Waiamu has a recent history of extensive small-scale mining and hosts numerous gold targets defined by geophysical and geochemical surveys, with limited drill testing to date. The main structural corridors hosting mineralization extend for a strike length of over 15 km within the project boundaries.
The Waiamu Project is located in the Cuyuni River Mining District in northwest Guyana, approximately 135 km from the capital Georgetown (Figure G1). Access is by helicopter, laterite road and boat via the Cuyuni River.
Mineral rights and agreement
In May 2018, Reunion entered into an agreement with local entrepreneurs in respect to the Waiamu Project, entitling Reunion to conduct exploration activities and to acquire a 100% interest in the Project area during an initial period of five years, with possible extension of up to two additional years. The Project consists of six Prospecting Licenses covering an area of approximately 51,000 acres.
Geology and mineralization
The Waiamu project is underlain by a NE-trending clastic sedimentary sequence, which includes interspersed mafic volcanics and pyroclastic units typical of the Guiana Shield greenstone belts of Proterozoic age. The sedimentary sequence has been deformed and metamorphosed. This sequence hosts numerous artisanal gold workings, with gold-bearing quartz veins often forming dense “swarms” with significant volumes. The current owners are carrying out artisanal gold mining in the weathered cap of two prospects using contractors.
Mining and exploration history
There was intensive artisanal alluvial and primary gold mining in the area by local entrepreneurs. Virtually all the local creeks show evidence of systematic work using primitive mining methods – sluice boxes, etc. Two prospects, Ceguinho and St. John, were mined using mechanical excavation and more sophisticated processing equipment, including hammer crushers and centrifuges. The only artisanal activities still ongoing are small groups of pork-nockers using metal detectors for gold nuggets and small sluices to process historical tailings.
A comprehensive exploration program of regolith geochemical sampling, geological mapping, trenching and drilling covering the 150 km² eastern half of the Waiamu project area was initiated in the first quarter of 2018 (Figure W1). The work done so far has identified a NE-trending sequence of mostly clastic sediments intercalated with mafic volcanic flows and a distinct doleritic sill, in which gold mineralization aligns closely with two sets of shear zones.
Geochemical sampling identified numerous zones of anomalous gold within the central volcanic-dominated domain on the project area and a subsequent detailed heliborne magnetic and radiometric surveys showed that these anomalous zones coincided with several structures (shears) which were then targeted for follow-up. This follow-up work included over 7,800 m of trench sampling over eight of the targets (Figure W1) and 4,050 meters of diamond drilling on two artisanal mining prospects, Ceguinho and St. John, as well as the W14 target area (Figure W1).
After having prioritized targets based on a comprehensive review of their associated geological, geochemical and geophysical anomalies, Reunion has completed an 80 line-km gradient array induced polarization geophysical survey over six of those targets. Reunion is currently evaluating plans to conduct further exploration work on Waiamu subject to available funds.