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Backed by means of The Extraction and Processing department (EPD) of TMS, The Mineral and Metallurgical Processing department (MPD) of SME, Metallurgical Society (MetSoc) of CIM 2003 TMS/EPD Fall assembly held along side thirty third Annual Hydrometallurgy assembly and 2003 convention of Metallurgists Vancouver BC Canada August 24-27,2003.Content:

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Turner (New York, NY: Wiley and Sons, 1995), 45-102. 24. W. J. Morgan, Aquatic Chemistry. , 1990), 252-348. 25. E. Hrudey, W. G. Rousseauy, Bioavailability in Environmental Risk Assessement, (New York, NY: Lewis Publishers, 1996). 26. Guideline for Contaminated Sites in Ontario (Toronto, Ontario: Queen's Printer for Ontario, 1997). 27. Filgueiras, I. Lavilla and C. Bendicho, "Chemical sequential extraction for metal partitioning in environmental solid samples", J. Environ. , 4 (2002), 823-857. 28.

Of those new processes that have lead to the construction of commercial-scale projects, how have these worked out technically? There are four very good papers that I know of on this topic. C. E. Katrak [2], and was originally prepared as a study for The World Bank, in 1979. e. smelters and refineries). Figure 1 below is from their paper, as summarized in E&MJ [3], and shows the data for new processing plants. This information includes both some standard and some new or innovative processes. There is a large amount of scatter, but none of the plants were at design 1092 Time (mm start-up (yen) Figure 1: Production from New Processing Plants during the First Four Years after Startup.

And certainly current prices, as of the writing of this paper, have not increased. We obviously have to get smarter just to keep in business - and to keep supplying society the metals that we all require for our continued economic well-being. If we are not successful in developing new technology to deal with lower and lower grade ores and to reduce costs, we will eventually all be back living in caves and eating with our fingers. We have been tremendously successful in the past with the development of new hydrometallurgical processes.

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