Swiss Tower Mills Minerals AG was established in Switzerland.
Brand Information
History and Current Ownership
When identifying installed equipment, retain historical references to Swiss Tower Mills, STM, Outotec and Metso.
Swiss Tower Mills Minerals AG was established in Switzerland in 2011, focusing on vertical stirred-milling technology. From 2012, its HIGmill technology entered the mining market through cooperation with Outotec, which later became part of Metso.
Metso completed the acquisition of Swiss Tower Mills Minerals in 2025. Nameplates, contracts, general arrangement drawings and spare part documents may still refer to Swiss Tower Mills, STM, Outotec or Metso. Identify parts using the equipment nameplate, full model, drawing and drawings.
HIGmill technology entered distribution through Outotec's global network.
Metso completed the acquisition, bringing STM into its grinding technology portfolio.
Current Parent Company Metso
Year Established 2011
Location Baden, Switzerland
Main Equipment Family HIGmill™ High-Intensity Grinding Mill
Key Equipment
HIGmill High-Intensity Grinding Mill
Open the Metso / Swiss Tower Mills HIGmill equipment page to explore models, design, wear parts, spare parts and related materials.
Swiss Tower Mills / Metso
HIGmill™ High-Intensity Grinding Mill
Used for fine grinding, ultrafine grinding and regrinding. The current product belongs to Metso; historical equipment and documentation may still carry Swiss Tower Mills, STM or Outotec identification.
Explore HIGmill Equipment → Models and Specifications
Published HIGmill Models
Use the listed models and key dimensions to identify the equipment family. Confirm the installed configuration using the nameplate, serial number, drawing and drawings.
| Equipment Series / Model | Published Key Specifications | Application or Equipment Status |
|---|---|---|
| HIGmill Industrial Range | Chamber volume up to 50,000 L; industrial installation power up to 6,500 kW (Metso current product page) | Current Product Range |
| HIG3500/23000 | Installed power: 3,500 kW; grinding chamber volume: 23,000 L | Industrial Installation |
| HIG500/4000 | Installed power: 500 kW; grinding chamber volume: 4,000 L | Industrial Installation |
| HIG25 | Mobile test equipment; confirm the configuration against the OEM project documentation | Pilot / Site Trials |
| HIG5 | Test equipment; confirm the configuration against the OEM project documentation | Testing / Process Validation |
Equipment series
