Technical Report TR080

Publication: Technical Report TR#080

Date: July 2014

Paper: P1A-052 A Review of Preferential Grade by Size Deportment Data Analysis Procedures and Comparative Ranking Methods



P1A-052 A Review of Preferential Grade by Size Deportment Data Analysis Procedures and Comparative Ranking Methods  (Technical Report TR#080)


Grade Engineering







Abstract text:

Grade Engineering seeks to improve unit metal productivity as a means of delivering system-value to the life-of-mine. This involves a range of integrated technologies and operating protocols for improving effective feed grades through early coarse rejection of low value components prior to energy intensive and costly processing activities. Grade Engineering has the potential to significantly increase value by reducing the cost, energy and water requirements per unit of metal, transforming the economics of large, low grade mining operations. The overall technical and economic aspects of Grade Engineering are detailed in a range of CRC ORE publications.

Four levers are recognized that can drive increased grade of new feed streams as a result of coarse rejection. Improvements in feed quality are an outcome of intrinsic rock characteristics and in-situ heterogeneity, combined with operational integration of the most effective levers. Optimisation involves knowledge of the relative yield-response of specific ore types or domains for each lever. This requires routine laboratory scale testing and production scale surveys to provide results that can be used to populate the resource model with separation attributes. The most common outcome of testing is recognition of specific domains within a resource that are most amenable to a Grade Engineering solution.

The current report outlines the results of laboratory testing specifically for grade by size response. Outcomes are presented using a comparative ranking approach which can be used to benchmark grade by size response within and between deposits, and also to compare opportunity for separation driven by grade by size against other separation levers.




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