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OKO WEST PROJECT

GUYANA

OKO WEST PROJECT 

Background

Reunion Gold's Oko West Project is in northwest Guyana and located south of the historical "Oko" gold district. Oko West represents a brand-new gold discovery located in an area with few artisanal mine workings. In 2020, Reunion Gold's geochemical survey, trenching, and initial drill program discovered and confirmed the presence of gold mineralization in shear zones along the contact between a greenstone belt assemblage and a granitoid unit on the east side of the project area. The mineralization coincides with a 6 km long gold-in-soil geochemical anomaly. The northern 2.5 km of strike length of that geochemical anomaly, where most of the drilling to date has taken place, is being referred to as the Kairuni zone. The southern 3.5 km of that geochemical anomaly (now being called the Takutu zone) remains largely untested and represents one of several priority exploration targets on the project. An ongoing drill program at the Kairuni zone is currently in phase 4 and has confirmed the presence of gold in both the saprolite and unweathered rock. The Kairuni zone shows good continuity of gold mineralization along its 2.5 km of strike. The deepest hole drilled to date on the zone is about 220 m (vertical depth), and it intersected strong gold mineralization. The Kairuni zone remains open along strike and to depth. 

Location

 

The Oko West Project is in the Cuyuni Mining District, some 95 km west of Georgetown and accessible by the Puruni laterite road and trails from the town of Itabali on the Mazaruni river (Figure 1).

Mineral rights and agreement

The Oko West Project comprises 10,880 acres of mineral rights held by local Guyanese entrepreneurs. Reunion entered into agreements entitling it to conduct exploration activities and acquire a 100% interest in the Project area. 

Geology and mineralization

 

The Oko West Project area is underlain by a greenstone belt assemblage of Proterozoic rocks from the Barama Group, consisting of volcanics and clastic sediments.  These greenstone units have been intruded by granitic plutons and have been strongly deformed by at least two tectonic events (Figure 2).  Gold mineralization at Oko West was initially discovered at the eastern edge of the project area.  The interaction of the two contrasting rock units to the tectonic events appears to have contributed to intense shearing that is evident and likely created dilatant zones favorable for the emplacement of gold mineralization.  The gold mineralization is closely associated with carbonate and sericite alteration, is typically found within small quartz veins and quartz stockworks and is usually accompanied by pyrite. 

Exploration work

In 2019, Reunion Gold completed geological mapping, stream sediment geochemistry, and a detailed airborne magnetic and radiometric survey. 
 
Geochemistry


In 2020, a soil sampling survey was undertaken with samples taken every 50 m along lines spaced 200 m apart. The survey defined a gold in soil anomaly with a strike length of approximately 6 km. The anomalies are coincident with a shear zone associated with the geological contact between a volcano-sedimentary rock unit and granitoid rocks.(Figure 3)

Trenching

The Company followed up the geochemical survey with a trenching program designed to test and confirm the geochemical anomaly. The trenching program consisted of excavator dug trenches with channel samples collected on the trench walls. A series of trenches were excavated at approximately 200 m intervals over the northernmost 2.5 km of the gold in soil geochemical anomaly (the Kairuni zone) and totalled over 7,500 meters. Assay results from the 33 trenches are reported in Figure 4 and table 1. The trenching program successfully confirmed the gold mineralization in the Kairuni zone that was initially indicated by the soil geochemical anomaly.

Drilling

On February 18, 2021, the Company reported assay results from the completion of its initial 1,000-meter diamond drilling program. This program successfully tested the vertical continuity of gold mineralization in the Kairuni zone into the saprolite below trenches 4, 9, 18 and 19.

The encouraging results from this initial drill program prompted Reunion Gold to launch phase 2 and 3 drill programs totalling approximately 16,500 meters in order to systematically test the vertical and lateral continuity of the 2.5 km long Kairuni zone that was previously identified through trenching and soil geochemistry. For ease of reference, Reunion Gold also identified six exploration "blocks" within the Kairuni zone. The phase 2 and 3 drill programs were designed with east-west drill "fences" spaced at every 100 meters to facilitate future resource estimates. The program began on June 17, 2021, with one diamond drill rig, and, on July 25, the Company added a reverse circulation drill rig to complement the coverage of the known mineralized footprint and to allow for exploration of new mineralized zones. In October 2021, the Company added a second diamond drilling rig. As of February 2022, the Company had completed 64 diamond drill holes totalling 8,911 meters and 104 reverse circulation drill holes totalling 8,576 meters, mostly in the Kairuni zone. 

 

On May 5, 2022, the Company announced an increased drill budget, including an additional 7000 m of diamond drilling and an additional 9,000 m of RC drilling which is targeted for completion in August 2022 and is expected to be included in the maiden resource estimate. This program is designed to test the lateral and vertical continuity in the Kairuni zone to a depth of approximately 250 m over the 2,500 m Kairuni zone, in preparation for a maiden resource estimate targeted for Q3/22. The program will include step-out holes to test the depth extension of the Kairuni zone, several metallurgical holes and scout holes to test three additional priority target areas on the Oko West project shown in figure 5. These targets include the Takutu zone, which represents the southern 3.5 km of the gold in soil geochemical anomaly and lies upstream from an area of significant alluvial workings (figure 5). Mapping and sampling of the Takutu zone is currently underway. The second target area is immediately west of the Kairuni zone and incorporates an area containing several gold in soil anomalies and appears to be underlain by favourable geology. One fence of scout holes (no assays received) has been completed across this zone while a second has been planned. The third target area represents the potential hard rock source for alluvial gold mineralization that has been mined downstream of the project area. Reconnaissance of this zone is expected to occur in 2H/22.

The drilling completed since June 2021 has shown excellent results, indicating continuous gold mineralization over the 2.5 km long Kairuni zone down to a vertical depth of ~349 m in hole OKWD22-062 which intersected 1.5 g/t over 67.3 m, 3.62 g/t over 8.5 m and 1.13 g/t over 7.0 m. A second hole drilled to test depth potential intersected 2.45 g/t over 64.7 m, 1.54 g/t over 35.0 m and 5.10 g/t over 6.0 m to a depth of 302 m vertical depth. The continuity and depth extension of the Kairuni zone are illustrated in the plan map and longitudinal sections shown in figure 6 (which are based on a g/t block model with a 0.3 g/t cutoff). Figure 7 is a map showing the latest interpretation of the geology of the project as well as the highlight intercepts from the May 5, 2022 press release. Figures 8 – 11 show cross-sections of the mineralization in the Kairuni zone highlighted in the most recent press release. Tables 1-3 show detailed trench, diamond drilling, and reverse circulation drilling results can be found in the links below labelled table 1: Trenching results, table 2: Diamond drilling composite results, and table 3: Reverse Circulation drill composite results.

 

Link to: Table 1: Trenching results

Link to: Table 2: Diamond drilling composite results

Link to: Table 3: Reverse Circulation drill composite results

  

Notes to the tables of composite results

 

The Company calculates drill results composites with a minimum length of 2 m, a cut-off grade of 0.3 g/t, and up to 7 m maximum length of internal waste. Gold grades are uncapped. Mineralized intersection lengths are not necessarily true widths. Diamond drill samples consist of half of either HQ or NQ core taken continuously at regular intervals averaging 1.4 m, bagged, and labelled at the site core shed. Reverse circulation drill samples are obtained from a rotary splitter attached to a Metzke cyclone, weighed, bagged, and tagged at the drill site. Samples are shipped to the Actlabs certified laboratory in Georgetown, Guyana, respecting the best chain of custody practices. At the laboratory, samples are dried, crushed up to 80% passing 2 mm, riffle split (250 g), and pulverized to 95% passing 105 μm, including cleaner sand. 50 g of pulverized material is fire assayed by atomic absorption (AA). Initial assays with results above 3,000 ppb gold are re-assayed with a gravimetric finish. Certified reference materials and blanks are inserted at 5% of samples shipped to the laboratory. Field duplicates and umpire pulp duplicates are also generated at 5% of samples. Pulp umpire duplicates are analyzed at MSALabs certified laboratory in Georgetown. Assay data is subject to QA/QC using acQuire software and management by an independent consultant.

 

Sampling and analysis:

  • Trench samples are channels taken horizontally and continuously in in-situ weathered rocks (saprolite) at regular intervals on trench walls. Reunion considers channel samples as sub-horizontal "drill holes" given their continuity and representative rock mass.

  • Diamond drill samples consist of half of either HQ or NQ core taken continuously at regular intervals averaging 1.4 m, bagged, and labelled at the site core shed.

  • Reverse circulation drill samples are obtained from a rotary splitter attached to a Metzke cyclone, weighed, bagged, and tagged at the drill site.

  • Samples are shipped to the Actlabs certified laboratory in Georgetown, Guyana, respecting the best chain of custody practices. At the laboratory, samples are dried, crushed up to 80% passing 2 mm, riffle split (250 g), and pulverized to 95% passing 105 μm, including cleaner sand. 50 g of pulverized material is fire assayed by atomic absorption (AA). Initial assays with results above 3,000 ppb gold are re-assayed with a gravimetric finish. Certified reference materials and blanks are inserted at 5% of samples shipped to the laboratory.

  • Assay data is subject to QA/QC using acQuire software and management by an independent consultant.

 

Other parameters:

  • Drill and trench collar locations were surveyed by professional Guyana land surveyors using differential GPS and total stations.

  • Diamond drill holes are surveyed by down-hole equipment.

  • Diamond drill core is oriented as frequently as possible.


 

Figure 1: Oko West project location showing roads and regional geology

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Figure 2: Oko West project outline and geology

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Figure 3: 6 km gold in soil geochemical anomaly

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Kairuni
zone

Takutu zone

Figure 4: Results from trenching program on the Kairuni zone

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Figure 5: Three additional priority exploration targets at the Oko West project

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Figure 6: Block model plan and longitudinal maps for the Kairuni zone at Oko West

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Figure 7: Plan map for the Kairuni zone at Oko West showing geology, drill hole locations and highlight holes from the May 4th, 2022 press release

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Figure 8: Cross section looking north on line 1650 N

 
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Figure 9: Cross section looking north on line 1600 N

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Figure 10: Cross section looking north 1850 N

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Figure 11: Cross section looking north 1540 N

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