Nova Minerals Announces Korbel Floatation Test-work Produces High-Grade Gold Concentrate up to 26.7 g/t Au with Consistent Recoveries Exceeding 95%
Rhea-AI Summary
Nova Minerals (NYSE American: NVA) reported bench-scale rougher flotation results on low-grade Korbel ore as part of Feasibility Study metallurgical work. Low-grade feed of 0.39–0.42 g/t Au achieved >95% gold recovery at ≤250 µm, with only 2–3% mass pull and concentrates grading 14.7–26.7 g/t Au.
Applying coarse particle flotation to the S-K 1300 pit-constrained Korbel resource of 425 Mt at 0.3 g/t Au (4.05 Moz) is expected by the company to improve Estelle project economics by upgrading low-grade ore, reducing processing intensity, and enabling a simpler flowsheet with a smaller CIL plant.
AI-generated analysis. Not financial advice.
Positive
- >95% gold recovery at ≤250 µm with 2–3% mass pull
- Concentrate grades between 14.7 and 26.7 g/t Au from low-grade ore
- Low-grade 0.39–0.42 g/t Au Korbel ore shows strong flotation response
- Korbel resource totals 425 Mt at 0.3 g/t Au for 4.05 Moz
- Potential to remove ore sorting and heap leach from flowsheet
- Ongoing test-work aims to refine flowsheet and project economics
Negative
- Gold recovery drops to 83.6% at 500 µm grind size
- Gold recovery falls to 41.6% at 1000 µm grind size, limiting coarsest grinds
Key Figures
Peers on Argus
NVA was down about 13% while only one monitored peer (ATLX) appeared in the momentum scanner, moving up. With no broad, same-direction peer move, today’s action looks stock-specific rather than a sector-wide rotation.
Historical Context
| Date | Event | Sentiment | Move | Catalyst |
|---|---|---|---|---|
| Jun 22 | Project update & funding | Positive | -0.9% | U.S. redomicile completion, Estelle update, and US$43.4M DoD-funded antimony project. |
| Jun 16 | Redomiciliation complete | Positive | -7.4% | Formal completion of move to U.S. domicile and NYSE American trading plans. |
| Jun 11 | NYSE listing approval | Positive | -7.4% | Approval for NVA and NVAWS listing on NYSE American as a key milestone. |
| May 28 | Funded 2026 programs | Positive | +14.0% | Fully funded 2026 Estelle exploration and development with over US$60M support. |
| May 20 | Conference presentation | Neutral | +4.3% | CEO presentation at Alaska Sustainable Energy Conference highlighting Estelle project. |
Recent Nova news often shows share-price divergence on corporate/redomicile milestones but alignment on funded project and exploration updates.
Regulatory & Risk Context
Reported short interest appears relatively low, suggesting limited squeeze risk and only moderate incremental volatility from short covering alone.
Market Pulse Summary
This announcement highlights bench-scale flotation results with gold recoveries above 95% and a 4.05 Moz Korbel resource within Estelle’s 5.17 Moz inventory. Key watchpoints are feasibility outcomes, flowsheet scale-up, and future economic and permitting milestones.
Key Terms
feasibility study technical
carbon-in-leach (cil) technical
regulation s-k 1300 regulatory
AI-generated analysis. Not financial advice.
Anchorage, Alaska, June 29, 2026 (GLOBE NEWSWIRE) -- Nova Minerals Corp (“Nova Minerals” or the “Company”) (NYSE American: NVA | ASX: NVA) is pleased to report results from bench-scale rougher flotation testing on low-grade Korbel ore, undertaken within a broader Feasibility Study (FS) level metallurgical test-work program. Flotation of low-grade Korbel ore at a coarser-than-conventional grind size has the potential to materially reduce both capital and operating costs while maintaining strong gold recovery.
Highlights
- >
95% Gold Recovery: Low-grade Korbel ore (0.39–0.42 g/t Au) delivered a strong flotation response at 250 µm or finer, producing a low-mass pull of only 2-3% (meaning a 97-98% reduction in the volume going to downstream processing), and a high-grade concentrate of 14.7–26.7 g/t Au (Table 1). - Significant Potential FS Value Upside: Application of coarse particle flotation to the bulk tonnage S-K 1300 compliant pit constrained 425 Mt @ 0.3 g/t Au (4.05 Moz Au) Korbel resource (Table 4) is expected to enhance Estelle’s FS outcomes by upgrading low-grade ore, reducing processing intensity, lowering energy use, improving gold recovery, and simplifying the flowsheet (Figure 2) by potentially eliminating ore sorting and heap leach requirements and allowing a significantly smaller Carbon-in-Leach (CIL) plant.
- Ongoing PFS Optimization: Korbel CIL test-work and further coarse particle flotation studies are underway to refine the flowsheet, confirm high gold recovery and gangue rejection, and optimize plant design, scale, configuration, and overall project economics.
Nova Minerals CEO, Mr. Christopher Gerteisen, commented:
“As part of our ongoing Feasibility Study optimization work, these results represent a major breakthrough in our metallurgical test program. The demonstration that Korbel ore is highly amenable to coarse particle flotation, producing a very high-grade concentrate representing only 2
The successful application of coarse particle HydroFloat technology to our process flowsheet has the potential to deliver substantial reductions in processing and capital costs, while simplifying downstream operations. These improvements could significantly enhance the project's overall economics and increase our ability to profitably recover gold from lower-grade material across the bulk-tonnage Korbel deposit.
Metallurgical test work is continuing to evaluate even coarser particle sizes, which could further improve the project's processing cost profile and strengthen our strategy of maximizing gold production and resource conversion over the life of the mine.”
Korbel Flotation Metallurgical Test-work
The test-work was undertaken on a composite sample generated from diamond drill core from the Korbel Main deposit, representing predominantly fresh sulfide intrusive-hosted ore from an intrusion-related gold system. The sample material was selected from drill holes KBDH-005, KBDH-011 and KBDH-025 over the intervals summarized in Table 2, with the results outlined in Table 1.
Table 1. Bench rougher floatation test-work results
| Test ID | Grind Size µm | Mass Pull % | Au Recovery % | Au Grade g/t | S-2 Recovery % | As Recovery % |
| BF2939 | 150 | 2.05 | 94.9 | 26.7 | 91.2 | 97.0 |
| BF2940 | 150 | 3.18 | 96.1 | 15.1 | 90.6 | 96.7 |
| BF2941 | 75 | 2.79 | 97.7 | 14.7 | 90.7 | 96.6 |
| BF2942 | 250 | 2.67 | 95.9 | 17.2 | 90.3 | 96.6 |
| BF2943 | 500 | 2.82 | 83.6 | 15.8 | 89.5 | 87.6 |
| BF2944 | 1000 | 3.00 | 41.6 | 5.3 | 75.0 | 69.6 |
| BF2945 | 75 | 2.56 | 97.9 | 17.6 | 90.5 | 96.6 |
| BF2946 | 75 | 3.06 | 98.3 | 18.7 | 90.4 | 96.5 |
Table 2. Korbel drill samples used for test-work composite
| Hole ID | Sample ID | Sample ID | From m | To m | From ft | From ft |
| KBDH-005 | A0393009 | A0393118 | 26 | 307 | 87 | 1009 |
| KBDH-005 | B709084 | B709108 | 307 | 309 | 1009 | 1017 |
| KBDH-011 | A0393488 | A0393677 | 6 | 499 | 22 | 1638 |
| KBDH-025 | A0394774 | A0394902 | 258 | 593 | 847 | 1948 |
Table 3. Korbel drill hole locations
| Hole ID | Easting | Northing | Elev (m) | EOH (m) | Azi | Dip | Zone | Assay Results | |
| KBDH-005 | 505300.5 | 6874852.9 | 977.5 | 456.3 | 90 | -45 | Korbel Core | ASX: 19/8/2020 | |
| KBDH-011 | 505288.1 | 6874848.4 | 977.3 | 499.3 | 45 | -70 | Korbel Core | ASX: 19/8/2020 | |
| KBDH-025 | 505276.9 | 6874846.8 | 978.8 | 593.8 | 135 | -45 | Korbel Core | ASX: 26/11/2020 | |
Figure 1 presents the Korbel flotation response across a range of grind sizes, as determined from the metallurgical test-work program, together with the indicative operating windows for available flotation technologies.
Figure 1. Korbel floatation grind sensitivity test-work results
Korbel Coarse Particle Floatation Flowsheet
The proposed flowsheet (Figure 2) demonstrates the potential to fully utilize the Korbel resource by integrating coarse particle flotation for early upgrading with downstream CIL treatment for gold recovery.
Figure 2. High-level conceptual flowsheet for Korbel ore
Table 4. S-K 1300 compliant pit constrained mineral resource estimate – January 2024
| Deposit | Cutoff | Measured | Indicated | Inferred | Total | ||||||||
| Tonnes | Grade | Moz | Tonnes | Grade | Moz | Tonnes | Grade | Moz | Tonnes | Grade | Moz | ||
| Mt | g/t Au | Au | Mt | g/t Au | Au | Mt | g/t Au | Au | Mt | g/t Au | Au | ||
| RPM North | 0.2 | 1 | 4.1 | 0.18 | 3 | 1.6 | 0.15 | 23 | 0.6 | 0.45 | 28 | 0.9 | 0.78 |
| RPM South | 0.2 | 23 | 0.5 | 0.35 | 23 | 0.5 | 0.35 | ||||||
| Total RPM | 1 | 4.1 | 0.18 | 3 | 1.6 | 0.15 | 46 | 0.5 | 0.8 | 51 | 0.7 | 1.13 | |
| Korbel Main | 0.15 | 240 | 0.3 | 2.39 | 35 | 0.3 | 0.3 | 275 | 0.3 | 2.7 | |||
| Cathedral | 0.15 | 150 | 0.3 | 1.35 | 150 | 0.3 | 1.35 | ||||||
| Total Korbel | 240 | 0.3 | 2.39 | 185 | 0.3 | 1.65 | 425 | 0.3 | 4.05 | ||||
| Total Estelle | 1 | 4.1 | 0.18 | 243 | 0.3 | 2.54 | 231 | 0.3 | 2.45 | 476 | 0.3 | 5.17 | |
S-K 1300 compliant pit-constrained resource at a US
Qualified Persons
The information contained in this announcement, relating to metallurgical results, is based on, and fairly and accurately represent the information and supporting documentation prepared by Mr Damian Connelly. Mr Connelly is a full-time employee of METS Engineering who are a contractor to Nova Minerals, and a Fellow of The Australasian Institute of Mining and Metallurgy. Mr Connelly has sufficient experience which is relevant to the style of mineralization and type of deposit under consideration, and to the activity being undertaken to qualify as a Competent Person as defined in the 2012 Edition of the Australasian Code for Reporting of Exploration Results, Exploration Targets, Mineral Resources and Ore Reserves and as a Qualified Person as defined in Regulation S-K 1300 under the Securities Act of 1933, as amended (S-K 1300). Mr Connelly consents to the inclusion in the announcement of the matters based on the results in the form and context in which they appear.
About Nova Minerals Corp
Nova Minerals Corp is advancing one of the world’s largest undeveloped gold deposits into production and securing a US domestic supply of the critical mineral antimony. The Company is focused on the exploration and development of the Estelle Gold and Critical Minerals Project, located in Alaska, a tier-one mining jurisdiction.
Estelle hosts two defined multi-million-ounce gold resources, and more than 20 prospects distributed along a 35-kilometre mineralized trend, in the prolific Tintina Gold Belt, a province which hosts a >220 million ounce (Moz) documented gold endowment and some of the world's largest gold mines and discoveries including, Kinross Gold Corporation's Fort Knox Gold Mine. In parallel, Nova is advancing its critical minerals strategy, fully-funded by a US
Further discussion and analysis of the Estelle Project is available through the interactive Vrify 3D animations, presentations, and videos, all available on the Company’s website www.novamineralscorp.com.
Forward Looking Statements
This press release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange Act which are subject to the “safe harbor” created by those sections. All statements, other than statements of historical fact, contained in this press release are forward-looking statements and that are subject to substantial risks and uncertainties. Forward-looking statements contained in this press release may be identified by the use of words such as “anticipate,” “believe,” “contemplate,” “could,” “estimate,” “expect,” “intend,” “seek,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “target,” “aim,” “should,” "will” “would,” or the negative of these words or other similar expressions, although not all forward-looking statements contain these words. Forward-looking statements are based on Nova Minerals Corp’s current expectations and are subject to inherent uncertainties, risks and assumptions that are difficult to predict. Further, certain forward-looking statements are based on assumptions as to future events that may not prove to be accurate. Forward-looking statements contained in this announcement are made as of this date, and Nova Minerals Corp undertakes no duty to update such information except as required under applicable law.
| Investor Relations: | Nova Minerals |
| Dave Gentry, CEO | Craig Bentley |
| RedChip Companies, Inc. | Director |
| Phone: 1-407-644-4256 | Phone: 1-720-550-4223 |
| Email: NVA@redchip.com | Email: craig@novamineralscorp.com |
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