The contract's terms include an initial three-year period with the option to extend for an additional three years.
Work is scheduled to begin next month, and SRG confirmed it will be providing its complete suite of solutions to the client, including scaffold service and highly skilled rope access technicians, as it also adds about 100 full-time jobs to its worker roster.
"This contract represents a significant advancement in the group's long-term strategy to deliver recurring term revenue within the asset services sector," managing director David Macgeorge said.
SRG became SRG Global in March 2018 when it acquired contractor TBS Group and, six months later, merged with Global Construction Services.
Bauxite mined at the Worsley Alumina complex near Boddington, southeast of Perth, is transported on the largest overland conveyor belt in the southern hemisphere (over 50km). Once at the refinery near Collie, a 100-year-old process turns red bauxite rock into white alumina powder before being railed to Bunbury Port.