Dense Media Separation (DMS), a pre-concentration method
The Halyard team offers proven expertise in the design, engineering and operations of pre-concentration methods, Dense Media Separation (DMS) (best known for the recovery of diamonds and the cleaning of coal streams). You can count on Halyard’s specialist knowledge in numerous of pre-concentration methods, plus the expertise for evaluating the best method to use.
Your DMS Experts
In recent years the DMS process has been employed effectively as a pre-concentration step to improve the recovery economics of various commodities including: platinum group metals, lead-zinc ores, nickel ores, lithium (spodumene) and gold bearing ores. Halyard has successfully applied DMS pre-concentration to a gold process in British Columbia. In addition, Halyard provided a DMS plant to True North Gems and is currently involved in a DMS project for Canada Fluorspar. Prior to working for Halyard, our team worked together on several large and small DMS plants in Africa, Canada and Kazakhstan.
General information on DMS
A DMS plant can be sized from five to ten tons per hour (tph) to a large installation like a 1600 tph plant. The benefit of DMS pre-concentration is the reduction of mining and process operating costs while maintaining economic metal recoveries. The growing adoption of its use associated with other minerals (lead-zinc, copper, gold, potash) reinforces the underlying acceptance of the technology throughout the mineral processing industry.
Motivations for employing the DMS process for pre-concentration include:
- In underground mining, the ability to use bulk mining methods like long hole open stoping as opposed to less efficient and more expensive shrinkage and cut & fill. DMS helps minimize effects of dilution on the Run of Mine (ROM).
- The reduction of the cut-off grade.
- Reduction of project capital by constructing a smaller plant that processes concentrated feedstock only.
- Reduction of operating costs and energy consumption for the project by using a smaller mill to process a large quantity of ROM.
- The reduction of the Cut-Off Grade. Waste material is rejected by the DMS Plant and only mineralized ore is sent to the plant.
- The elimination of dilution and accidental waste in the ROM reporting to the flotation mill.
- The potential provision of a competent backfill material from the DMS floats waste stream.
For more information regarding DMS and its application, please contact us.