The Mt Webber deposits (Fender, Daltons, Gibson, and Ibanez) are hosted by greenschist facies, steeply dipping, isoclinally folded, quartz magnetite BIF within the Pincunah BIF member in the North Shaw greenstone belt. The greenstone belt comprises Warrawoona Group mafic and ultramafic rocks that are unconformably overlain by rocks of the upper Sulphur Springs and Soanesville Groups; these rocks are flanked by the Shaw Granitic Complex to the east and south. BIF units within the Pincunah BIF member display tight, shallowly NE-plunging fold hinges, with shear zones and faults located along fold limbs. The iron ore deposits are located in the fold-thickened hinge areas of tight synclines. Supergene goethite ± martite ores are flat lying, superimposed on the steeply dipping BIF, and extend from surface to depths of <80 m. The deposits are <900 m long and <600 m wide, narrowing rapidly away from fold hinges to <50 m wide. Supergene goethite ± martite ores (<60 wt% Fe) are massive textured, cavity-rich, and display goethite replacement of primary quartz bands. A 1-3 m thick surface horizon of nodular laterite locally blankets flatlying areas of ridges.

The mining approach to the Mount Webber deposit is by conventional open pit mining methods using drill and blast methods. Mined material is mined in 6 m-high benches. The blasted rock is loaded across two 3 m-high flitches by backhoe excavators into rigid body trucks.

The contractor provides the mining and processing equipment, completes operations and maintenance activities. The mining of ore at Mt Webber is contracted to BGC Contracting Pty Ltd (now NRW Contracting Pty Ltd).

Stage 1 mining at Mt Webber began in July 2014 at a rate of 3 Mtpa. In late 2014 mining increased to 6 Mtpa following completion of Stage 2 developments. Production increased to approximately 9 Mtpa beginning in August 2017. Mining was reduced back to 7.8 Mtpa between November 2017 to February 2018 before increasing again to approximately 9 Mtpa thereafter. As at August 2020 the Mt Webber mine life is estimated to be 2.5 years depending on future mine plans and ultimate production rates.

Ore and waste is differentiated through grade control practices and ore is trucked to the run-of mine (ROM) stockpile. Ore is segregated into grade categories, namely:
• H0 - +60% Fe
• H1 – 57.5 to 60% Fe
• H2 – 55 to 57.5% Fe (Ibanez and Fender)
• H2 – 53.5 to 57.5% Fe (Gibson/Daltons)
• H3 – 53.5 to 55% Fe (Ibanez and Fender)
• H3 – 50 to 53.5% Fe (Gibson/Daltons).

Material is classified as waste when the grade is below 53.5% Fe for Ibanez and Fender and below 50% Fe for Gibson/Daltons.

The LOM strip ratio is 1 : 0.32 (ore t : waste t).

The Mt Webber is mining at a rate of approximately 9 mtpa. Approximately 7 mtpa of ore is crushed on site. The remaining tonnes are transported by road to the Mount Dove processing facility for crushing.

The processing plant at the Mount Webber site was commissioned with a capacity of 6.0 Mt per year and it regularly achieves levels of 7.0 Mt per year.

The ROM ore is fed into a primary crusher and then through one of two circuits to produce Lump or Fines material in a crushed cone.

The Mount Dove crushing facility has been used to process approximately 2.0Mt per year of Mount Webber run-of-mine ore.

The crushing of iron ore direct shipping ore at Mt Dove is contracted to MACA Mining Pty Ltd.

Ore is hauled by contractors from the mine site to the Utah Point terminal.