Metso, in the face of COVID-19 restrictions, has kept Almonty Industries’ Sandong tungsten project in South Korea on track, completing and delivering the basic engineering work for the crushing and grinding circuit of the process plant.

Almonty said the work was delivered on May 15 and is now under review by the technical team, with approval expected within two weeks.

The overall process flowsheet with process mass balance, equipment list, plant layout drawings, process control philosophy, control diagrams and general technical information were provided after five months of extensive work by Metso, in collaboration with Almonty’s technical team, it said.

Ore characterisation tests on drop weight, bond mill work index, abrasion and crushability were conducted at the Metso laboratories during 2019 and 2020 in order to determine the physical properties, mineral liberation and comminution indices of the ore, which were used as the basis for the design criteria of the equipment for the Sangdong processing plant, it said.

“The Metso equipment selected for the basic engineering is from the world-class product range, which provides for high availability and low operational costs,” Almonty said.

Almonty’s Chairman, President and CEO, Lewis Black, said: “We appreciate Metso and its specialised professionals for their intensive work and dedication in the past months to produce this meaningful basic engineering output, turning its second-to-none experience and expertise in the mining field to the most optimum design criteria for the equipment and process of the Sangdong plant.

“Despite the hardship set by COVID-19, the timely delivery of Metso’s basic engineering work on these critical processing units and long-lead items, such as crushers and mills, will enable Almonty to meet the critical path timeline of the Sangdong project as proposed for the KfW-IBEX Bank project financing.

“The comprehensive and thorough basic engineering work produced by Metso will surely serve as the basis of attaining the performance criteria of the plant guaranteed by Metso.”

Almonty is currently running a pilot plant at Sandong (pictured) to test out the flowsheet on a much smaller scale, but the aim is to build the beneficiation plant this year before moving into tungsten concentrate powder production in 2022.