This technical report presents the results of the Kiniero Project Feasibility Study Update, including mineral processing design comprising carbon-in-leach with gold electrowinning and gravity circuits for doré production.
Report context
This Technical Report on the Kiniero Gold Property, situated within the Kouroussa Prefecture of the Kankan Region in the Republic of Guinea, has been prepared by AMC Consultants Pty Limited on behalf of Robex Resources Inc. and is in accordance with the requirements of National Instrument 43-101. The report is an update to the Technical Report with an effective date of 30 June 2023. The effective date for this Technical Report is 6 December 2025, with a report date of 16 January 2025. Currency used throughout this report is United States dollars unless otherwise stated.
Processing route
Proposed plant design
Mineral processing for the Project will comprise carbon-in-leach (CIL) with gold electrowinning, in addition to gravity circuits to produce doré.
Metallurgical testwork
Various metallurgical testwork campaigns have been completed by SMG in support of the Project, relying on sample material selected from the differing deposits, with the purpose of validating historical metallurgical processing plant performance data and determining feasibility study-level design parameters for the process plant.
Canadian-registered independent mineral process engineering consultancy Soutex Inc was appointed in 2022 to increase the level of confidence in the plant design and economic assumptions. The main goals of the 2022-2023 testwork were to identify the leaching conditions and reagents consumption for the plant’s CIL circuit. CIL testing was favoured because previous results (Intertek, 2022) showed better kinetics than direct leaching. The direct leaching route was also studied to validate the premises of faster kinetics using CIL. Additionally, acid mine drainage, gravity concentration, oxygen consumption, and cyanide detoxification were also realized as part of this testwork.
Testwork results
Compared to previous studies, the recent testwork led to reduced leach time and reagent consumption design criteria, combined with new information about oxygen consumption and detoxification parameters. The recovery hypotheses are similar to the 2022 Mining Plus Technical Report, showing a decrease of recovery with depth in the various pits.
Key reported parameters
| Parameter | Unit | Value | Basis |
|---|---|---|---|
| Processing method | , | Carbon-in-leach with gold electrowinning and gravity circuits | Proposed design |
| CIL testing outcome | , | Favoured over direct leaching due to better kinetics | Testwork (Intertek, 2022; Soutex, 2022-2023) |
| Leach time criteria | , | Reduced compared to previous studies | Testwork (2022-2023) |
| Reagent consumption criteria | , | Reduced compared to previous studies | Testwork (2022-2023) |
| Recovery with depth | , | Decrease with depth in various pits | Testwork hypothesis (consistent with 2022 Mining Plus report) |
| Mineral Resource effective date | , | 30 November 2024 | Report basis |
| Gold price for resource reporting | US$/oz | 2,200 | Report basis |
Project website: https://robex.atta.ch/en/our-projects/kiniero-mine/
Technical qualifications
The Qualified Persons have referenced World Bank and other long-term gold price forecast information, prices used in recent NI 43-101 reports, three-year trailing averages, and prices current as of October 2024 for use in pit optimization and cut-off calculations. The gold price selected for Mineral Resource cut-off estimates is considered reasonable by the QPs.
Mineral Resource estimates could be materially affected by significant changes in environmental, permitting, legal, title, taxation, socio-economic, marketing, political, or other relevant factors, although no such changes are expected or known by the QPs.
Mineral Resources are not Mineral Reserves until they have demonstrated economic viability.
Source: Technical Report, Kiniero Gold Project, Guinea, effective date 6 December 2025, report date 16 January 2025, Sections 1.1 and 1.10.
