Abstract
The Yvan Vézina mill, with a capacity of 1375 t/d, processes a variety of ores from the Beuchemin, Silidor and Mouska mines as well as a pyrite concentrate from the Béliveau mine. These feeds were shown to differ widely in mineralogy, gold content and behaviour during cyanidation. This paper describes a project which was undertaken in 1991 to improve the control of cyanide during gold leaching. The performance of the online analyzer, modifications in circuit parameters and the repercussions observed are discussed. Modification in the leaching practice by addition of lead nitrate and close control of cyanide addition reduced cyanide consumption by 40%. These modifications in leaching practice in combination with a decrease in the particle size of the ore increased gold recovery by 1.7% with an average gold recovery rate of 95.7%.
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