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FREMANTLE, Australia, July 14, 2025 (GLOBE NEWSWIRE) — EnviroGold Global Limited (CSE: NVRO | OTCQB: ESGLF | FSE: YGK) (“EnviroGold” or “the Company”), a clean-technology company reprocessing mine waste to recover precious and critical metals, is pleased to announce a significant milestone in the development of its NVRO Process™. The Company has completed this phase of the NVRO digital simulation project and in the process, has successfully identified and validated process enhancements that improve both the economic and environmental performance of the NVRO Process™.
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The results, based on test work conducted by ALS Global and modelled using Andritz’s IDEAS™ digital simulation software, are expected to deliver an additional USD 232 million in pre-tax, life-of-mine cash flow (NPV10: USD 140.6 million) for a customer’s tailings project. The improvements include a 35% reduction in feed volume, a 67.6% reduction in concentrate output, and a 2.86x and 4.5x increase in gold and silver concentrate grades, respectively.
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HIGHLIGHTS:
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- Multiple process enhancements were identified through simulations conducted using Andritz IDEAS™ modelling and simulation software.
- Process Improvements have been tested and confirmed with independent testing by ALS Global in Perth, Australia.
- These enhancements are projected to generate additional pre-tax income of USD 29M per annum, or USD 232M over the 8-year life of the project (NPV10: USD 140.6M).
- Feed volume into the NVRO Process™ has been reduced by 35% (confirmed at 36% by ALS Global).
- Gold Recovery in the pre-concentration stage is estimated at 85% (82% based on ALS Global testing).
- Concentrate output has been reduced by 67.6%, from 417.9 kt to 135.2 kt annually, resulting in material savings in logistics and third-party smelting and refining charges.
- Post-processing grades are significantly improved, with gold and silver concentrations increasing by factors of 2.86 and 4.5, respectively, compared to the Sedgman 2023 Preliminary Feasibility Study (PFS).
- Further operating cost reductions are expected from lower reagent, power and consumables consumption.
- Sustainability benefits include reduced water usage and lower greenhouse gas emissions, enhancing the ESG performance and social licence to operate of the NVRO Process™ relative to conventional mining.
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Andritz Process-Optimisation Highlights
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Key Outcomes
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| Metric | 2023 | 2025 | Improvement | ||
| Throughput solids (tph) | 150 (Scaled to 125) | 125 | None – Scaled results to match throughput for comparison | ||
| Pre-concentration mass pull | 100 % | 65 % | 35% less material to NVRO Leach. Smaller plant, lower capex, faster manufacturing and construction. | ||
| Oxidation | >90 % | 96 % | Sulphide Destruction – liberating metal and reducing environmental risk profile. | ||
| Final concentrate grade | Au 5.2 g/t Ag 86.8 g/t | Au 14.75 /t Ag 398.7 g/t | Significantly improved Concentrate value and payability. | ||
| Upgrade factor Gold Silver | 2.86 × 4.50 x | Additional 9.55 g/t Gold in Concentrate Additional 311.9 g/t Silver in Concentrate | |||
| Annual concentrate tonnes | 417.9 kt | 135.2 kt | 282.7 kt less concentrate tonnes p.a. representing a 67.6% Reduction in Concentrate Volume | ||
| Annual gold recovered | 69.9 koz | 64.1 koz | 8% Reduction in Gold offset by lower unit costs and increased metal payability | ||
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Further Economic Benefits from NVRO Process™ Optimisation
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Based on the latest optimisation modelling using Andritz IDEAS™ and laboratory test results from ALS Global, EnviroGold has achieved a substantial increase in concentrate grades compared to the 2023 Sedgman PFS. Gold grades have improved by over 286% and silver grades by 450%. Simultaneously, total concentrate tonnage has decreased by 67.6%.
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