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MEI Online: Comminution: Latest News: June 15th 2015

 
 

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:: Pre-concentration Technology Wins 2015 CEEC Medal

 

The 2015 CEEC Medal has been awarded to Nigel J Grigg and Georges J Delemontex for their paper titled; “The Pre-Concentration of Precious and Base Metal Deposits Using the InLine Pressure Jig (IPJ); Higher Feed Grades and More Metal,” presented at the International Mineral Processing Conference 2014, Santiago, Chile.

The CEEC Medal is an annual award for the most outstanding published paper, article or case study profiling beneficial strategies for eco-efficient comminution. “The CEEC Medal is intended to bring attention to ‘best-in-class’ research or documentation in the field of eco-efficient comminution. The area of comminution (crushing and grinding ore) provides significant opportunities for improved profit and energy efficiency gains in the mining industry,” noted CEEC Director, Dr Zeljka Pokrajcic.

Nominations for the 2015 CEEC medal came from around the globe. Papers detailing new comminution devices, potential benchmarking indices, full scale grinding equipment comparisons and optimisation, pre-concentration initiatives, and circuit modelling were proposed. The CEEC Medal Evaluation Committee included, for the first time, an independent industry leader to review the nominated papers, assessing aspects such as originality, applicability, supporting research and documentation, prospective impact, potential energy savings, and presentation style

The shortlisted nominations were:

  • Michelle Y Levesque, Dean L Millar. The link between operational practices and specific energy consumption in metal ore milling plants – Ontario experiences. Minerals Engineering 71 (2015) 146–158.
  • Nigel J Grigg, Georges J Delemontex. The Pre-Concentration of Precious and Base Metal Deposits Using the InLine Pressure Jig (IPJ); Higher Feed Grades and More Metal. International Mineral Processing Conference 2014, Santiago, Chile.
  • Grant R Ballantyne, Malcolm S Powell. Benchmarking Comminution Energy Consumption for Improved Efficiency. Mill Operators Conference 2014, Townsville, Australia.
  • Dave Rose, David G. Meadows, Mike Westendorf. Increasing SAG mill Capacity at the Copper Mountain Mine through the Addition of a Pre-Crush Circuit. SME Annual Conference 2015, Denver, USA.
  • Joseph Lessard, Jan de Bakker, Larry McHugh. Development of ore sorting and its impact on mineral processing economics. Minerals Engineering 65 (2014) 88-97.

Although all these papers ranked highly, Grigg’s and Delemontex’s paper on pre-concentration using the InLine Pressure Jig (IPJ) was selected for the 2015 CEEC medal because of the potential impact of pre-concentration in reducing the energy used in comminution, and the paper’s several quantified examples. The paper detailed the installation of IPJs in gold and polymetallic full-scale applications in the 1-15mm size range. The paper reports significant upgrade by the removal of low-grade ores, mainly silicates. The strategy of pre-concentration, either by the removal of gangue material before size reduction, or by separation of material for processing by alternate routes, significantly reduces the energy required for comminution, and decreases operating and capital costs. In addition, it effectively increases the size of the ore deposit. The CEEC Medal selection panel noted an oft-quoted phrase by industry veteran Dr Rob Morrison “The most energy-efficient way to break a rock is not to break it at all.” CEEC and its Board congratulate Grigg and Delemontex on their win, and the other short-listed authors for their important contributions to the cause of reducing comminution energy consumption.

 

 

   

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