DDH1 Limited, a subsidiary of Perenti Limited, provides specialized surface and underground drilling services to the Australian mineral exploration and mining industry; its core offerings include diamond core drilling for near-mine exploration, mine development, and production activities; reverse circulation and air core drilling for early-stage exploration; grade control, diamond core, reverse circulation, and water bore drilling tailored to the iron ore sector; underground diamond core drilling for development and production in underground mining operations; and drill rig construction alongside sales of rigs and parts. The company operates a fleet of over 180 rigs across brands such as DDH1 Drilling, Strike Drilling, Ranger Drilling, and Swick Mining Services, serving major miners and junior explorers primarily in Australia with offices in Perth and Brisbane, Western Australia; it also supports operations in North America and Western Europe. Founded in 2006 and headquartered at 21 Baile Road, Canning Vale, Western Australia, DDH1 focuses on deep hole multi-intersectional directional drilling, mine engineering drilling, and breakthrough holes for paste backfill, electrical cables, and water pumping. In October 2023, Perenti Limited acquired 100% of DDH1's issued share capital through a scheme of arrangement, integrating it into Perenti's Drilling Services division and expanding the combined fleet to nearly 290 rigs while enhancing capabilities in production and resource definition drilling. This acquisition positions DDH1 within a larger diversified contract mining services group, contributing to Perenti's revenue growth of about 17% in fiscal 2024 and 7% in fiscal 2025.