Cassiterite NE

The Cassiterite operation is situated within the Pilbara Craton, near Marble Bar — statistically one of Australia's hottest inhabited localities, recording sustained ambient temperatures exceeding 45°C. The terrain is characterised by Archaean granite-greenstone belts with rugged, deeply weathered lateritic profiles. Thermal management of heavy machinery is operationally critical: hydraulic systems, engine cooling circuits, and conveyor drives face accelerated degradation cycles under these extreme conditions, demanding rigorous preventive maintenance scheduling year-round.

Currently classified as Operating, this polymetallic site targets a strategic critical minerals basket — Tin (Sn), Tantalum (Ta), and Lithium (Li). The geographic isolation of Marble Bar creates an acute dependency on local and regional mechanical workshops to minimise unplanned downtime. B2B vendors supplying wear parts, hydraulic components, and electrical assemblies must maintain consignment stock agreements. Without pre-positioned inventory, mean-time-to-repair escalates significantly, directly impacting production continuity and contractual delivery obligations.

A polymetallic Sn-Ta-Li circuit demands a highly engineered primary grinding mill configuration — typically SAG or ball mill — feeding into selective flotation banks with precise pH and reagent dosing control. Tantalum recovery requires dense media separation (DMS) or gravity concentration upstream of flotation. Lithium processing introduces additional physicochemical complexity, requiring spodumene or lepidolite-specific flotation chemistry. Key infrastructure requirements include:

• High-capacity ball/SAG mills with heat-resistant lubrication systems
• Selective flotation cells with automated reagent dosing
• Dense media separation (DMS) units for tantalum pre-concentration
• Thickeners and filtration circuits for multi-product dewatering
• Robust water recycling infrastructure given Pilbara water scarcity

Operating in the Pilbara imposes stringent obligations under Western Australia's Mining Rehabilitation Fund (MRF) and DMIRS environmental conditions. Tailings Storage Facilities (TSFs) must comply with ANCOLD guidelines, incorporating engineered liner systems and real-time geotechnical monitoring. Proactive progressive rehabilitation — concurrent with active mining — is both a regulatory requirement and an ESG differentiator for downstream critical mineral offtakers. Key ESG commitments include:

• Engineered TSF containment with leachate interception systems
• Progressive landform rehabilitation aligned with DMIRS closure plans
• Dust suppression and water management under Pilbara arid conditions
• Biodiversity offset programs for Archaean endemic flora