We hope this report will have a chance to enhance geostatistics more popular in our country.
- 資源地質学会の論文
資源地質学会 | 論文
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