CriteriaJORC Code ExplanationCommentarySampling techniques

• Nature and quality of sampling (e.g. cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc.). These examples should not be taken as limiting the broad meaning of sampling.
• Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used.
• Aspects of the determination of mineralisation that are Material to the Public Report.
• In cases where ‘industry standard’ work has been done this would be relatively simple (e.g. ‘reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay’). In other cases, more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (e.g. submarine nodules) may warrant disclosure of detailed information.

• Reverse circulation (RC) drill samples are collected every metre for the entire length of the borehole. All material from each meter was sampled via conical splitter attached to the RC rig cyclone. This produces a 2-3kg sub-sample which is collected in a prelabelled sample bag with sequential sample numbers.
• Historical RC sampling includes collecting the cyclone underflow sample, splitting in a rotary sample divider to generate a RC sub-sample with a mass of ±2.1 kg.
• HQ and NQ drill core samples are collected from half-drill core cut evenly lengthwise with a diamond saw at regular 1 m intervals. Sampling per geological contacts is permitted ± 0.2m either side of the meter mark. Samples are numbered and bagged before dispatch to the laboratory. Samples were consistently cut on a nominal 10 degree rotation from the orientation line mark on the core (where orientation available, otherwise a consistent cut-line is established) and the non-orientation/cut-line marked side of the core is submitted for assay.
• Samples were submitted to BIGS Laboratory in Ouagadougou after drying, the entire sample is crushed to 6 mm and pulverised to achieve 85% passing 106 μm. The pulverised samples are returned to site and rotary split to 1 kg for use as original samples and duplicates. Samples are returned to BIGS for Au determination by 1kg LeachWELL with atomic absorption spectrometry (AAS) finish.

Drilling techniques

• Drill type (e.g. core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc.) and details (e.g. core diameter, triple or standard tube, depth of diamond tails, face-sampling bit or other type, whether core is oriented and if so, by what method, etc.).

• RC drilling was undertaken using a contractor owned rig with auxiliary air. 4” or 4 1/2” face sampling hammers are used.
• Diamond drill core material from both surface drilling and pre-collars is collected from a combination of HQ and NQ diameter diamond drilling (collaring in HQ and change over to NQ diameter in fresh rock) obtained by wireline drilling with standard tube.
• Core orientations were completed using Reflex ACT III RD and ACTx orientation tools with the orientation line marked up at the rig side and reviewed by geologists in the core shed.

Drill sample recovery

• Method of recording and assessing core and chip sample recoveries and results assessed.
• Measures taken to maximise sample recovery and ensure representative nature of the samples.
• Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material.

• Diamond core recoveries are measured in the core trays and recorded as recovered meters and recovered % as part of the geological logging process. RC sample recovery was qualitatively logged with weights of bulk samples recorded at the rig side.
• Sample recovery and integrity was maximised by drilling with sufficient air pressure to maintain dry samples with holes stopped if significant water ingress. Dry, moist or wet samples are recorded in the database.
• Examination of the RC and DD composite grade distributions suggests a slight positive bias between the RC and DD composite sample populations at grades <0.15 g/t, and a negative bias between these two populations at grades higher than 0.20 g/t. These biases are not considered critical, and no correction factors were applied.

Logging

• Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies.
• Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc.) photography.
• The total length and percentage of the relevant intersections logged.

• Logging protocols were followed to a level of detail suitable for support of the Mineral Resource and Ore Reserve estimate. Both RC chip samples and core samples include quantitative analysis (Niton XRF) and photographs. Core sample logging included qualitative data such as lithology, weathering intensity, competence (RQD) and discontinuities.
• All reported drilling is logged in its entirety.

Sub-sampling techniques and sample preparation

• If core, whether cut or sawn and whether quarter, half or all core taken.
• If non-core, whether riffled, tube sampled, rotary split, etc. and whether sampled wet or dry.
• For all sample types, the nature, quality and appropriateness of the sample preparation technique.
• Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples.
• Measures taken to ensure that the sampling is representative of the in-situ material collected, including for instance results for field duplicate/second-half sampling.
• Whether sample sizes are appropriate to the grain size of the material being sampled.

• Core samples are collected from half-drill core cut lengthwise with a diamond saw.
• RC samples representing a 1/8 split of each meter drilled are collected from a rig-mounted cone splitter. Drilling is discontinued if dry sample is unable to be maintained.
• Field duplicates are collected from the RC rig splitter and inserted into the regular sample stream every 50 samples. Mineralised RC field duplicates for 2025 drilling are within 1 % of the original split. Lab-aware pulp duplicates a inserted every 25 samples for diamond core samples.
• For both RC and DD samples, the entire sample is crushed and pulverised with >85% passing 75microns.
• The 2-3 kg sample size is deemed appropriate given that the gold occurs as fine grained electrum.

Quality of assay data and laboratory tests

• The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total.
• For geophysical tools, spectrometers, handheld XRF instruments, etc., the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc.
• Nature of quality control procedures adopted (e.g. standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (i.e. lack of bias) and precision have been established.

• Reviews of the sampling, analytical, and quality assurance and quality control (QA/QC) protocols used on the RC and core programs have been completed and acceptable levels of accuracy have been achieved.
• No geophysical tools, spectrometers, or handheld XRF instruments have been used in the reported exploration results to determine chemical composition at a semi-quantitative level of accuracy. Assaying for gold is by the LeachWELL bottle roll cyanide leach method. Gold content in the solution is determined using atomic absorption analysis. For all the samples having liquor grade >0.2 g/t Au, the tail is washed, dried and a 50 g charge is split and submitted for assaying using a conventional fire assay procedure on 50 g sub-sample.
• The QA/QC protocol since 2011 is to submit 2% Blind Field Duplicates, 3% Blind Pulp Duplicates, 5% Lab Aware Pulp Duplicates, 2% Blind Blanks and 3% Blind Standards.
• The laboratory inserted commercial standards and completed repeat assays. Repeat or duplicate analysis for samples shows that the precision of samples is within acceptable limits, and a review of results from both laboratory and Company inserted commercial standards indicate acceptable levels of accuracy have been established.

Verification of sampling and assaying

• The verification of significant intersections by either independent or alternative company personnel.
• The use of twinned holes.
• Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.
• Discuss any adjustment to assay data.

• The Competent Person has confirmed the sample preparation, security, analytical procedures and QA/QC undertaken are adequate for the purposes of Mineral Resource estimation and that there are no factors that materially impact the reliability or accuracy of the dataset employed in the calculation.
• Data acquisition is completed on a combination of paper log sheets, and entry into a self-validating data entry software package (LogChief). Integrated datasets have been uploaded to the Company’s SQL hosted database and archived on physical back-up drives.
• There are no twinned holes.
• Below detection limit values (negatives) have been replaced by background values.

Location of data points

• Accuracy and quality of surveys used to locate drill holes (collar and down-hole surveys), trenches, mine workings and other locations used in Mineral Resource estimation.
• Specification of the grid system used.
• Quality and adequacy of topographic control.

• The borehole collars are spotted in the field and pegged using a differential global positioning system (DGPS) set to achieve sub-metre accuracy. Post drilling, the completed holes are surveyed by Bomboré mine surveyors using Trimble GNSS with correction by real time kinematic (RTK) to ensure sub decimeter accuracy.
• Grid system is based on the UTM30N grid on the WGS84 ellipsoid. Down hole surveys were undertaken by the Company using a Reflex Ez-Trac tool and Reflex OMNI Gyro with readings measured in continuous and multishot mode with readings taken between 10-30m. Holes are validated in IMDEX Hub prior to inclusion in the drillhole database. Azimuths measured using magnetic fields are converted to a geographic azimuth using the declination applicable at the time of the survey.

Data spacing and distribution

• Data spacing for reporting of Exploration Results.
• Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied.
• Whether sample compositing has been applied.

• Data spacing is variable across the deposit, ranging from 50x50m at the periphery to 25x25m in the more densely drilled core.
• The oxide resources have been defined along 50 m-spaced drill sections with 25 m between the drill collars. The hard rock resources have been defined generally along 50 m-spaced drill sections with 50 m between the drill collars.
• Drill samples were composited to 1m for use in resource estimation. Mining at Bomboré has demonstrated reasonable continuity over a strike of 10 km at a cut-off grade of 0.15 g/t Au. At this cut-off grade, the gold mineralisation forms corridors 500 m to 1,000 m in length and 10 m to 100 m in width. At a cut-off grade of 0.5 g/t Au, the higher-grade subdomains have a strike length of up to 500 m and a width typically between 5 m and 30 m.
• Support of the strong continuity of mineralisation along strike has been confirmed by mining production and mapping of pit walls and floors.

Orientation of data in relation to geological structure

• Whether the orientation of sampling achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type.
• If the relationship between the drilling orientation and the orientation of key mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material.

• In all areas, the drilling direction is opposite to the dip and orthogonal to the average strike of the lithological units, major fabrics, and wireframed mineralised domains. The plunge of the boreholes at the collar is generally 50° ±5°, thereby intersecting the lithological units, major fabric and wireframed mineralised domains at an angle between 65° and 90°.
• No sampling bias was deemed to have occurred.

Sample security

• The measures taken to ensure sample security.

• Strict security measures are applied throughout the sampling, sample preparation, and analytical stages. The RC samples and the drill core retrieved by the drillers are collected and handled at the drill site by Orezone personnel. The sample bags are transported by a dedicated driver to a secure storage area in the Bomboré Gold Project area. The sample storage area at the Bomboré Gold Project is fenced and a watchman provides full-time security. Finally, the samples are dispatched to the analytical laboratories under the direct control of Orezone staff, who monitor the preparation and shipment of the samples. This procedure ensures reasonable chain of custody by Orezone from the drill sites to the analytical laboratory.

Audits or reviews

• The results of any audits or reviews of sampling techniques and data.

• In 2017, Mr Yassa collected 50 samples from 15 RC boreholes and 35 cored boreholes during the site visit for independent analysis of gold content. There was a good correlation between the independently collected verification samples analysed at SGS and the Orezone data.