One of the mining world's greatest challenges is to effectively use consumables (ie reagents and grinding media) to maximise metallurgical response, while minimising operating costs. It is anticipated that this paper will provide a logical frame work within which this can be achieved._x000D_
The current study, at Perilya's Broken Hill concentrator in the lead primary grinding/roughing circuits, examines the dependency of collector adsorption on Eh. The data demonstrates clearly that under the right grinding chemistry the addition of a xanthate collector during grinding can improve galena flotation._x000D_
Further, operating the ball mill under the desired grinding chemistry regime leads to significant reductions in collector consumption whilst maintaining the metallurgical benefit._x000D_
FORMAL CITATION:Greet, C J, Bruckard, W J and MacKay, D, 2008. Collector - addition point and consumption, in Proceedings MetPlant 2008, pp 287-302 (The Australasian Institute of Mining and Metallurgy: Melbourne).