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Metso is investing in the development of energy-saving comminution technology and has signed an agreement to acquire the outstanding shares of its long-term partner Swiss Tower Mills Minerals AG (STM).

Previously, Metso had a 15 percent minority ownership in the company. The parties have agreed not to disclose the transaction value.

Metso decided to exercise its right of first refusal following the divestment decision of STM's other shareholders. As a result of the transaction, Metso's ownership will increase to 100 percent. Metso has reported its previous 15 percent shareholding as a non-current financial asset.

Swiss Tower Mills Minerals, based in Baden, Switzerland, specializes in vertical grinding mill solutions. It is best known for the HIGmill grinding mill, which has been exclusively sold and serviced by Metso. This technology is crucial in modern grinding circuits and integral to the development of energy-efficient comminution processes, for example, in combination with Metso HRCTMe high-pressure grinding rolls.

Over the years of cooperation, the use of vertical grinding mill technology has seen significant growth, and the trend is expected to continue.

"We are excited to have the Swiss Tower Mills Minerals team as part of Metso. For many years, we have collaborated in serving customers in the mining industry. Going forward, our customers will continue to benefit from an unrivaled comminution solutions offering, which we will develop further," said Markku Teräsvasara, president, minerals business area and deputy CEO at Metso.

"Being fully convinced that Metso is highly committed to further develop Swiss Tower Mills Minerals as the benchmark of the art of grinding, together with my private shareholder colleagues, we have decided to divest our ownership in the company. Hence, we are pleased to know that the technology we have established together with Metso for the mining industry will remain an essential part of Metso's flowsheet capability," said Fritz Moser, chairman of the board of Swiss Tower Mills Minerals.

The acquisition, which is subject to the approvals of anti-trust authorities, is expected to be closed in early 2025.

About Swiss Tower Mills Minerals AG

Swiss Tower Mills Minerals AG is an innovative mid-size Swiss engineering company with a vision to revolutionize and continuously improve grinding in the base and precious metals mineral processing industry. The company's vertical mill technology has a rich legacy of more than 50 years in industry, with over 200 fine and ultrafine mills in operation.

Fore more information, visit www.stmminerals.com and metso.com.

This story also appears on Aggregate Equipment Guide.

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