Mr. Rick Howes reports

REUNION GOLD ANNOUNCES POSITIVE METALLURGICAL TEST WORK FOR ITS OKO WEST PROJECT IN GUYANA

Reunion Gold Corp. has released the preliminary metallurgical testwork results for its Oko West project in Guyana. The results were produced from recent metallurgical testing programs completed by Base Metallurgical Laboratories in Kamloops, B.C.

• Gold extraction for gravity leach averaged 94.4 per cent (fresh rock), 96.5 per cent (transitional material) and 97.5 per cent (saprolite);
• Primary grind size of P80 at 75microm resulted in the best gold extractions on average;
• Results indicate a deposit with a medium level of hardness, which is typical of other deposits in the Guiana Shield region.

Rick Howes, president and chief executive officer of Reunion Gold, commented: "I am pleased with the results of the testwork which continue to confirm the robustness and strong economic characteristics of the Oko West deposit, on which we released our maiden mineral resource estimate (MRE) in June (see June 13, 2023, MRE press release). These results represent one of many studies that will comprise our preliminary economic assessment (PEA), which we expect to release by the end of 2023 or early 2024. In addition to advancing work on the PEA, the company's ongoing drilling program aims at expanding the resource at depth below the MRE area. We also intend to continue our exploration program outside of the resource area to try and identify additional areas of gold mineralization at Oko West. The most promising targets include the southern four km of the same geological trend that hosts the Kairuni zone MRE, and the zone to the west of the resource area which sits adjacent to numerous historic alluvial gold operations and coincides with several areas of anomalous soil geochemical results."

Gold recovery testwork results summary

The metallurgical testwork program was conducted under the overall supervision of G Mining Services Inc. (GMS). Eighteen composite samples totalling 1,200 kilograms were evaluated using core material from across the deposit representing two gold grades (one gram per tonne Au and two g/t Au), three weathering profiles (saprolite, transitional material and fresh rock) and three geological units (volcanics, metasediments and carbonaceous sediments).

Comminution test results

Comminution testing was completed on all composites except for the carbonaceous sediments to characterize sample hardness. Steve Morell Comminution (SMC), Bond Rod Mill Work Index (RWI), Ball Mill Work Index (BWI) and Bond Abrasion Index (Ai) tests were completed and summarized as follows:

• SMC Axb average value of 33.8 for fresh rock indicates samples are competent;
• Average RWI values of 16.7 kWh (kilowatt-hour)/tonne (fresh rock) and 6.5 kWh/tonne (transitional material);
• Average BWI values of 14.1 kWh/ tonne (fresh rock) and 6.9 kWh/tonne (transitional material);
• Average Ai value of 0.132 (fresh rock) and 0.026 (transitional material).

These results indicate a deposit with a medium level of hardness, which is typical of other deposits in the Guiana Shield region.

Gravity gold recovery test results

Saprolite and fresh rock composite samples were tested using the extended gravity recoverable gold (EGRG) protocols to determine their amenability to gravity concentration. The results showed:

• Moderate to high gravity recoverable gold content ranging 30 to 63 per cent gold;
• At full scale, gravity circuit recoveries would be expected to be in the 10 per cent to 40 per cent gold recovery range.

Grind recovery leach tests

Grind series leach tests were completed on both whole of ore and gravity tails composite samples to evaluate the effect of primary grind size on gold extraction. Samples with a primary size of P80 at 75microm resulted in the best gold extractions on average when compared against P80 of 105microm and 88microm with results described herein.

Standard bottle rolls leach tests

Standard bottle roll leach and carbon-in-leach (CIL) tests were completed on both whole of ore and gravity tails composite samples over 48 hours. In general, P80 of 75microm, gravity leach, oxygen sparging tests produced the best gold extraction results with key observations noted below:

• Gold extraction for gravity-leach averaged 94.4 per cent (fresh rock), 96.5 per cent (transitional material) and 97.5 per cent (saprolite);
• Gold extraction was similar for the one gram per tonne and two g/t material;
• Preg-robbing tests were completed on carbonaceous sediment samples and the results showed little to no preg-robbing.

Based on these results, the recoveries assumed for the PEA will be 92.5 per cent (fresh rock), 95 per cent (transitional material) and 96 per cent (saprolite) since some gold loss is expected from the laboratory tests to the process plant.

The recently released MRE was based on recoveries of 90 per cent (fresh rock), 90 per cent (transition material) and 95 per cent (saprolite) determined from preliminary leach tests prior to the full metallurgical testwork program.

Further PEA testwork

To further support the PEA, the company intends to complete the following additional testwork:

• Mineralogy assessment of core and leach tailings samples;
• Cyanide destruction tests on leach tailings from the bottle roll tests;
• Acid-base-accounting tests on core samples, leach tailings and waste rock samples;
• Aggregate testing of waste rock samples.

Qualified persons

Neil Lincoln, PEng, consultant for GMS and an independent qualified person under Canadian National Instrument 43-101 has reviewed and approved the scientific and technical information concerning metallurgy contained in this news release. Mr. Lincoln supervised the metallurgical tests described in this news release and has reviewed and interpreted the test results.

Justin van der Toorn, CGeol FGS, EurGeol, the company's vice-president of exploration and a qualified person under NI 43-101, has also reviewed and approved the scientific and technical information contained in this news release.

We seek Safe Harbor.