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Metso has received the relevant regulatory approvals and completed the acquisition of its long-time partner Swiss Tower Mills Minerals AG (STM) (stmminerals.com). STM’s expertise in vertical grinding mills strengthens Metso’s leading comminution solutions portfolio for the mining industry, playing a vital role in future-proof energy-efficient solutions for the diverse needs of customers and enabling Metso to provide enhanced service levels to customers using stirred mill technology.
“We warmly welcome our colleagues from Swiss Tower Mills Minerals to the Metso team. Our collaboration on innovative grinding solutions and services combining, for example, the well-established HIGmillTM and Vertimill® vertical grinding solutions and HRCTM high-pressure grinding roll technology has yielded significant results for our customers. And now that we are one team, our customers can expect even more,” said Piia Karhu, President, Minerals at Metso.
“Mining customers value Metso’s vast expertise and the comprehensive nature of our technology and services solutions. We see a trend towards optimized technology combinations and multi-stage grinding approaches. These solutions improve energy efficiency and reduce carbon emissions, in addition to enhancing productivity with optimized operating costs. The HIGmillTM is a cornerstone for energy-efficient comminution circuits. Combined with Metso’s innovative flotation solutions like the Concorde CellTM, it enables maximized throughput as well as superior recovery,” stated Christoph Hoetzel, Senior Vice President, Grinding at Metso.
"Swiss Tower Mills Minerals was founded in 2011 with the vision of achieving outstanding grinding performance and unparalleled energy efficiency with vertical stirred mills. Our joint journey with Metso began a year later, in 2012, when Metso was granted exclusive rights to sell the HIGmillTM equipment. Over the past few years, we have built a fantastic team and developed innovative solutions that are now ready to be scaled within a bigger structure. We are delighted that the STM experts and technology will find a new home at Metso,” said Oliver Zlamal, CEO, Swiss Tower Mills Minerals.
Comprehensive stirred mills offering with large installed base
Metso’s stirred milling technologies portfolio consists of Vertimill®, HIGmill™, and Stirred Media Detritor (SMD) mills. These mills are based on gravity-induced and fluidized technologies, allowing for an optimum equipment solution for all comminution circuits in secondary, tertiary, fine, ultrafine, regrind, and lime slaking applications. Metso has over 50 years of experience in developing, testing and delivering stirred mill technology, including a large installed base. Stirred mills are part of the Metso Plus offering.
Metso supports its minerals and metals refining customers with industry-leading end-to-end solutions and services ranging from testing, equipment and digital solutions to comprehensive service and repair center capabilities.
Metso (metso.com) is a frontrunner in sustainable technologies, end-to-end solutions and services for the aggregates, minerals processing and metals refining industries globally. We improve our customers’ energy and water efficiency, increase their productivity, and reduce environmental risks with our product and service expertise. We are the partner for positive change.
Metso is headquartered in Espoo, Finland. At the end of 2024 Metso had close to 17,000 employees in around 50 countries, and sales in 2024 were about EUR 4.9 billion.
Further information:
Piia Karhu, President, Minerals, Metso, T: +358 20 484 100 - E: piia.karhu[.]metso.com.
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helena.marjaranta[.]metso.com 
