Thiess

Thiess is a major international mining contractor with open cut and underground operations. It is jointly owned by unlisted company CIMIC Group (which also owns CPB Contractors) and private equity investor Elliott Advisers.
In October 2022, Thiess acquired Perth-based contract mining and civil service provider MACA.
At the end of 2023, Thiess had 15,500 direct employees globally, including 7,875 in Australia. This included 2,317 MACA employees.
Its WA projects include Fortescue's Iron Bridge mine, Covalent Lithium's Mt Holland mine and BHP's Leinster underground mine.