Using Synergy Between Cyanide, Oxygen, and Lead Nitrate to Improve Extraction and Reduce Opex/Capex in the Processing of Sulphide – Bearing Gold Ores (Disponible en anglais seulement)

6 avril, 2016 | Livre blanc

GUY DESCHÊNES, ing., M. Sc., Ph. D.

Ingénieur, Minéralurgie des métaux précieux

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Abstract

Ce document est disponible en anglais seulement.

In 2013, as the prices of precious metals dropped, investors moved their positions to equity markets for higher returns. As a result, the price of gold dropped further to below US$1200 per ounce, prompting additional substantial outflows from gold investments. In response to lagging gold prices, major gold producers initiated large asset write-downs and cost-cutting programmes. In 2015, this trend continues and gold mining stocks are close to lows not seen since the global financial crisis (GFC) of 2008. In the current economic climate many projects have marginal economics, and the number of projects that have competitive development and production costs is declining. A competitive edge is particularly important with the decreasing grades of orebodies, increasing complexity of the mineralogy, and increasingly demanding environmental constraints. In addition, higher cost producers seek to optimize their process t o reduce operating costs. This paper presents some highlights of three case studies on optimization of gold leaching strategies that improved the economics of brownfield projects. Processing of sulphide-bearing ores was optimized by using the synergy between cyanide, lead nitrate, and oxygen. The outcomes were significant reduction of retention times while maintaining or increasing gold extraction and reducing cyanide addition and effluent treatment costs. A stirred tank reactor experimental programme led to direct implementation of reliable leaching strategies from laboratory scale to production. This approach resulted in savings of $2.2 million to $15.2 million on the three brownfield projects discussed in this paper

Notez que ce livre blanc a fait l’objet d’une présentation lors du IMPC 2016: XXVIII International Mineral Processing Congress Proceedings.

Pour en recevoir une copie, communiquez avec nous par courriel à marketing@bba.ca

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