The gravity concentration circuit was equipped with additional centrifugal concentrators and a hydrocyclone unit which were also installed in the main building extension. An additional cone crusher and screens were installed to reduce recirculation and increase the throughput capacity of the existing SAG mill. This included the installation of an additional crushing circuit comprising of a ball mill and two vibrating screens in the extension of the main building. Polyus has completed a number of initiatives to upgrade the crushing and grinding circuit at Verninskoye. Capital expenditures for the project amounted to some $60 million, in line with the initial budget. ![]() This upgrade is expected to provide an additional 40,000 oz of incremental gold volumes at Verninskoye. The mill has now achieved its target hourly throughput rate of 450 t/h and is currently running at an annualised capacity of 3.5 Mt. ![]() The project,which was launched in the fourth quarter of 2019, has been completed ahead of its initial schedule (the second half of 2021). Mintek expects both the Knelson EGRG and oxygen demand testing services will be commercially available to the industry within six months.PJSC Polyus announces that it has successfully completed the expansion of the Verninskoye mill’s throughput capacity. “To make this service available we need cooperation between the mining houses and Mintek during testing and validation,” she said. Nkabane extended a plea to the gold mining and exploration industry to provide samples and plant data to help expedite the test work, which she said would begin within the next three months. The commissioning and testing of the equipment still needs to be carried out. In addition to this, you can get the gold extraction efficiency, the gold dissolution rate, as well as the lime consumption,” Nkabane explained.Ĭurrently, Mintek is busy with training personnel in collaboration with Air Liquide to use the equipment and interpret its results accurately. “The main information acquired from this test is the oxygen uptake rate and the oxygen uptake efficiency. To address this problem, Mintek entered into a service agreement with gas services and equipment provider Air Liquide to house oxygen demand laboratory equipment to be able to provide oxygen demand testing services to the industry. Nkabane said the sizing of oxygen plants for gold cyanidation plants remained problematic owing to the poor quantification of ore oxygen requirements. Mintek has also acquired oxygen demand testing equipment with the aim of quantifying ore oxygen requirements. Nkabane requested gold mining and exploration companies to contribute further to the test work by contributing more samples for testing. She said the data acquired from the testing could be used to model, upscale and predict the performance of gravity circuits. Moreover, the liberation characteristics of the EGRG can be obtained from the test,” she explained. ![]() “The benefits compared to the gravity amenability testing equipment that we have is that the progressive grinding minimises the over-grinding of particles and smearing of coarse precious metals. The final tailings were also analysed for gold. The concentrate of each stage was then analysed for gold and particle size distribution. The grind size was progressively reduced as the stages progressed. The test was being carried out in three concentration stages, where each stage was preceded by grinding to a specific grind size. Nkabane said the setup for the Knelson EGRG circuit consisted of a rod mill, a screen and the Knelson concentrator. She explained that the objective of the testing was to quantify the amount of EGRG that can be recovered from the ore. She said Mintek was at the development stage of conducting testing and validation of the Knelson EGRG.
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