Thiess has secured two five-year mining contracts in Mongolia, covering both underground services and asset management at major sites.
The agreements encompass work at Oyu Tolgoi Mine managed by Rio Tinto and the Ukhaa Khudag Mine operated by Energy Resources.
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As part of the contract at Oyu Tolgoi, the company, via the Thiess-Khishig Arvin joint venture (TKAJV), will be responsible for various underground mining activities.
The scope includes underground development, ground support installation, and construction of block cave infrastructure.
The Oyu Tolgoi contract is anticipated to generate more than 110 new positions in the coming months.
Headcount is expected to rise to nearly 800 employees by the end of the contract period, making it Thiess’ biggest underground mining operation worldwide.
Thiess has maintained a presence at the Oyu Tolgoi site since 2016, operating through its joint venture.
In a separate agreement, Thiess will deliver Coal Handling and Preparation Plant (CHPP) asset management services at Ukhaa Khudag for Energy Resources.
The work will involve asset management, technical support, supply chain management, and planning to promote efficient plant operations.
Thiess executive chair and CEO Michael Wright said: “These awards demonstrate the trust our clients place in Thiess and reflect the strength of our long-standing partnerships with Oyu Tolgoi and Energy Resources, as well as the capability of our team.
“Our success is built on our global expertise, our local people and our local capability, and we’re proud these contracts will create new career opportunities as our workforce grows.”
Thiess entered the Mongolian market in 2007. Since then, the company has provided mining and maintenance services across multiple projects in the country.
In June 2025, Thiess announced a contract extension valued at A$2.3bn ($1.5bn) over three years at Jellinbah Group’s Lake Vermont mine in Queensland’s Bowen Basin.
