Thani Stratex Djibouti
Oriole has an 11.80% interest in privately-owned Thani Stratex Djibouti Limited (‘TSD’) for its projects in Djibouti.
TSD is currently focused on the Oklila (Pandora), Hesdaba and Assaleyta licences. In November 2018, TSD signed an agreement with African Minerals Exploration & Development Fund III for the management and funding of TSD. The first US$2.5 million tranche of the funding has been used to undertake drilling programmes at Pandora and Hesdaba. Further tranches will be advanced subject to TSD achieving performance milestones, including resource definition and the completion of technical studies.
The 93 sq km Oklila licence includes the main Pandora epithermal vein target (comprising Pandora and Pandora South prospects) which is up to 15 metres wide at surface and can be traced over a strike length of approximately 2 km. Grades vary from 5ppb Au to 54.5g/t Au.
Located 250 metres SW of the main Pandora structure, the Pyrrha Vein has been identified over a strike length of 1.5 km. The vein is generally less than 1 m in thickness. High gold assays of up to 71.60 g/t Au at surface could indicate a potential for the presence of high gold grades at depth. Further mapping in the area has also discovered the Thyia Zone which appears to be a linkage structure between Pyrrha and Pandora. The entire system at Oklila comprises over 10 km strike of outcropping and inferred veins.
A maiden diamond drilling programme was completed in 2016 for 2,159 m in 15 holes across the Pandora South and Pandora Central zones. The best results were yielded from paired holes OK-D-10 and OK-D-11, and OK-D-12 and OK-D-13 that were drilled 200 m apart and included 1.36 m @ 10.55 g/t Au and 6.87 m @ 4.45 g/t Au. These holes have confirmed continuity of surface mineralisation to a vertical depth of approximately 150 m below surface, with the intersections in holes OK-D- 10 and OK-D-11, and OK-D-12 and OK-D-13 correlating with surface values of 1.30 m @ 6.40 g/t Au and 1.90 m @ 20 g/t Au respectively.
In H1-2018, TSD completed Phase 2 drilling for 3,036.5 m in 18 holes. The aim of this drilling was to test the depth-extension of previously drilled mineralisation and identify potential higher-grade ore shoots within the system that could lead to the definition of a resource. Results demonstrated broad zones of multi-gram gold mineralisation towards the NW-end of the main Pandora vein, as well as narrower zones of higher-grade mineralisation. Best results (recalculated by the Company using a 0.2 g/t Au cut-off) include:
- 20.17 m @ 1.16 g/t Au (from 4.23 m in hole OK-DD-17);
- 11.83 m @ 0.82 g/t Au (from 67.17 m in hole OK-DD-19);
- 16.80 m @ 1.47 g/t Au (from 94.30 m in hole OK-DD-20)
- 8.30m @ 7.21 g/t Au from 144.55m, including 0.80m @ 26.10 g/t Au (Ok-D-25);
- 10.00m @ 1.20 g/t Au from 130.00m including 5.85m @ 1.90 g/t Au (Ok-D-29);
- 35.07m @ 1.28 g/t Au from 109.55m including 9.80m @ 3.06 g/t Au and 2.40m @ 1.75 g/t Au (Ok-D-31);
- 1.10m @ 5.10 g/t Au from 42.00m including 0.50 m @ 9.91 g/t Au, and 1.22m @ 55.40 g/t Au from 50.38m (Ok-D-32); and
- 3.54m @ 2.35 g/t Au from 100.46m (Ok-D-33).
Importantly, hole OK-D-32 was drilled to intersect the WNW-oriented Pyrrha vein, which appears to be part of the same structurally-controlled vein system as the Pandora vein, and returned 55.4 g/t Au over 1.22m from approximately 32m below surface (based on -50° drill hole inclination). Review of the satellite imagery suggests a series of structural offsets (a sign of strain accommodation) in the zone between the main Pandora and Pyrrha structures, that are likely to have created enhanced zones of dilation and gold deposition.
More recently, a Phase 3 drilling programme was completed for 1,242 m in Q1-2020. Results from the 13-hole programme support those yielded from the previous drilling phases, with the best intersections yielded at the north-western end of main Pandora prospect and at the south-eastern end of Pyrrha prospect. Best results (recalculated by the Company using a 0.3 g/t Au cut-off) include:
- 16.86 m grading 1.42 g/t Au from 13.00 m, including 6.63 m at 2.68 g/t Au (Ok-D-46)
- 1.50 m grading 1.05 g/t Au from 43.25 m (Ok-D-35)
- 6.80 m grading 2.19 g/t Au from 23.58 m (Ok-D-36)
- 5.00 m grading 1.10 g/t Au from 107.00 m (Ok-D-44)
Mineralisation is predominantly related to quartz vein and hydrothermal silica breccia, with associated demagnetisation of the basalt host rocks. Highest grades are related to the presence of sulphide-rich chalcedonic silica, as shown in the following two cross-sections (modified after TSD to show intersections at 0.3 g/t Au cut-off).
TSD has advised that it will complete a full review of data from its projects in Djibouti ahead of planning any follow-up programmes.
At the recently-acquired Hesdaba project, 10 km northwest of Pandora, TSD has completed detailed mapping that has identified veins over a combined strike of 16 km. A Phase 1 drilling programme comprising 1,931 m of diamond drilling (14 holes) and 1,529 m of RC drilling (15 holes) has also been completed to test the epithermal system at depth across three primary targets: Maranzana, Caravan and Red Horns. Results are anticipated in Q3-2020.
Located c.16 km to the North of Pandora, low-sulphidation epithermal gold occurs as high-grade veins and disseminated mineralisation in rhyolite domes. Phase 1 exploration by Thani Stratex during Q2-2015 comprised 303 samples (126 grab and 177 chip samples across 13 channels) and 1:2,000 mapping across the sample areas. Channel sampling returned best values of 19 m @ 4 g/t Au and 6 m @ 10 g/t Au (600 m apart), and five selective grab samples assayed >20 g/t Au (highest grade of 41 g/t Au).
In 2016, a maiden drilling programme was completed across the three main prospects, Porcupine Hill, Red Eagle Mountain and Black Mamba. The drilling confirmed vertical continuity of the system to a depth of at least 175 m and returned best intercepts of 17.38 m @ 2.25 g/t Au from surface (AY-DD-01) and 1.58 m @ 8.67 g/t Au from 177.19 m (AY-DD-03).
Camp construction, major road and drill access works, and 2,000 m Phase 2 diamond drilling programme were originally planned for H2-2020. However, as a result of COVID-19, further work at this project is on hold until further notice.