This report presents the updated mineral resource estimate and preliminary economic assessment for the Omai Gold Property in Guyana, including proposed processing and recovery methods based on historical operating data and limited testwork.
Report context
The Omai Gold Property is located in Potaro Mining District No. 2, Guyana, at UTM PSAD56 Zone 21N 306,500 m E and 601,700 m N, longitude 58° 44' 48" W and latitude 5° 26' 28" N. The technical report, with an effective date of February 8, 2024 and signing date of May 21, 2024, was prepared for Omai Gold Mines Corp. and constitutes an updated mineral resource estimate and preliminary economic assessment (PEA) of the property.
Processing route
Background and historical process
The Omai Gold Mine historically operated using a conventional gold recovery flowsheet. The historical metallurgical process included crushing and grinding, gravity recovery, leaching and gold recovery, and tailings management. The historical process flowsheet was established during previous mine operations and provides the basis for understanding the metallurgical characteristics of the ore.
Mineralogy
The report discusses mineralogy in the context of the historical operations and the current mineral resource estimate. The deposit contains both primary gold mineralization and secondary gold mineralization, with laterite and saprolite zones present at the property.
Historical metallurgical parameters
The historical Omai Gold Mine employed crushing and grinding as the first stage of ore processing. Gravity recovery was utilized as part of the historical flowsheet. Leaching and gold recovery were conducted, with the specific conditions and performance documented from the historical operating period. Tailings management was part of the historical processing operations.
Proposed processing approach
The report outlines a new Omai Gold process for potential renewed operations, described as a proposed design. The new process outline includes crushing and grinding, a gravity concentration circuit, leaching conditions and metallurgical accounting, gold–carbon processes, and CCD (counter-current decantation) and Merrill Crowe gold recovery. Potential variations to the outlined process are also discussed.
The proposed process plant feed would come from open pit mining operations. The report describes tailings and tailings water management as part of the proposed processing scheme, as well as process plant buildings and structures.
Testwork and reasonable expectations
The report provides test recommendations for further metallurgical work. It also states reasonable expectations for renewed processing and recovery, which are based on the historical operating data and the proposed process design.
Key reported parameters
| Parameter | Design / Proposed | Historical Operating Data | Testwork Basis |
|---|---|---|---|
| Crushing and grinding | Included in new process outline | Historical Omai Gold Mine used crushing and grinding | Test recommendations provided |
| Gravity recovery | Gravity concentration circuit proposed | Historical gravity recovery was utilized | Further testwork recommended |
| Leaching and gold recovery | Leaching conditions and metallurgical accounting outlined | Historical leaching and gold recovery were conducted | Further testwork recommended |
| Gold recovery method | Gold–carbon processes and CCD/Merrill Crowe proposed | Historical leaching and gold recovery were conducted | Further testwork recommended |
| Tailings management | Tailings and tailings water management included in proposed design | Historical tailings management was practiced | Not specified |
Project website: https://omaigoldmines.com/
Technical qualifications
The report contains specific limitations that affect the confidence level of the processing and recovery information. The mineral processing and metallurgical testing section (Section 13.0) relies on historical data from previous operations, with the report noting that test recommendations are provided for further work. The proposed recovery methods are described as an outline with potential variations, indicating that detailed flowsheet design has not been finalized. The report states reasonable expectations for renewed processing and recovery but does not provide definitive performance data. The mineral resource estimate is the basis for the proposed processing, and no mineral reserves have been estimated in this report.
Source: Omai Gold Property PEA , 2023 Technical Report, NI 43-101 Technical Report, P&E Mining Consultants Inc. Report 455, Effective Date February 8, 2024, Sections 1.10, 1.13, 13.0, 16.0, 17.0.
