Omai Gold Mines files NI 43-101 report for Omai

Ms. Elaine Ellingham reports OMAI GOLD FILES NI 43-101 TECHNICAL REPORT SUPPORTING AN UPDATED MINERAL RESOURCE ESTIMATE ON ITS OMAI GOLD PROPERTY IN GUYANA Omai Gold Mines Corp. has filed a National Instrument 43-101 technical report dated Oct. 9, 2025, has been filed on SEDAR+ in support of the updated mineral resource estimate (MRE) announced Aug. 25, 2025, on its 100-per-cent-owned Omai gold property in Guyana. The MRE includes an expansion to the Wenot deposit and incorporates the previously disclosed Gilt Creek deposit. Most significantly, for the Wenot MRE, the inferred MRE increased 130 per cent to 3,717,000 ounces grading 1.82 grams per tonne gold, contained in 63.4 million tonnes, and the indicated MRE increased 16 per cent to 970,000 ounces grading 1.46 g/t Au, contained in 20.7 million tonnes. The report was prepared under the supervision of Eugene Puritch, PEng, FEC, CET, of P&E Mining Consultants Inc., which is independent of the company and a qualified person in accordance with NI 43-101. The Omai property hosts two orogenic gold deposits: the shear-hosted Wenot deposit and the adjacent intrusive-hosted Gilt Creek deposit. On Aug. 25, 2025, the company issued a news release announcing the update combined MRE (over the February, 2024, MRE) with the following highlights: 2,121,000 ounces of gold (indicated MRE), a 7-per-cent increase, averaging 2.07 g/t Au in 31.9 million tonnes; 4,382,000 ounces of gold (inferred MRE), a 92-per-cent increase, averaging 1.95 g/t Au in 69.6 million tonnes. Wenot deposit (a constrained pit and underground approach is applied): 970,000 ounces of gold in 20.7 million tonnes (indicated), a 16-per-cent increase in ounces over the February, 2024, MRE; 3,717,000 ounces of gold in 63.4 million tonnes (inferred), a 130-per-cent increase in ounces; 1.46 g/t Au grade of indicated MRE, a 1.4-per-cent decrease; 1.82 g/t Au grade of Inferred MRE, an 8.5% decrease Note: increased gold price assumption to $2,500 per ounce from $1,850 per ounce allowed cut-off lower to 0.30 g/t Au from 0.35 g/t Au, resulting in lower average grades however increased ounces; Approximately 60 per cent above 350-metre depth from surface; Approximately 30 per cent of Wenot MRE is west of the historical open pit, an area considered to be well suited to initial mining; Expansion potential is evident along a minimum 2.5-kilometre length of the host Wenot shear corridor, including within, adjacent to, below and along strike. Gilt Creek deposit (an underground mining approach is applied): 1,151,000 ounces of gold (indicated) averaging 3.22 g/t Au in 11.1 million tonnes (February, 2024, MRE); 665,000 ounces of gold (inferred) averaging 3.35 g/t Au in 6.2 million tonnes (February, 2024, MRE); Hosted within a 500-metre-by-300-metre quartz diorite intrusive Omai stock that produced 2.4 million ounces of gold (1993 to 2005) from the upper 250 metres; Located 500 metres north of the Wenot deposit and below the past-producing Fennel open pit; Characterized by very wide subhorizontal zones of gold mineralization; Open to depth and holds demonstrated potential for lateral expansion. Full details are presented in the report filed on SEDAR+ and the company's website. Qualified persons Elaine Ellingham, MSc, PGeo, and Eugene Puritch, PEng, FEC, CET, president of P&E Mining Consultants, both qualified persons under NI 43-101, Standards of Disclosure for Mineral Projects, have approved the technical information contained in this news release. Ms. Ellingham is not considered to be independent for the purposes of NI 43-101. The mineral resource estimate, including verification of the data, was under the supervision of Mr. Puritch, who is independent for the purposes of NI 43-101. About Omai Gold Mines Corp. Omai Gold Mines is a Canadian gold exploration and development company focused on rapidly expanding the two orogenic gold deposits at its 100-per-cent-owned Omai gold project in mining-friendly Guyana, South America. The company has established the Omai gold project as one of the fastest-growing and well-endowed gold camps in the prolific Guiana Shield greenstone belt. In February, 2024, the company announced a preliminary economic assessment (PEA), reported in an NI 43-101 report filed in April, 2024, available on SEDAR+. The 2024 PEA contemplated an open-pit-only development scenario and included only 45 per cent of the Omai gold project MRE. More recently, the company announced an updated, significantly increased mineral resource estimate on Aug. 25, 2025, and is commencing the preparation of an updated PEA that is expected in early 2026. Four drills are currently active on the property: At Wenot, the focus is to optimize the coming PEA, to further test the limits of the deposit, including both east and west, and to upgrade some of the large inferred resource to indicated. Additional drilling will explore certain known gold occurrences for possible near-surface, higher-grade satellite deposits. The Omai gold mine produced over 3.7 million ounces of gold from 1993 to 2005, ceasing operations when gold was below $400 (U.S.) per ounce. The Omai site significantly benefits from existing infrastructure and will soon be connected to the two largest cities in Guyana, Georgetown and Linden, by paved road. We seek Safe Harbor.