Metso Insights Blog Mining and metals blog From ore to dore: Four main processes in gold production
Metals refining
Nov 5, 2021

From ore to dore: Four main processes in gold production

High gold price has increased the focus on the development of refractory gold ores and concentrates. The launch of the compact Elution and Goldroom plant has completed Metso Outotec’s run-of-mine ore to doré process flowsheet and at the same time enabled us to provide a leading standardised solution for the forming of concentrated eluate to be processed for gold recovery by electrowinning.

Today, Metso Outotec can offer processes and equipment that cover the full gold value stream from ore to dore. This includes all three main oxidative processes for the treatment of refractory gold concentrates – BIOX, pressure oxidation, and roasting – as well as the equipment for ultra-fine grinding as a fourth, non-oxidative treatment option.

“Our advanced solutions for processing a variety of gold ore types range from free-milling to refractory gold ores. These solutions include ore sorting, comminution, flotation, refractory ore pre-treatment technologies including bio-oxidation, pressure oxidation and roasting as well as cyanide leaching and gold recovery with analyzers and automation systems. Tailings and effluent treatment are also an integral part of our solution offering,” says Jan van Niekerk, Director for Gold Process Solutions at Metso Outotec.

“During the years, we have participated in several refractory gold projects from conceptual study through to commercial operation. Thus, we have thorough experience and understanding of the specific project drivers affecting technology selection, including CAPEX and OPEX drivers,” concludes van Niekerk.

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