The project’s overview
Oko Gold Project is currently in construction, with a 362 km² land package located in Cuyuni-Mazaruni, Guyana, approximately 95 km west of Georgetown.
G Mining Ventures is building Guyana’s next leading gold mine, with a projected 14 year mine life and over 7 million ounces of reserves. Commercial production is expected to begin in January 2028 for Phase 1 of the project with pre-production on the expanded project in 2028 and targeting expanded throughput in 2029. Exact timing to be confirmed in an updated feasibility study for mid-2027 for the combined project of Oko West and Oko-Ghanie. Once completed, the mining method will include both open pit and underground operations.
About the project
Location
The Oko Gold Project straddles the Cuyuni-Mazaruni Mining Districts (administrative Region 7) in north central Guyana, South America. The Project is located approximately 95 km southwest of Georgetown, the capital city of Guyana and approximately 70 km from Bartica, the capital city of Region 7.
Geology & Mineralization
The Oko gold deposit is located in the north-central Guyana Shield, along a north–south striking contact between the Barama-Mazaruni Supergroup greenstone belt to the west and the Oko pluton to the east.
Gold mineralization at Oko is characteristic of orogenic gold systems and occurs primarily within volcanoclastic, siliciclastic, and carbonaceous sedimentary rocks forming a tabular body dipping gently to the east.
The mineralized zones exhibit strong silica and carbonate alteration, pervasive sericitization, and disseminations of sulfides (pyrite, chalcopyrite, sphalerite) within altered rocks, bedding planes, fractures, and quartz–carbonate vein envelopes. Much of this alteration is pre-mineral, strengthening the host rocks and facilitating brittle deformation and dilation during the D₂ mineralizing stage.
Gold and sulfide mineralization are associated with networks of sulfide-bearing quartz veins and sulfide-only stringers spatially related to quartz–carbonate vein systems that partially to fully overprint the host lithologies. In carbonaceous sediments, these veins are dark grey to smoky, whereas in volcanoclastic and siliciclastic units, they are white to light grey. The darker color in the carbonaceous units likely reflects a geochemical interaction between carbonaceous material and hydrothermal fluids, which acted as a reducing agent enhancing gold deposition and resulting in locally high-grade gold zones.
History
In 2002, the Guyana Geology and Mines Commission (GGMC) conducted the Lower Puruni Regional Geochemistry Programme, which covered the Oko West Gold Project area, identifying gold and molybdenum anomalies from stream sediment samples.
In 2018, the local permit holder introduced Reunion Gold Inc. to several claims that resulted in a site visit to a mining pit to inspect outcrops and alluvial waste piles. Grab samples were collected on this initial visit and included samples BS-02, BS-03 and BS-04, which assayed 2.40, 6.00 and 45.84 g/t gold, respectively. This visit and the interpretation of a favourable local geological context prompted the option of two groups of medium-scale mining permits, one of which was the Oko West Gold Project. On September 23, 2022, a prospecting license was issued to Reunion Gold on the Oko West Gold Project. In April 2024, G Mining Ventures and Reunion Gold announced plans to enter into a definitive agreement to combine the two companies which was completed on July 15, 2024, through approval from GMIN and Reunion gold securityholders.
On December 15, 2024, G Mining Ventures announced that the Corporation had filed a National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI 43-101”) Preliminary Economic Assessment (“PEA”) technical report for GMIN's 100% owned Oko West Gold Project in Guyana, with an effective date of September 4, 2024.The Interim Environmental Permit (IEP) was received in early 2025. Early works construction commenced in the first quarter of 2025 focusing on key site infrastructure. In September 2025, GMIN received its Final Environmental Permit (EP) from Guyana’s Environmental Protection Agency (EPA) and its formal Mining License was granted by the Guyana Geology and Mines Commission (GGMC) in December of that year.
In April 2026, G Mining Ventures entered a definitive agreement to acquire all of the issued and outstanding shares of G2 Goldfields Inc. (G2) to consolidate the two adjacent gold projects – G2’s Oko-Ghanie Project and GMIN’s fully permitted and fully financed Oko West Project.
On July 29, the acquisition was finalized, creating a large-scale, low-cost gold mining hub in one of the most prospective emerging gold districts in the world. The transaction brings together two deposits that are essentially part of the same continuous mineralized system positioned 3km of each other. Both deposits will be merged into a single operation, transforming Oko from single mine build to multi-deposit camp with average life-of-mine annual production of 500k Au oz without adding complexity doing so at very strong capital efficiencies.
The combined project is expected to deliver significant near and long-term synergies across throughput, operating costs, capital costs due to shared infrastructure, mine sequencing and permitting. The acquisition expanded GMIN’s leading footprint in Guyana by 293 km², creating a combined contiguous land package of over 362 km², situated on a highly prospective greenstone belt and largely within a 20 km radius of the Oko West Project.
VRIFY Presentation
Click through the VRIFY presentation below to explore the Oko site.
Oko Gold Project Development Update Presentation
Scroll through the PDF below to explore the latest construction updates at our Oko Gold Project.
