期刊名称：Issues in Informing Science and Information Technology
印刷版ISSN：1547-5840
电子版ISSN：1547-5867
出版年度：2007
卷号：4
页码：091-104
出版社：Informing Science Institute
摘要：Bauxite is mined and transported by conveyor to a processing plant, screened and washed, then
placed into blended stockpiles to feed the alumina refinery. While being stacked to the stockpile,
the ore is sampled. Completed stockpiles must be acceptably close to target grade (composition),
not only in alumina, but also in residual silica, carbon and sodium carbonate.
The mine is an open-cut pit. Each day the choice of ore to mine, from multiple locations in the
pit, is based upon estimates of grade. Estimated grade, from exploration drilling of the area before
mining, has both systematic and random error.
This paper describes an information system to guide the daily choice of ore to mine. Continually
updating the comparison between forecasts and sampled product, the system provides adjusted
forecasts. Ore is selected to bring the exponentially smoothed grade to target, in each of the control
minerals.
