The Telfer deposit and the group of tenements lie within the north-eastern portion of the Yeneena Basin, which is an irregular-shaped sedimentary basin that lies to the east of the Pilbara Craton, west of the Canning Basin, and north-east of the Savory Basin.

The Telfer gold-copper deposit is divided into the West Dome open pit operation and the Main Dome underground operation, including six upper M-Reefs, which form part of the Main Dome mineralization complex and consist of high-grade and narrow, bedding-concordant veins within the deposit.

The geology of the Telfer deposit area consists of a late Proterozoic sequence of marine sediments that have been weakly metamorphosed, structurally deformed by folding and faulting,, and locally intruded by granites.

The Telfer Dome is composed of sedimentary units from the Telfer Formation and the the Malu Quartzite Member. Gold and copper mineralization are hosted within both formations. The Telfer Formation is subdivided into seven units that include mostly sandstones and siltstones. The Malu Quartzite Member is conformably overlain by the Telfer Formation and subdivided locally into five main stratigraphic units, mainly quartz sandstones and altered sandstones. Weathering locally modified mineralization to depths typically up to 200 m, with the the boundary between oxide and primary mineralization being irregular.

The topography at the Telfer mine site is dominated by two large-scale asymm ........

The Telfer operation is comprised of open pit mining at both Main Dome and West Dome and underground mining at Main Dome. Open pit mining is a conventional truck and hydraulic excavator operation. Underground selective and bulk long hole open stope mining methods are used for excavation of the high-grade reefs and Western Flanks respectively, while stockwork ore and waste are mined using sub level cave bulk mining methods. Underground sub level cave mining ore and Western Flanks bulk open stope ore is hoisted to the surface via a shaft.

Open pit mining occurs at the West Dome open pit, via multiple stages named stage 2, 4, 5, and 8. The operation utilises conventional truck and shovel mining on 12 m high benches. Most material mined requires blasting. The primary mining fleet comprises 530 t and 360 t class excavators and Caterpillar 793 (220 t) trucks. Mining is undertaken by a third-party open pit mining contractor under the direction and supervision of Newcrest. Current total material movement is 40 Mtpa, containing 20 Mtpa of ore.

Byrnecut undertake all underground mining activity on the site; from large scale sub-level caving operations to smaller narrow vein high grade reef stopes. The mine has made extensive use in the past of autonomously operated loaders tipping into ore-passes, with chute loaded trucks hauling material on a consolidated haulage level to the main crushing station. Ore is then hauled to surface by shaft. As the mine progresses de ........

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