202-hour continuous production campaign generated engineering, operating and commercial data supporting future deployment of the NVRO
Source: NVRO Metals Limited
August 28, 2026 06:00 ET
NVRO Metals Advances
Commercial Deployment of
the NVRO Process™ Through
Successful Continuous
Production Demonstration on
Hecla Greens Creek Material
202-hour continuous production campaign
generated engineering, operating and commercial
data supporting future deployment of the NVRO
Process™
VANCOUVER, British Columbia, Aug. 28, 2026 (GLOBE NEWSWIRE) -- NVRO Metals Limited (TSXV:
NVRO | OTCQB: ESGLF | FSE: YGK) ("NVRO Metals" or the "Company") is pleased to announce the
successful completion of a continuous production demonstration campaign using material from
Hecla Mining Company's Greens Creek operation in Alaska as announced on 22 April 2026.
The campaign forms an important part of the Company's collaboration with Hecla Mining Company
to evaluate the NVRO Process™ as a potential commercial processing solution for Greens Creek
tailings material. The campaign successfully demonstrated continuous operation using customer
feedstock under representative operating conditions and generated engineering, operating and
metallurgical data to support future commercial deployment and investment decisions.
Highlights
Successfully completed 202 hours of continuous operation on Hecla Greens Creek material.
Campaign was preceded by 57.5 hours of commissioning and process stabilization.
Continuous operation was consistent with the Company's IDEAS™ digital process model.
Approximately 97% sul de oxidation achieved during the campaign.
Approximately 70% reduction in solids mass achieved during leaching.
Preliminary operating results indicate:
approximately 10.6-times silver upgrading from otation feed to NVRO Process™ leach
product;
approximately 10.8-times gold upgrading from otation feed to NVRO Process™ leach
product;
Full independent laboratory assays and complete metallurgical reconciliation remain in
progress.
For more information, including important assumptions and requirement for independent
accredited testing to be completed, see "Basis of Reported Grades and Comparability" below;
Operational indicators are in line with the Company’s IDEAS modelled performance with
process optimization continuing;
The Greens Creek tailings are known to contain additional metals including zinc, copper and
other critical metals. The recovery of these metals is being assessed as part of this campaign.
Advancing Commercial Deployment
The successful completion of the continuous production demonstration represents an important
milestone in the commercialization of the NVRO Process™ and demonstrated continuous
operations of the complete integrated process using customer feedstock under representative
operating conditions.
Management believes the successful campaign substantially reduces technical risk associated with
future commercial applications of the NVRO Process™ and strengthens the Company's ability to
progress discussions with mining companies seeking alternative processing solutions for complex
sul dic tailings and ores. The campaign was intended to support the evaluation of a 35,000t
commercial processing trial under the parties' Memorandum of Understanding (announced 8 July
2026).
Demonstrating Stable Continuous Operation
The principal objective of the campaign was to demonstrate the oxidation and recovery
performance following continuous operation of the integrated NVRO Process™ using customer
material under representative operating conditions.
The campaign was undertaken using the Company's μ NVRO Production Demonstration Plant,
which forms part of the Company's Rapid Deployment Pathway for evaluating customer feedstocks
prior to commercial deployment. During the campaign the plant operated continuously for 202
hours, following 57.5 hours of commissioning and process stabilization, while maintaining operating
conditions consistent with those predicted by the Company's IDEAS™ digital simulation model.
Calculated sul de oxidation of approximately 97% indicates effective oxidation of refractory sul de
minerals and liberation of metals contained within them. Operational observations throughout the
campaign were consistent with the Company's engineering expectations and exceeded previous
pilot results. Management believes the campaign demonstrates that the chemistry, process control
and operating philosophy developed through laboratory and pilot testing translate effectively to
continuous operation.
Management believes the continuous operation supports an internal assessment that the NVRO
Process™ has reached Technology Readiness Level 7. The next step in the Company’s process
development is expected to be the installation of a full-scale industrial plant, advancing through
subsequent TRL stages toward TRL 9, representing proven commercial operation. The Company
has announced its proposed acquisition and development of the NVRO Metals Hub as the location
for future commercial operations as announced 10 June 2026.
Preliminary Precious Metal Upgrading
Preliminary operating results indicate continued upgrading of precious metals through the NVRO
Process™. Compared with the calculated otation feed grade:
Silver upgraded from approximately 169 g/t to 1,795 g/t, representing an overall upgrade of
approximately 10.6 times.
Gold upgraded from approximately 1.51 g/t to 16.3 g/t, representing an overall upgrade of
approximately 10.8 times.
The campaign also achieved approximately 70% reduction in solids mass during leaching.
These preliminary results are reported alongside those from the March 2026 bench-scale campaign
for reference. As previously disclosed, the March and August campaigns were conducted on
different samples of Greens Creek material and should not be interpreted as directly comparable
measures of process improvement.
Table 1: Preliminary silver and gold grades and upgrade ratios, March 2026 Bench Scale Test
compared with the August 2026 Campaign.
Stage Silver (g/t) Gold (g/t)
March
2026
August
2026
March
2026
August
2026
Flotation feed (calculated head) 98 169 0.99 1.51
Flotation concentrate 266 725 2.90 5.87
NVRO Process™ leach residue 554 1,795 6.54 16.3
Upgrade: feed to otation concentrate 2.7x 4.3x 2.9x 3.9x
NVRO Process™ Upgrade: concentrate to
residue
2.1x 2.5x 2.3x 2.8x
Total upgrade: feed to residue 5.7x 10.6x 6.6x 10.8x
The grades and upgrading ratios reported in this announcement are based on assays undertaken
by Nagrom based on a subset of feed and end product samples. Independent laboratories continue
to analyze samples collected throughout the campaign. Following receipt of the complete
analytical dataset, the Company expects to complete full metallurgical reconciliation and release
nal results.
Next Steps
Following receipt of the remaining laboratory assays, the Company expects to:
complete metallurgical reconciliation of the campaign;
advance engineering and operating data;
continue process optimization;
produce representative product samples for downstream evaluation;
and continue discussions with Hecla regarding the next stage of the evaluation program
under the parties' Memorandum of Understanding.
Grant Freeman, Chief Executive Of cer, commented: "Successfully completing continuous operation
over 200 hours is an exceptional milestone achievement and a demonstration of the integrated
NVRO Process™ using customer feedstock. I would like to thank the entire team for their
dedication to this goal.
The consistency of the operating performance and the preliminary metallurgical results give us
con dence that the process is performing in line with our engineering expectations. We now look
forward to receiving the balance of the independent laboratory results."
About NVRO Metals Limited
NVRO Metals Limited is a clean technology company focused on the recovery of precious, base and
critical metals from refractory sul dic ores, concentrates and tailings. Through its proprietary NVRO
Process™, centralized processing infrastructure and commercial deployment strategy, the
Company is building a scalable critical minerals production, processing and recovery platform
centred on the NVRO Metals Hub in Australia's Northern Territory while advancing customer
programs and strategic partnerships internationally.
For further information, please contact:
Grant Freeman,
Chief Executive Of cer
Investor Relations,
Investor Cubed +1-647-258-3310
Forward-Looking Statements
Certain statements in this news release constitute forward-looking statements within the meaning
of applicable Canadian securities legislation, including statements regarding pending assay results,
the preliminary grades and upgrade ratios reported and their con rmation by independent assay,
expected upgrading of metal grades, continued process optimization, the achievement and timing
of TRL milestones, the application of campaign data to the NVRO Process™ digital model, the
Company’s acquisition of the assets underlying the NVRO Metals Hub and future full-scale
installation at the NVRO Metals Hub. Forward-looking statements are based on management’s
current beliefs and assumptions and are subject to known and unknown risks and uncertainties
that could cause actual results to differ materially, including the risk that equipment or processes
do not operate as anticipated, that assay results differ from operational indicators or from the
preliminary grades reported in this news release, that the calculated head grade used to derive the
upgrade ratios differs from grades determined on con rmatory assay, that feed material variability
may affect results at different scales or locations, that the Company may not secure the nancing
required for a full-scale plant, that required permits and regulatory approvals may not be obtained
or may be delayed, and that quali cation milestones are not achieved within anticipated
timeframes or at all. Readers are cautioned not to place undue reliance on forward-looking
statements. The Company assumes no obligation to update any forward-looking statement except
as required by law.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is de ned in
the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of
this release.