Helix Resources has boosted the inferred Mineral Resource at its Gold Basin project in Arizona to 280,000 ounces of gold, underpinning its farm-in strategy and advancing development prospects.
- Updated inferred resource totals 15.37 million tonnes at 0.57 g/t Au
- Resource supports potential low strip ratio open pit mining
- Heap leach metallurgical tests show up to 86% gold recovery
- Helix earning up to 40% interest via staged farm-in JV
- Improved geological confidence and modelling underpin future studies
Significant Resource Upgrade at Gold Basin
Helix Resources Ltd (ASX:HLX) has unveiled a substantial update to the Mineral Resource Estimate (MRE) for its Gold Basin oxide gold project in Arizona, lifting the inferred resource to 15.37 million tonnes at 0.57 g/t gold, equating to 280,000 ounces. This upgrade incorporates results from an additional 239 drill holes, bringing the total drilling database to 644 holes and nearly 50,000 metres. The new resource consolidates Helix’s foothold in a well-established US mining jurisdiction and reflects a marked improvement in geological confidence and mineralisation modelling.
Resource Details and Mining Potential
The resource is split between the Cyclopic and Stealth deposits, with Cyclopic accounting for 12.23 million tonnes at 0.50 g/t Au (195,000 ounces) and Stealth contributing 3.14 million tonnes at 0.84 g/t Au (85,000 ounces). Mineralisation starts from surface and extends to about 150 metres depth, favouring open pit mining scenarios with potentially low strip ratios. The oxide nature of the deposit supports heap leach processing, a low-cost extraction method.
Metallurgical testwork on Cyclopic samples previously reported by Helix showed gold recoveries ranging from 80% to 86% in column leach tests, with low reagent consumption and minimal preg-robbing effects. These results enhance the project’s economic appeal by indicating efficient gold extraction and manageable operating costs.
Farm-In Joint Venture and Strategic Positioning
Helix is progressing a farm-in joint venture with Gold Basin Resources, whereby it can earn up to a 40% interest by spending AUD 3 million over two years. The updated resource estimate forms a critical foundation for Helix’s ongoing exploration and scoping studies, as the company targets further resource expansion and project development. Helix also holds the management role in the JV, with a Joint Venture Committee established to oversee the project.
This resource upgrade follows Helix’s recent formalisation of its 40% stake in Gold Basin and comes amid a broader push to bolster its US portfolio, including the White Hills copper-gold project. The company’s strategy to build scale in the Walker Lane gold trend aligns with the region’s reputation for hosting multi-million-ounce deposits.
Geological Insights and Resource Classification
The Gold Basin deposits are interpreted as low-sulfidation epithermal systems controlled by detachment faults, with mineralisation occurring in broad, gently dipping zones. Despite the significant drilling effort, the resource remains classified as Inferred under the JORC Code due to geological complexity, data quality, and the dominance of reverse circulation drilling. Helix acknowledges that further drilling could upgrade resource classifications and refine economic assessments.
The Mineral Resource Estimate was prepared by independent consultants Mining Associates, using ordinary kriging and constrained by improved geological domains. Bulk density was assigned at 2.4 t/m3, reflecting the oxidised nature of the mineralisation. The company notes that the resource estimate is suitable for preliminary mine planning but not detailed scheduling.
Next Steps and Development Prospects
Helix plans to continue drilling to test extensions to the current mineralisation and explore untested structural targets. The updated resource will feed into early-stage mining and processing studies, including scoping-level economic evaluations. While the project shows promising metallurgy and a sizeable near-surface resource, Helix has yet to demonstrate economic viability or complete feasibility studies.
The company’s progress at Gold Basin will be closely watched as it balances exploration success with the challenges of advancing an inferred resource in a competitive gold market. Upcoming milestones include further drilling results, resource upgrades, and the outcomes of preliminary mining studies that will clarify the project’s commercial potential.
Bottom Line?
Helix’s expanded Gold Basin resource strengthens its US gold portfolio, but the inferred classification and early-stage economics mean further drilling and studies are essential before the project’s value can be fully realised.
Questions in the middle?
- Will Helix upgrade the Gold Basin resource classification with ongoing drilling?
- How will metallurgical testwork scale up in larger pilot programs?
- What timeline can investors expect for scoping and feasibility study results?