Bibemi is an early-stage gold exploration project, covering highly prospective Neoproterozoic Pan-African greenstone belts in north-eastern Cameroon. The Company’s interest in the project is held through its 51%-owned subsidiary RMC Cameroon SARL.
Bibemi (177 km2) is the Company’s most advanced project in Cameroon. In Q3-2018, the Company undertook a rock-chip sampling programme on the central Bakassi area, where former operator Reservoir Minerals Inc. had identified multiple mineralised trends over a strike distance of c.20km. A total of 454 rock chips samples were taken from quartz and quartz-tourmaline veins, and the host wall rock. Best results include 135.4 g/t Au, 119.7 g/t Au, 117.2 g/t Au and 107.2 g/t Au, with 16 samples returning >10 g/t Au and 43 samples assaying >1 g/t Au. The results extended the previously defined NE-trending ‘Zone 1’ gold anomaly to more than 4km in strike, and a second parallel NE-trending anomaly ‘Zone 2’ returned up to 35.9 g/t Au.
During 2019, the Company completed over 12,500m trenching. Results, up to 9m @ 3.14 g/t Au, have confirmed multiple zones of orogenic-type gold mineralisation, associated with quartz and quartz-tourmaline veins hosted in mafic schist and granodiorite. Channel samples taken across individual quartz veins within the trenches have also confirmed the potential for higher-grade mineralisation with best results of 13.70 g/t Au over 25cm and 9.55 g/t Au over 10cm from trench BT-010 and 6.64 g/t Au over 30cm in trench BT-019. Selective re-testing of historic RMC trenches (T01, T04, T07 and T08), to assess the continuity of mineralisation between Oriole’s trenches immediately to the north and south, has returned 2m at 9.9 g/t Au from T07 and 2.25m @ 1.13 g/t Au, 3m at 0.49 g/t Au and 2m at 2.46 g/t Au from T08.
Structurally-speaking, the entire Bakassi area appears to be a succession of folds with north-northeast axes. Mapping of the north-eastern end of the Bakassi area has confirmed the extension of mineralisation within the Zone 1 structural corridor by 1.3 km to the north-east, to approximately 5.3 km. Multiple sets of sub-horizontal, stacked quartz veins have also been identified that could support enhanced volumes of gold mineralisation in this area. Selective samples of ‘Category 1’ quartz-tourmaline veins, the most prospective for gold mineralisation, were taken to support the mapping. All samples were mineralised (>0.10 g/t Au) and 7 out of the 10 samples graded greater than 2.00 g/t Au, with best results of 35.86 g/t Au, 23.30 g/t Au and 19.70 g/t Au.
A maiden drilling programme is currently underway at the project for a planned 3,080m in 28 holes. Drill targets for an initial 2,300 metres of drilling (over 20 holes) have been planned at Bakassi Zone 1 and Bakassi Zone 2 to test the depth-extension of the mineralisation. In particular the drilling will target three zones of mineralised, stacked veins where grades of up to 65.30 g/t Au and intersections of up to 9m @3.14 g/t Au have been returned from rock-chip and trench sampling, respectively.
As a 19 March 2021, a total of nine holes had been completed for 967.50m at Bakassi Zone 1. All holes have intersected mineralisation, with visual confirmation in the form of quartz-tourmaline veining and/or pervasive alteration and sulphidation (predominantly pyrite with minor chalcopyrite and arsenopyrite) of the tonalite host rock. The most robust zones of mineralisation to date have been observed on fence line 1, centred on the historic RMC trench T08, which comprises holes BBDD004, BBDD005 and BBDD007. In addition to the targeted northeast-trending (steeply southeast-dipping) veins, the team has identified flatter-lying, stacked veins (replicating what was observed in the trenches) that have intersected parallel to the drillhole. This is particular evident in hole BBDD005, where a quartz-tourmaline is intersected by a vein of massive sulphide. As a result, hole BBDD007 was drilled at a steeper angle of -60 degrees to investigate this intersecting vein set and has intersected a wider zone of mineralisation (12m downhole compared to 3m to 9m) than observed in previous holes. These structural observations are being taken on board as the programme continues.
Recent reconnaisance mapping to the south-west extended the system to 8.3km with the identification of two new prospects, Lawa West and Lawa East, which related to the intersection of the dominant north-northeast shears in Bakassi 1 and Bakassi 2 with a north-east structure. Rock-chip sampling at Lawa West and Lawa East has returned results of up to 11.68 g/t Au and 22.38 g/t Au, respectively, with 6 out of 49 samples grading over 1 g/t Au. The structural intersection supports the magnetic imagery across the zone, and appears to correlate with the margin of a granitic body.
At Lawa West, closely-spaced quartz veins up to 1.30m wide have developed, and these are commonly sheared and/or brecciated with fractures filled with sulphides, signifying multiple phases of deformation and fluid flow. Importantly, at Lawa East, mineralisation is also observed within the host rock (mafic schist) rather than discrete quartz veins as found elsewhere within the licence, supporting an interpretation of more pervasive fluid flow and gold deposition. The new prospects will be tested by eight drill holes for 800m.
First results from the programme are anticipated at the end of Q1.
BEIG3 Option Agreement
Under the terms of an Option Agreement signed in June 2018, the Company will earn an initial 51% of both Projects by funding US$1.56m of exploration over two years. Thereafter, Oriole can earn a further 39% for an additional U$1.56m exploration expenditure, or on the completion of a pre-feasibility study on at least one of the Projects, over the subsequent two years. BEIG3 will retain a 10% free carried interest in both projects up to completion of the Second Option or the completion of a pre-feasibility study on at least one of the Projects.
Oriole has now met its Year 2 expenditure and work commitment under the Option Agreement. Oriole is a first-mover in Cameroon and is also operaing a district-scale 3,592km2 licence package in Central Cameroon.
Bibemi JORC Table 1