Gearless Mill Drives (GMDs) operate in someof the harshest mining environments, constantly exposed to dust, wa-ter, and slurry. The integrity of their sealing systems is critical, preventing these substances from entering the mo-tor and ensuring long-term reliability and performance. As seals are among the few wear parts of a GMD, properdesign and maintenance directly impact uptime, operational efficiency, and lifecycle costs. This session highlightshow advanced seal engineering protects GMD performance and supports sustainable, trouble-free miningopera-tions, straight from the experiences of Boliden Aitik mine, who has been the first in the world to pilot this newtechnology