The Pilgangoora pegmatite deposit is one of the largest hard rock lithium deposits in the world.

The Pilgangoora pegmatite district is located within the East Strelley greenstone belt, approximately 30 km east of Wodgina. Three principal pegmatite groups or domains are identified in the centre of the project area: Eastern, Central and South. Pegmatites of the principal domains have a strike length of up to 1.4 km, and mostly range in thickness from 1-30 m, although pegmatites in the Central domain may be up to 70 m thick. Two outlying pegmatite groups, Monster and Southern have strike lengths of up to 350 m and 500 m respectively. Pegmatites strike sub-parallel to the dominant north-northwest trending fabric of the greenstone belt with variable dips ranging from shallow to subvertical to the east.

The pegmatite domains at Pilgangoora are composites of several intrusive phases emplaced sequentially over the duration of the late-stage Turner River orogeny. Lithium grade in the pegmatite domains is subject to two main influences, one primary and the other secondary. The primary ore types comprise mainly coarse spodumene, K-feldspar and quartz, and the abundance of spodumene relative to the other two gangue phases is likely the main control on grade variations in zones grading better than 2% Li2O.
The main modelled mineralised domains are hosted in an area stretching 8,500m (north-south from Lynas Find and Monster down to South End), ranging between 5 ........

Mining operations at the Pilgangoora Operation commenced in October 2017. The mining method currently used on site and proposed for continuing future operations at 6.3Mtpa plant feed rates is selective open pit excavation using drill and blast on 5 to 10m benches and load and haul on 2.5m flitches. 100t to 250t class hydraulic excavators in backhoe configuration loading into 100t to 150t class rear dump haul trucks are used to separately mine ore (pegmatite) and waste (basalt and ultramafic).

Ore contaminated with low to moderate levels of waste is stockpiled for future processing through the ore sorting facility. Blast hole drilling is by tracked rigs enabling pit access from surface contour to pit bottom. The mining method is considered appropriate for the deposit geometry and production rates and has been in use since commencement of mining in 2017. Access is available to all designed pits, waste dumps and stockpiles and the minimum mining width for pushbacks is 40m.

The pit design parameters to achieve stable walls (as determined by geotechnical assessment of the expected rock domains) are:
- For Central, East and Far East deposits: 55° batters in weathered and 75° in transitional and fresh rock domains; benches established every 20m maximum with a minimum berm width of 10m; and 20m geotechnical berms every 100m vertical height;
- For the Monster deposit: 55° batters in weathered and 70° in fresh rock domains: and benches established eve ........

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