Summary:
The Oko property geology is based on field data collected by the G2 Goldfields exploration team, and on three internal unpublished reports compiled by Dr. Brett Davis summarizing the geology and structural features of the Main Oko, Ghanie and Northwest Oko deposits.
1. Backfill
This is usually a thin layer of material that may be present due to earth movement required for drill pad preparation. It is usually up to 4 m in thickness and comprises of a weakly consolidated mix of whatever material is close by at surface, typically saprolite.
2. Saprolite
This domain represents weathered bedrock that is now in the form of oxide and clay minerals that can be amenable to free digging. It is typically between 15 m to 75 m thick, and the thickness can be dependent on the host rock composition and other factors. The upper portion of the saprolite domain is sometimes a texture-less mass of clay and oxide minerals, which can be sub-classified as the upper saprolite. Below this, some in-situ rock textures and geological structures may be preserved and mappable in the lower saprolite domain. Although there is sometimes a transition zone where there is a mix of the underlying bedrock and free-dig oxide material, in many instances this domain is less than 5 m thick. Due to this reason, it was not included in a separate regolith domain and was instead included as part of the saprolite domain.
3. Fresh Rock
The fresh rock domains consist mainly of the volcano-sedimentary rocks of the lower Barama Group rocks, and the upper Cuyuni basin sediments. This regolith domain represents the unweathered rocks and typically lies between 35 m to 75 m vertical.
Geological Structures
The principal structure that occurs at the property scale is the shear zone which hosts the Oko Main and Ghanie deposits. The shear structure which hosts the economic mineralization for these two deposits is mineralized over a strike length of at least 2.4 km. However, the same structure continues further south beyond the G2 property boundary also hosts G Mining Ventures Corp’s. (G Mining) Oko West gold deposit, thereby giving the shear zone a total metal inventory of over 9 million ounces of gold in all resource categories over approximately a strike length of 5.5 km. This shear zone has a dip angle of between 60 to 65 degrees and a dip direction of between 82 to 95 degrees at the deposit-scale. The kinematics on the shear zone has been documented by Davis et.al. (2023 and 2024) as being east side up - sinistral slip, making this an oblique shear zone that is recorded as the 3rd identifiable deformation event in the drill core of both the Oko Main and Ghanie gold deposits.
Recent diamond drilling a further 3 km north of the Oko Main deposit has confirmed that the structure continues further north (North Oko Zone) with the similar kinematics, strain intensity and affecting similar host rocks to the OMZ and Ghanie deposits. Although economic grades of mineralization are yet to be intersected by drilling, this confirms that the targeted shear structures are within a deformation corridor that continues for tens of kilometres.
Structural Geology and Mineralization
The OMZ gold deposit contains six mineralized shear zones which occur mainly on lithological contacts. It is to be noted that this is simply a function of the host rock contacts being subparallel to the shear zones at the OMZ deposit area, as to the north and south of the deposit these shear zones have been observed to cross-cut multiple lithologies. These shear zones are the principal controlling feature to gold mineralization within the deposit. They are all subparallel to each other, and on average have an orientation of dip direction of 090 degrees, and a dip angle of 65 degrees. These are both variable though, especially to the south of the deposit where the structures and host rocks rotate to a different orientation that averages a dip direction of 045 degrees and dip angle of 60 degrees. These mineralized shears in the OMZ deposit have variable widths. Shear zones 3, 4 and 5 which accounts for most of the high-grade mineralization in laminated quartz reefs generally have a width range of 5 m to 10 m. Most of the quartz reefs within these three shears vary between 1.5 m and 3 m in width.
The Ghanie deposit consists of a principal shear structure on the eastern contact of the Ghanie diorite and any rock type that is in contact with it. This principal structure, the Ghanie main shear zone has an average orientation of dip direction of 081 degrees, and dip angle of 63 degrees. The Ghanie main shear generally varies in width from 10 m to 35 m. Within this structure, there is usually a zone of more intense strain accumulation approaching the footwall contact with the shear zone which is adjacent to the rigid body Ghanie diorite. This intense zone of straining is the host of generally higher-grade mineralization, and has an average width of 5 m, but can dilate to be up to 10 m width in some areas.
The NW Oko deposit is controlled by two main structure sets. A secondary set with an average dip direction of 005 degrees, and dip angle of 62 degrees (S2) and a principal shear set oriented with an average dip direction of 057 degrees and a dip angle of 55 degrees (S3). The mineralization is associated with 0.5 m to 5 m wide quartz reefs in carbonaceous mudstones within these shear zones, and with <0.3 m wide quartz vein arrays and breccia zones in the more competent lithologies adjacent to these mudstones. Broader widths of mineralization up to 50 m in width down hole occur where these two structure sets intersect each other. The mineralized intervals generally vary between 10 m to 50 m.
Gold mineralization in the host shear structure of the New Oko deposit has been defined for a strike length of approximately 720 m and a depth of about 350 m. The mineralization is typically about 30 m thick but can dilate to true widths of 48 m in some areas. Two distinct cleavages have been identified in the shear zone which have a direct association with gold mineralization. An earlier formed foliation, classed as S1 is the more penetrative fabric and has a mean orientation of 70/341 (dip angle/dip direction). This fabric has been observed with dip angles lower than 50 degrees. It is affected by a subsequent shear deformation which is dominantly dip slip kinematics. This shear cleavage was classified locally as S2 and has a mean orientation of 86/349. It was consistently observed with apparent slip of southeast blocks moving upwards relative to northwest blocks. The timing of sulphide emplacement (and thus mineralization) was constrained to be at the early stages of this 2nd deformation event. Pyrite mineralization though present in both cleavage sets is preferentially G2 Goldfields Inc Oko Gold Project 7 January 23, 2026 occupying S1 fabrics, but some crystals are affected by the D2 deformation. The intersection lineation between these two fabrics also parallel the trends of higher-grade continuity within the plane of the shear zone, with the dominant linear trend being approximately 38/058 and the subordinate linear trend being 15/255 (plunge angle/plunge direction). To date, there has not been a reconciliation between the deformation history documented at the New Oko deposit, and those recognized at the OMZ-Ghanie system.
Deposit Type
The geochemical results and the structural interpretations suggest that the in-situ gold mineralization can be categorized as an orogenic gold deposit type (also known as mesothermal gold deposit type).