Robex Kiniero Gold District Sabali South Discovery
QUÉBEC CITY, May 20, 2022 (GLOBE NEWSWIRE) -- Robex Resources Inc. ("Robex", "the Group" or "the Company") (TSXV: RBX) is pleased to announce a
discovery on the property in Guinea following the merger with Sycamore Mining.
Following acquisition of the 326km² Kiniero Gold Project in January 2020 by Sycamore Mining, a Project-wide interpretation of the available data to generate and identify exploration target areas was undertaken. The aim of this target generation campaign was to identify new exploration targets that had not yet previously been drilled.
A strong gold-in-soil geochemical anomaly was identified in the south of the Project, which was supported by a clear anomalous magnetic signature in historical airborne geophysics. On 12 March 2020, Sycamore Mining commenced drilling at the target, with the third drillhole of the campaign (RC20-003) being the discovery hole, returning 11m at 1.05g/t (from 29m) and 20m at 1.01g/t (from 55m).
The discovery was named Sabali South which has a proximal location to the new proposed 3Mtpa plant (~1.5km), easily accessible and topographically gently undulating. Subsequent extensive exploration has confirmed that the Sabali South deposit forms a part of a much larger shear mineralised corridor, termed the Sabali-Mansounia Corridor. The cumulative 6km strike length of the Sabali-Mansounia Corridor has been under-explored, which is currently largely open along strike and at depth. This discovery represents the single largest discovery within the 326km² Kiniero Gold Project since the discovery of the Jean and Gobelé deposit in the 1950s. More importantly, the Sabali-Mansounia Corridor represents one of the largest contiguous zones of mineralisation within the Southern Siguiri Basin. More than 20 years on since the original development of the historic Kiniero Gold Mine, the discovery and evolved understanding of the broader Kiniero Gold District underlines the level of prospectivity, and under-explored targets, within this sector of the Siguiri Basin in Guinea.
Since the commencement of this maiden drilling campaign at Sabali South, the exploration and geological interpretation of the deposit has been continuous, with drilling currently active in parallel with advanced resource modelling at the date of this press release.
Highlighted workstreams over the preceding two years include:
Extensive Drilling and Assaying – all completed by Sycamore Mining. A total of five (5) diamond drillholes for ~1,200m (geotechnical and geology), 259 RC drillholes for ~42,000m
(to a 25m grid spacing along strike) and three (3) trenches for 500m have been completed. Drilling is ongoing at the time of this press release. Laboratory assay work has been completed by SGS
Bamako, SGS Ouagadougou and Intertek Tarkwa – all accredited and reputable laboratories in West Africa.
Site visits by three independent geological and mining consultancies over the preceding two years have verified the work completed and corroborated the findings and
interpretations to date.
Demonstrated Prospectivity: Commencement of a Project-wide BLEG soil sampling campaign on 26 October 2020, which has been completed across Sabali South, and is ongoing through
the Mansounia Licenses currently. BLEG results indicate that mineralisation remains evidently open to the south and east of the Sabali South deposit with some highly anomalous zones (>0.5g/t,
and in some instances >1.5g/t), in a corridor which is well defined, over 700m in width and only partially drill tested. The BLEG results materially bolster the prospectivity of the
mineralised Sabali-Mansounia Corridor, considering the ongoing demonstrated relationship between the BLEG gold-in-soil with the drilling results.
- Multiple high-priority ready-to-drill targets at Sabali South (extending into the Mansounia License) are identified, which will complement the increasing resource-base from Sabali South; and
- Integrating the BLEG results with reprocessed airborne magnetic geophysical data yields a trend of positive magnetic response with the BLEG gold-in-soil
geochemical anomalism, which is accentuated where transected by fractures or fracture intersections.
Project-wide airborne geophysical data merged and reprocessed in January 2022 between Mansounia (2004 survey) and Kiniero (2007 survey), providing an integrated magnetic dataset
over the entire Kiniero Gold District. Interpreted features provide further support for the structural frameworks within the Sabali-Mansounia mineralised corridor. Structures outlined at district
and deposit scale continue to provide strong correlation with soil geochemistry, with the identification of probable intrusives within and around the Sabali South deposit.
- The structural resolution of the data is notable, correlating the known geology and structural understanding against the developing BLEG gold-in-soil geochemical fabric.
Four styles of mineralisation have been identified from the completed drilling:
- supergene mineralisation developed above mineralised lodes that has consistently developed from surface to 20m-30m depth. These oxide supergene ores have high economic value and occur across the Sabali South deposit;
- classic West African greenstone gold stockwork mineralisation;
- deep connected high-grade lode systems; and
- intrusives hosting pervasive quartz-carbonate alteration and discrete quartz-sulphide stockworks.
- A robust geological model is characterised by a pronounced oxide weathering profile, which is deeply developed (>60m) in the east of the deposit. Beneath the
upper oxide layer is a hydrothermally altered sulphide ore unit that is mechanically similar to the overlying oxide, followed by saprock and fresh horizons.
- there are primary lithostratigraphic controls on early fluid movement, followed by secondary changes in permeability brought about by hydrothermal alteration, fracturing displaying differing levels of hydraulic brecciation, fluidisation, and quartz-sulphide veining; and
- continuity of mineralised structures is well understood, with assays and grades reporting to the mineralised intervals modelled as per the Sabali South
geological model section on section, corroborating the growing geological understanding and interpretation of the Sabali South deposit.
- Drilling has been completed across the “discovery” portion of the deposit on a 25m by 25m grid through 800m of strike and 400m of width since the acquisition by
Sycamore Mining, extending into the Mansounia License.
- previous wider spaced drilling by Gold Fields and Burey Gold on the Mansounia license-side of the deposit demonstrate the continuous extension of the mineralisation of the Sabali-Mansounia corridor. It remains open on strike to the north (~1km) and to the south (~4km); and
- results returned from the deeper holes (>150m) at Sabali South have intersected significant grades which have developed along major structures at depths
>100m vertically. There remains no evidence of grade attenuation at depth, but instead an increasingly focused ore‐shoot style of mineralisation in these structures that project to
Metallurgy results include 99% recoveries for oxides, 95% for transition and 80% for fresh rocks with the addition of carbon to mimic the CIL processing route. Previous
conventional cyanide leaching yielded recoveries of >80% in the oxide. Metallurgical testwork remains ongoing which is being supported by detailed petrological studies.
- In addition to the geological program, parallel mining geotechnical, metallurgy and geohydrology drilling studies have been completed or are underway to establish
preliminary deposit economics. Results from all these studies will be incorporated into the Kiniero Gold Project PFS, due for completion in June 2022, which will support a maiden
public Sabali South Mineral Resource and Mineral Reserve estimate.
Figure 1 : Kiniero Gold District Prospectivity, Deposit Locations and Neighbouring Properties.
Figure 2: Sabali South Plan Map with Drillholes, Downhole Grade Profiles (min. 0.3g/t Au, Pre-PFS Pit Shell), Section A-B Location and Locations of Selected Drillholes with Significant
Figure 3: Section A-B, a NW-SE long section through the centre of the Sabali South deposit.
Table 1 : Selected Highlighted Significant Drillhole Intercepts Across Sabali South (1-9 on plan map).
|1: RC20-191||6: SRC21-012|
|Northern Most Strike Extension RC Drillhole - Open Strike||Central Deposit - Strike Extension RC Drillhole|
|21m||@||1.39g/t||(25m to 47m)||29m||@||3.36g/t||(0m to 29m)|
|*including||7m||@||2.06g/t||(27m to 34m)||*including||15m||@||5.80g/t||(10m to 25m)|
|*including||4m||@||2.00g/t||(42m to 46m)|
|2: RC20-052||Central Deposit Infill RC Drillhole|
|Northeast Step-out Reconnaissance RC Drillhole||112m||@||2.68g/t||(0m to 112m)|
|10m||@||7.92g/t||(10m to 20m)||*including||32m||@||4.64g/t||(27m to 59m)|
|*including||13m||@||3.69g/t||(62m to 75m)|
|3: SRC21-080||*including||14m||@||4.24g/t||(78m to 92m)|
|Western Infill RC Drillhole|
|50m||@||1.86g/t||(15m to 65m)||8: SRC21-090|
|*including||27m||@||2.79g/t||(15m to 42m)||Southwestern Strike Extension RC Drillhole|
|7m||@||1.30g/t||(78m to 85m)||33m||@||3.12g/t||(25m to 58m)|
|7m||@||1.33g/t||(97m to 104m)||*including||17m||@||5.20g/t||(25m to 42m)|
|4: RC20-043||9: MRC21-006|
|Northeast Extension RC Drillhole||Strike Extension RC drillhole into Mansounia License|
|37m||@||1.39g/t||(46m to 83m)||19m||@||1.40g/t||(14m to 33m)|
|*including||12m||@||2.35g/t||(46m to 58m)||*including||3m||@||3.28g/t||(15m to 18m)|
|*including||10m||@||2.03g/t||(72m to 82m)||4m||@||1.61g/t||(58m to 62m)|
|2m||@||6.96g/t||(79m to 81m)|
|Central Deposit Diamond Drillhole|
|13m||@||2.70g/t||(0m to 13m)|
|9m||@||1.39g/t||(90m to 99m)|
Justin Glanvill (MSc (Eng), Pr.Sci.Nat.), Mineral Resource Manager for Sycamore Mining, is the Qualified Person (QP) for the Company as defined by National Instrument 43-101 and has approved the technical disclosure contained in this press release.
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