Norwest Minerals Revises Bulgera Resource to 191,000 Ounces with Strong Heap Leach Potential
Norwest Minerals updates its Bulgera Gold Project resource estimate to 191,000 ounces within an optimised open-pit shell, underpinning a promising heap leach development pathway with strong metallurgical recoveries.
- 191,000-ounce revised Mineral Resource Estimate
- 76% of resource classified as Indicated
- Heap leach column testing underway after 86% gold recoveries
- RPEEE pit shell based on A$5,000/oz gold price
- Environmental approvals and scoping study progressing
Revised Resource Confirms Economic Potential
Norwest Minerals Limited (ASX:NWM) has trimmed its Bulgera Gold Project Mineral Resource Estimate (MRE) to 8.7 million tonnes at 0.68 g/t gold for 191,000 ounces, sharply down from earlier tallies but now tightly constrained within an optimised Reasonable Prospects for Eventual Economic Extraction (RPEEE) open-pit shell. This recalibration, assuming a gold price of A$5,000 per ounce, places 76% of the resource in the higher-confidence Indicated category, signalling a more robust technical foundation for project advancement.
The RPEEE shell, developed by Orelogy Mining Consultants, factors in geotechnical parameters, mining costs, and metallurgical recoveries, effectively delineating the economic envelope for potential open-pit extraction. The updated model underscores Bulgera’s viability as a heap leach operation, a low-cost processing route well-suited to the oxide and transitional mineralisation dominating the deposit.
Metallurgical Progress with Promising Recoveries
Fresh rock mineralisation, constituting a smaller portion of the resource, carries a conservative 55% recovery assumption pending further testwork. This cautious estimate reflects the complex sulphide-hosted gold mineralisation typical of deeper zones.
Advancing Scoping Study and Environmental Approvals
Orelogy Mining Consultants leads the Bulgera Heap Leach Scoping Study, integrating recent metallurgical data and refining capital and operating cost estimates with support from MineScope. The conceptual heap leach layout fits within the footprint of historical mining disturbances, potentially easing environmental permitting. MBS Environmental is updating flora, fauna, and vegetation studies to meet current regulatory standards, with fieldwork underway and reporting expected within two months.
Norwest continues to progress key workstreams including process optimisation, borefield development, and broader project engineering. While no Ore Reserves or production targets have been declared, this comprehensive technical groundwork aims to de-risk the project and position Bulgera for subsequent feasibility studies.
Geological Setting and Resource Confidence
Located about 200 kilometres north of Meekatharra in Western Australia’s Plutonic Well Greenstone Belt, Bulgera lies within a prolific gold province. The resource spans several shallow-dipping shear-hosted lodes with mineralisation continuity supported by extensive reverse circulation and diamond drilling campaigns dating back to 1988.
The updated MRE benefits from rigorous geostatistical modelling by Hyland Geological and Mining Consultants, applying ordinary kriging within mineralised wireframes. Drill spacing and data quality support the Indicated classification over most of the resource, although local variability remains a consideration given the deposit’s complexity.
Historical mining from 1996 to 2004 and recent drilling confirm the deposit’s amenability to open-pit extraction, with a selective mining unit tailored to the mineralisation style. Bulk density assignments and metallurgical assumptions have been carefully calibrated to reflect oxidation states and material types.
Capital and Market Implications
This resource update and metallurgical progress come amid Norwest’s ongoing capital management efforts, including a previously reported $3 million equity facility to support Bulgera’s development. The refined resource and heap leach focus could enhance project economics, but investors should note that production remains conceptual and subject to further study outcomes and regulatory approvals.
With formal column leach test results due in August and the Scoping Study to follow, Norwest is poised to deliver critical data points that will shape Bulgera’s next phase. The company’s ability to convert the Indicated resource into Ore Reserves and secure environmental permits will be pivotal milestones ahead.
Bottom Line?
Norwest’s updated Bulgera resource and advancing heap leach testwork lay a solid technical foundation, but key scoping study results and permitting milestones remain to unlock the project’s full value.
Questions in the middle?
- Will column leach testing confirm the high gold recoveries suggested by bottle-roll results?
- How will the Scoping Study refine capital and operating cost estimates for heap leach development?
- What timeline and hurdles remain for environmental approvals within the historical mining footprint?
