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Resolute Mining Limited — Capital/Financing Update 2015
Mar 31, 2015
10548_rns_2015-03-31_1410357b-62fd-4e87-8265-eba91f1304ae.pdf
Capital/Financing Update
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ASX Announcement
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1 April 2015
Further Significant High Grade Drill Results at Bibiani Gold Project
Highlights
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Further significant high grade intersections from the surface and diamond drill program at Bibiani including; 78.1m @ 3.07g/t Au from 346.9m , 19.2m @ 7.69g/t Au from 436.8m, and 29.6m @ 4.05g/t Au from 146m
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Underground drilling has delineated a continuous high grade zone within the Central Lode over a strike length of 500m, whilst surface drilling has highlighted a robust high grade area north of the modern underground development
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Drill campaign completed and revised block modelling has commenced with the aim of confirming and enhancing the previously reported 1.7Moz Resource
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Scoping study has commenced and is due for completion in the June quarter aimed at assessing the most appropriate mining method, outlining any early higher grade underground development opportunities and assessing need for any further drilling
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Geotechnical, metallurgical and hydrological studies, will commence shortly as part of planned Underground Feasibility Study due to be completed mid 2016
Resolute Mining (ASX:RSG, “Resolute” or the “Company”) is pleased to announce additional broad high grade gold intersections from the final round of its major resource drill program at the Bibiani Gold Project (“Bibiani”) in Ghana. This phase of the drilling campaign has now concluded with a total of 26,665m drilled.
Following overall strong results from the drilling campaign, the Company is now preparing an updated resource model, aiming to confirm and enhance the 15 August 2014 reported 1.7Moz underground resource.
Results from the latest drilling phase have further supported the significant high grade gold intersections from surface and underground drilling, previously announced on 20 November 2014 and 16 January 2015 including; 30.9m @ 13.32g/t Au from 276.7m, 40m @ 20.62g/t Au from 431m, 22m @ 11.81g/t Au from 109m, 27.8m @ 8.49g/t Au from 153m and 16m @ 12.46g/t Au from 34m.
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Significant intercepts from the recent drilling include;
| Hole ID | Intersection |
|---|---|
| BSDD022 | 7m @ 11.47g/t Au from 404m |
| BSDD025 | 19.2m @ 7.69g/t Au from 436.8m |
| BSDD027 | 12m @ 4.94g/t Au from 312m |
| BSDD027 | 12.9m @ 5.30g/t Au from 353.1m |
| BSDD027 | 15m @ 4.19g/t Au from 384m |
| BSDD030W2 | 78.1m @ 3.07g/t Au from 346.9m |
| BSDD032 | 12m @ 4.96g/t Au from 329m |
| BSDD032 | 17.9m @ 4.46g/t Au from 345.1m |
| BUDD051 | 29.6m @ 4.05g/t Au from 146m |
| BUDD056 | 23m @ 4.82g/t Au from 109m |
| BUDD057 | 16m @ 6.39g/t Au from 107m |
| BUDD064 | 20m @ 4.71g/t Au from 138m |
| BUDD069 | 16m @ 6.04g/t Au from 167m |
Note: Intersections are reported as down hole length and not true width. See JORC Table 1 for the relevant JORC Code 2012 disclosures including Section 1 “Sampling Techniques and Data” and Section 2 “Reporting of Exploration Results”. Details of the significant drilling intercepts have been provided in Table 1 and in Figures 1 & 2.
Resolute Chief Executive Officer, Peter Sullivan said “The drill program has proven to be very successful and has established the basis for an underground operation at Bibiani”.
Work Program and Results.
The major underground and surface diamond drilling program at Bibiani, which commenced in September 2014, was completed in February 2015 for 26,665 metres. The analytical results from all drill holes, plus QA-QC samples have been received and information has been imported and validated. Interpretation of the geometry of the mineralisation has been undertaken and the final wireframes have been finished.
Surface Drilling
Surface drilling since the previous announcement on 16 January 2015 concentrated on an area north of the modern underground workings between 5700N to 6000N. This area was earmarked as having the greatest potential to host a mineable inventory which could be accessible in the early phases of any proposed underground development.
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Better than expected intercepts were returned from holes between 5700N and 5800N where the previous resource model predicted much lower grades. An intersection of 78.1m @ 3.07 g/t Au from 346.9m was intersected in BSDD030W2 on 5750N, and supported by 19.2m @ 7.69 g/t Au from 436.8m in BSDD025, 50m to the south.
Underground Drilling
Underground drilling since January 2015 has continued testing the Central and Eastern Lodes from positions in the 9 level.
Wide zones of high grade gold continue to come from underground drilling into the Central Lode with greater than 100 gram metre intervals from underground holes BUDD051 (29.6m @ 4.05g/t from 146m), BUDD056 (23m @ 4.82g/t from 109m) and BUDD057 (16m @ 6.39g/t from 107m).
The underground drilling has now identified a continuous high grade zone of mineralisation within the Central Lode between 11 and 14 levels with a total strike length of 500m (5000N to 5500N).
Looking Forward
Work has commenced on a revised resource block model aimed at confirming and enhancing the 15 August 2014 reported 1.7Moz underground resource previously prepared by Coffey Mining Pty Ltd.
The Company with the assistance of Snowden’s Perth has commenced a scoping level study due for completion during the June quarter to assess the most appropriate mining method, outline any early underground development opportunities, and assess whether any further drilling is required in the short term.
Geotechnical, metallurgical and hydrological studies will commence shortly, with the Underground Feasibility Study on track to be completed mid-2016.
PETER SULLIVAN Chief Executive Officer
About Resolute:
Resolute is an unhedged gold miner with two operating mines in Africa and Australia. The Company is one of the largest gold producers by volume listed on the ASX with FY15 guidance of 315,000 ounces of gold production at a cash cost of $890/oz. Resolute’s flagship Syama project in Mali is on track for an increase in production to 270,000oz of gold a year following the recent addition of the oxide circuit to the processing plant. At its Ravenswood mine in Queensland Resolute is investigating a number of opportunities to add value by increasing gold production and lowering operating costs. In Ghana, the Company is now the owner and operator of the advanced Bibiani gold project where work is being undertaken on an underground feasibility study including a 25,000m drill program. The Company controls an extensive footprint along the highly prospective Syama Shear and Greenstone Belts in Mali and Cote d’Ivoire. Resolute has also identified a number of highly promising exploration targets at its Ravenswood operations and holds a number of exploration projects in Tanzania surrounding its now completed Golden Pride mine.
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Table 1 Significant Results at Bibiani
| Hole_ID | North (WGS) |
East (WGS) |
RL (m) |
Dip | Azi (WGS) |
EOH (m) |
From (m) |
To (m) |
Width (m) |
Au (g/t) |
|---|---|---|---|---|---|---|---|---|---|---|
| BSDD020 | 715785 | 574602 | 243 | ‐63 | 121 | 485.4 | 426 | 429 | 3 | 1.02 |
| 451 | 454 | 3 | 1.40 | |||||||
| BSDD021 | 715141 | 574844 | 223 | ‐64 | 301 | 504.4 | 329 | 339 | 10 | 1.27 |
| 346 | 354 | 8 | 1.36 | |||||||
| 372 | 379.3 | 7.3 | 1.26 | |||||||
| 415 | 427 | 12 | 1.23 | |||||||
| 431 | 440 | 9 | 1.24 | |||||||
| BSDD022 | 714973 | 574827 | 227 | ‐61 | 302 | 520.2 | 354 | 360 | 6 | 3.81 |
| 387.8 | 393.85 | 6.05 | 1.75 | |||||||
| 404 | 411 | 7 | 11.47 | |||||||
| BSDD023 | 715811 | 574661 | 245 | ‐66 | 125 | 451.4 | 320 | 324 | 4 | 2.69 |
| BSDD024 | 715497 | 574763 | 220 | ‐72 | 303 | 327.5 | 196 | 201 | 5 | 0.96 |
| 212 | 225 | 13 | 1.27 | |||||||
| 231.1 | 250 | 18.9 | 1.15 | |||||||
| 255.8 | 270 | 14.2 | 3.59 | |||||||
| BSDD025 | 715027 | 574845 | 225 | ‐62 | 300 | 469.9 | 2 | 6 | 4 | 1.61 |
| 323.2 | 326.75 | 3.55 | 18.71 | |||||||
| 404 | 408 | 4 | 1.29 | |||||||
| 436.8 | 456 | 19.2 | 7.69 | |||||||
| BSDD027 | 715211 | 574831 | 223 | ‐57 | 301 | 420.6 | 4 | 9 | 5 | 2.30 |
| 312 | 324 | 12 | 4.94 | |||||||
| 353.1 | 366 | 12.9 | 5.30 | |||||||
| 384 | 399 | 15 | 4.19 | |||||||
| 407 | 414 | 7 | 1.66 | |||||||
| BSDD029 | 715409 | 574802 | 222 | ‐59 | 303 | 348.6 | 270.7 | 278 | 7.3 | 1.04 |
| 309 | 317 | 8 | 4.49 | |||||||
| 325 | 337 | 12 | 1.40 | |||||||
| BSDD030 | 715076 | 574852 | 224 | ‐57 | 301 | 385.5 | 305 | 316 | 11 | 1.81 |
| 346.58 | 379 | 32.42 | 3.48 | |||||||
| BSDD030W2 | 715076 | 574852 | 224 | ‐57 | 301 | 504.3 | 308 | 320 | 12 | 2.15 |
| 346.9 | 425 | 78.1 | 3.07 | |||||||
| 430 | 445 | 15 | 2.61 | |||||||
| BSDD032 | 715273 | 574828 | 220 | ‐56 | 302 | 459.6 | 310 | 314 | 4 | 7.03 |
| 329 | 341 | 12 | 4.96 | |||||||
| 345.1 | 363 | 17.9 | 4.46 | |||||||
| 379 | 387 | 8 | 2.43 | |||||||
| BSDD033 | 714455 | 574437 | 231 | ‐53 | 302 | 450.4 | 292 | 297 | 5 | 5.57 |
| BUDD045 | 714988 | 574466 | ‐39 | ‐11 | 124 | 191.6 | 15 | 34 | 19 | 2.64 |
| 60 | 65 | 5 | 1.40 | |||||||
| 78 | 81 | 3 | 11.28 | |||||||
| 149 | 153 | 4 | 2.53 | |||||||
| BUDD046 | 715088 | 574521 | 21 | ‐17 | 303 | 127.6 | 15 | 19 | 4 | 2.52 |
| 108 | 113 | 5 | 1.05 | |||||||
| BUDD047 | 715089 | 574521 | 21 | ‐35 | 303 | 140 | 114 | 117 | 3 | 2.90 |
| BUDD048 | 714988 | 574466 | ‐40 | ‐40 | 123 | 279.3 | 14 | 25 | 11 | 1.38 |
| 97 | 102 | 5 | 2.07 | |||||||
| BUDD050 | 715088 | 574521 | 20 | ‐70 | 304 | 171 | 68 | 74 | 6 | 2.19 |
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| 159 | 162 | 3 | 5.54 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| BUDD051 | 714988 | 574465 | ‐40 | ‐61 | 123 | 296.9 | 26 | 33 | 7 | 4.89 |
| 41 | 44 | 3 | 2.76 | |||||||
| 146 | 175.6 | 29.6 | 4.05 | |||||||
| BUDD052 | 714912 | 574433 | ‐39 | ‐10 | 129 | 190.5 | 13 | 21 | 8 | 1.28 |
| 75 | 81 | 6 | 2.83 | |||||||
| BUDD054 | 714942 | 574453 | ‐39 | ‐11 | 123 | 104.2 | 13 | 21 | 8 | 2.76 |
| 44 | 60 | 16 | 1.71 | |||||||
| BUDD055 | 714942 | 574452 | ‐40 | ‐32 | 124 | 74.8 | 7 | 12 | 5 | 2.92 |
| BUDD056 | 714912 | 574433 | ‐40 | ‐58 | 127 | 240 | 29 | 32 | 3 | 2.16 |
| 109 | 132 | 23 | 4.82 | |||||||
| BUDD057 | 714943 | 574452 | ‐40 | ‐57 | 123 | 353.7 | 107 | 123 | 16 | 6.39 |
| BUDD059 | 714830 | 574395 | ‐40 | ‐54 | 122 | 190.2 | 18 | 30 | 12 | 1.30 |
| 50 | 60 | 10 | 1.49 | |||||||
| 78 | 91 | 13 | 3.20 | |||||||
| 98 | 105 | 7 | 5.02 | |||||||
| 109 | 114 | 5 | 5.50 | |||||||
| BUDD060 | 714942 | 574452 | ‐40 | ‐36 | 123 | 230.8 | 7 | 12 | 5 | 4.69 |
| 16 | 21 | 5 | 1.26 | |||||||
| 52 | 56 | 4 | 1.42 | |||||||
| 76 | 89 | 13 | 4.97 | |||||||
| BUDD061 | 715089 | 574521 | 23 | 15 | 303 | 140.3 | 14 | 25 | 11 | 4.47 |
| 111 | 114 | 3 | 1.50 | |||||||
| BUDD062 | 714992 | 574458 | ‐39 | ‐10 | 303 | 100.5 | 63 | 68 | 5 | 2.06 |
| BUDD064 | 714743 | 574337 | ‐40 | ‐57 | 151 | 251.5 | 51 | 56 | 5 | 2.55 |
| 75 | 82 | 7 | 2.81 | |||||||
| 99 | 102 | 3 | 6.33 | |||||||
| 110 | 121 | 11 | 1.81 | |||||||
| 138 | 158 | 20 | 4.71 | |||||||
| BUDD065 | 714992 | 574459 | ‐40 | ‐62 | 303 | 162.8 | 114 | 117 | 3 | 7.59 |
| BUDD066 | 714930 | 574372 | ‐7 | ‐72 | 130 | 295.8 | 152 | 157 | 5 | 1.87 |
| BUDD067 | 714817 | 574270 | 21 | ‐60 | 123 | 300 | 201 | 207 | 6 | 0.89 |
| 211 | 216 | 5 | 2.27 | |||||||
| 263 | 267 | 4 | 1.26 | |||||||
| 274 | 299.7 | 25.7 | 2.74 | |||||||
| BUDD068 | 714930 | 574373 | ‐7 | ‐60 | 117 | 250.1 | 122 | 127 | 5 | 2.54 |
| 205 | 213 | 8 | 1.28 | |||||||
| 237 | 250.1 | 13.1 | 1.91 | |||||||
| BUDD069 | 714817 | 574270 | 21 | ‐51 | 123 | 230.4 | 74 | 78 | 4 | 0.97 |
| 167 | 183 | 16 | 6.04 | |||||||
| 195 | 199 | 4 | 2.45 | |||||||
| 226 | 229 | 3 | 2.47 |
Notes to Accompany Table 1:
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Grid coordinates are WGS84 Zone 30 North
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Cut‐off grade for reporting of intercepts is >1g/t Au with a maximum of 3m consecutive internal dilution included within the intercept; only intercepts >=3m are reported
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No top cut of individual assays prior to length weighted compositing of the intercept has been applied
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• Samples are analysed for gold by FA25/AAS method which is a 25g fire assay with AAS instrument finish
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Competent Persons Statement
The information in this report that relates to the Exploration Results, Mineral Resources and Ore Reserves is based on information compiled by Mr Richard Bray who is a Registered Professional Geologist with the Australian Institute of Geoscientists and Mr Andrew Goode, a member of The Australian Institute of Mining and Metallurgy. Mr Richard Bray and Mr Andrew Goode both have more than 5 years’ experience relevant to the styles of mineralisation and type of deposit under consideration and to the activity which they are undertaking to qualify as a Competent Person, as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Mr Richard Bray and Mr Andrew Goode are full time employees of Resolute Mining Limited Group and each hold equity securities in the Company. They have consented to the inclusion of the matters in this report based on their information in the form and context in which it appears.
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A proven gold producer
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BIBIANI GOLD MINE GHANA
JORC Code, 2012 Edition – Table 1
Section 1 Sampling Techniques and Data
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Sampling 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. |
Recent data (Mensin Gold 2014) is collected from reverse circulation (RC) and diamond core (DD) drill holes. Previous data (Noble Mineral Resources Limited 2011-2012) was collected from RC and DD drill holes, and historic data (1994-2007) from RC, DD and underground channel sampling (CHAN). During the period of prior owners the RC, DD and CHAN drilling and sample collection is assumed to have been completed to industry standards at that time. The Bibiani mine has been operating since the early 1920’s and limited sampling technique data has been recorded by previous owners over periods of its history. During 2010-2012, Noble Mineral Resources Ltd sampled RC interval as four metre composites which were subsequently resampled at one metre intervals were required, while diamond core was cut in half and sampled on variable interval lengths. Mensin Gold (2014) have conducted reverse circulation (precollars only) and diamond drilling since August 2014. For RC samples each 1m interval is riffle split to obtain a 2-4kg sample, which is sent to the laboratory for pulverisation to produce a 30g charge for analysis. Diamond core are sampled on one metre intervals, defined by geologists to ensure the interval does not cross geological contacts. Core is cut into half to provide a 2-4kg sample which is sent to the laboratory for crushing, splitting and pulverising to 85% passing 75 microns, to provide a 30g charge for analysis. Sampling and sample preparation protocols for Mensin Gold drilling are industry standard and are deemed appropriate by the Competent Person. QAQC samples are included with all sample batches. |
| 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.). |
The Bibiani Main Zone deposit was modelled by Coffey Mining Pty Ltd using a subset of regional data comprising of 621 DD holes (244 Underground, 377 Surface), 724 RC holes and 244 Underground CHAN sampling runs. Core type and size has been recorded for some historic holes, but many holes do not have this data recorded. Mensin Gold completed 23 holes for 5,605 metres by RC (775m) and diamond drilling methods (4830m) between September and October 2014. Core type and core size has been included in the drilling database and comprises HQ and NQ2 core sizes. |
| 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. |
In the historical data, sample recovery was not reported and it is unknown if this data was collected. Where stopes or voids have been intersected, this was noted in the drilling log. Any additional measures taken to ensure samples are representative has not been documented in company records. Any historical relationship between sample recovery and grade was not identified in company records. Mensin Gold (2014) has recorded diamond core and RC recovery in the database. Diamond core recovery is compromised in areas immediately adjacent to old underground workings and separate void intervals are identified in the database where possible from driller records. Void intervals are allocated zero Au grade. During logging operations diamond core is assembled into continuous runs for orientation work allowing down hole depths and sample recovery to be determined. |
| Logging | • Whether core and chip samples have been geologically and |
Logging records lithology, alteration and mineralisation details for RC, DD holes and underground channel samples. |
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| 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. |
From 2014 Mensin Gold has recorded structural and geotechnical rock mass features for diamond core. Drill core is photographed in both dry and wet form. Diamond core and RC chips are digitally logged, then validated and imported into the drill hole database. Holes were logged in their entirety (100%). |
|
|---|---|---|
| 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. |
Historic RC samples were split using a riffle (dry) to obtain a 2-4kg sample. Sample moisture content was not recorded. More recent grade control RC samples were sampled wet and dry where identified, otherwise assumed to be dry. All samples were riffle split unless recorded otherwise. Spear sampling was used in some cases for wet samples. Underground channel samples are assumed to have been taken from walls and faces using industry standard methods. RC intervals are riffle split (dry) to obtain a 2-4kg sample, which are sent to the laboratory for pulverising. Diamond core was sampled at one metre intervals and cut in half to obtain a 2-4kg sample which is sent to the laboratory for crushing, splitting, pulverising and assaying. The sampling techniques for RC, DD and underground channel samples appear appropriate. Where they are unknown, best practice was assumed. Historic sample intervals were commonly 5 or 10 feet, (stored as 1.5 or 3 meters in the current database). Recent RC drilling has been sampled using 4 meter composites, and then resampled at one metre intervals as required. Analysis of sample sizes determined they appeared appropriate. Best practice was assumed at the time of historic RC, DD and underground channel sampling. Sampling, sample preparation and quality control protocols are industry standard and all attempts are made to ensure an unbiased representative sample is collected. The methods applied in this process are deemed appropriate by the Competent Person. |
| 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. |
RC and DD samples were assayed for gold by Intertek Tarkwa FA25/AAS method which is a 25g fire assay fusion with AAS instrument finish. This analytical method is appropriate for the style of mineralisation. Methods for historic RC and DD holes included fire assay and AAS finish. During 2010-2013 regional and grade control RC drilling used a combination of bulk leach with AAS finish or fire assay with AAS finish. These methods appear suitable for determining gold concentrations of this type. Noble Gold samples were submitted to Intertek and ALS Ghana and Performance Laboratories (Ghana) Ltd for assay analysis. Historically samples have been analysed by Analabs, SGS, and onsite laboratory (Performance Laboratories). No geophysical tools were used to determine any elemental concentrations. Quality control (QC) procedures included the use of certified reference standards and blanks inserted at a rate of one in twenty samples. Field duplicates are taken for RC and diamond core at the rate of 1:20. Umpire pulp analysis of 2-5% of pulps is performed by a second laboratory at the completion of a drill program to verify the results from the primary laboratory. Laboratory quality control data, including laboratory standards, blanks, duplicates, repeats and grind size results are also captured into the digital database and analysed for accuracy and precision. Analysis of the QC sample assay results indicates that an acceptable level of accuracy and precision has been achieved. Maxwell GeoServices completed aQAQC audit for CoffeyMiningand Noble Mineral Resource in Nov 2011 and determined |
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| historic sampling and laboratory practises used were of industry standard. Coffey Mining Pty Ltd reviewed the available QAQC reports in 2012 and concurred with the conclusions and recommendations of Maxwells. Coffey Mining notes that the positive and negative assay bias that was calculated by Maxwell GeoServices included data with mislabelled CRM. Coffey Mining recommended that bias be calculated after eliminating those results which can reasonably be attributed to mislabelled CRM. Coffey Mining also concluded that while the available QAQC data demonstrates acceptable levels of assay precision and accuracy, this was considered only marginally acceptable and considerable room for improvement existed. |
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|---|---|---|
| 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. |
Verification of significant intersections was completed by company personnel and Coffey Mining personnel. No drill holes within the resource were twinned. Drill holes were logged onto paper templates, validated and then entered into a relational SQL 2008 database using DataShed data management software (Maxwell GeoServices). The data management software has a variety of verification protocols which are used to validate the data entry. The DataShed drill hole database was backed up on a daily basis to the head office server. Assay result files were reported by the laboratory in CSV format or hardcopy and are imported into the SQL database without adjustment or modification. |
| 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. |
Collar coordinates are surveyed in UTM (WGS84) by registered mine surveyors using electronic survey equipment. Down hole surveys are collected every 30-50m using Reflex single shot and multi shot instruments. Location coordinates and azimuth bearings are reported in UTM WGS84 Zone 30 North. Bibiani Mine Grid is a locally established grid based on mining operations and is the principal grid system used on the site. |
| 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. |
Drill hole spacing was sufficient to demonstrate geological and grade continuity appropriate for the Mineral Resource and the classifications applied under the JORC Code. The appropriateness of the drill spacing was reviewed earlier by the Coffey technical team in 2012 and more recently by the Competent Person. RC and diamond samples were collected or composited to 1m intervals. |
| 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. |
Holes are drilled predominantly perpendicular to mineralised domains where possible. No orientation based sampling bias has been identified in the data. |
| Sample security | • The measures taken to ensure sample security. |
Sample Chain of Custody is managed by Bibiani Project personnel. RC and diamond samples were collected from the drill location and stored on site before being securely dispatched to the commercial laboratory by specialised transport. |
| Audits or reviews | • The results of any audits or reviews of sampling techniques and data. |
An external audit of sampling procedures was conducted by Maxwell GeoServices and external consultants Coffey Mining indicated sampling protocols remain within industry standards. |
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Section 2 Reporting of Exploration Results
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Mineral tenement and land tenure status |
• Type, reference name/number, location and ownership including agreements or material issues with third parties such as joint ventures, partnerships, overriding royalties, native title interests, historical sites, wilderness or national park and environmental settings. • The security of the tenure held at the time of reporting along with any known impediments to obtaining a licence to operate in the area. |
Drilling was conducted within the Ghanaian Mining Concession Permit of Bibiani which covers the current mining leases of the Bibiani Project. Resolute Mining Limited has a 90% interest in the Bibiani Project through its subsidiary company Mensin Gold Bibiani Limited and the Exploitation Permit on which it is based. The Ghana Government holds a free carried 10% interest in Mensin Gold Bibiani Ltd (MGBL). The Bibiani Mine concession is located approximately 6° 27’ latitude north and 2° 17’ longitude west in the Western Region of Ghana. The Bibiani mineral concessions lie approximately 80 kilometres south west of the Ashanti capital, Kumasi. The principal access to the mine is from the east, along the Kumasi – Bibiani – Sefwi Bekwi Highway. Ghana mining law provides that all mineral resources are administered bythe Minerals Commission of Ghana. |
| Exploration done by other parties |
• Acknowledgment and appraisal of exploration by other parties. |
Commercial gold production commenced at Bibiani in the early 1900s and was suspended in 1915. In 1927 mining activities recommenced as the mine was developed and operated by foreign investors until it was nationalized in 1958. Post nationalisation, the mine was operated by SGMC (State Gold Mining Corporation) until it was closed in 1973 following the depletion of economic reserves. During the SGMC period, reserves within the existing infrastructure were depleted and the old workings were reworked to recover pillars and remnant lower grade material (probably plus 6g/t) that was below the pay limit applied to the deposit prior to nationalisation. Reports have suggested that during the first 65 years of production a total of 7.8 million tonnes from underground mining and 0.5million tonnes from surface operations were milled, producing over 2 million ounces of gold at an average recovered grade of approximately 9.5 g/t Au. In the late-1980s, Glamco and International Gold Resources (“IGR”) gained rights to the old Bibiani mine and initiated tailings reclamation and surface exploration, which activities led to the delineation of an open pit resource and a positive feasibility study. Ashanti Goldfields purchased Bibiani from IGR in the mid-1990s for US$ 130 million, financed an additional US$ 85 million to capitalize the operation, and redeveloped the mine as an open pit operation with a modern processing plant. Ashanti Goldfields (now AngloGold Ashanti (“AGA”)produced approximately 1.8 million ounces of gold from the main and satellite pits (after main pit production was hampered by a slope failure in 2004) and tailings retreatment, bringing total Bibiani production since inception to almost four million ounces. Central African Gold plc (CAG ) purchased Bibiani, for a cash consideration of US$ 40 million. Subsequent to acquisition, CAG expended a further US$ 51 million of capital on the mine, nearly all of which was used to accelerate underground access and to purchase a modern underground mining fleet. Despite development and capital constraints Bibiani produced a further 53,066 oz. of gold between 2007 and 2008 from three sources, namely old tailings, underground ore, and near- mine open cast oxide ore not included in the mineral resources. In late 2009, Noble Mineral Resources Ltd signed a ‘Sale of Shares’ agreement to acquire Central African Gold Ghana Ltd from Investec Bank subject to a number of Conditions. One of these Conditions states that Noble shall formulate a ‘Development Plan’ for the development of and the return to production of the Bibiani mining and processing operations. Resolute Mining Ltd became the owner of the Bibiani Project in June 2014 following the completion of the Deed of Company Arrangement (DOCA) regarding Noble Mineral Resources Limited (ASX:NMG) and acceptance and approval of a scheme of arrangement in Ghana. |
| Geology | • Deposit type, geological setting and style of mineralisation. |
The license area is underlain by metasedimentary rocks of the Lower Birimian in the eastern parts and by intercalated metasedimentary and metavolcanic rocks of the Upper Birimian in the western part of the license. Granites occur in the south‐western corner of the license. The Lower Birimian sediments consist mainly of phyllites with intercalated greywackes and minor tuffs,while the Upper Birimian rocks consist of basalt to rhyolites flows with intercalated tuffs and |
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| minor phyllites and chert horizons. Diorite intrusives are found within the Upper Birimian metavolcanic rocks. In the southern part of the license the rocks strike about 20º to 30º E and dip steeply to the southeast. Further to the north the strike changes to between 40º and 50º E. Previous mapping identified several cross faults that offset the stratigraphy however there is no clear evidence of a relationship between these faults and the gold mineralisation. The Bibiani ore body trend continues north to the Pamunu River approximately two kilometres from the Bibiani Mine. A parallel splay off the Bibiani trend continues obliquely to the Bibiani North deposit one kilometre to the north of the Bibiani MiningLease. |
||
|---|---|---|
| Drill hole Information | • A summary of all information material to the understanding of the exploration results including a tabulation of the following information for all Material drill holes: oeasting and northing of the drill hole collar oelevation or RL (Reduced Level – elevation above sea level in metres) of the drill hole collar odip and azimuth of the hole odown hole length and interception depth oWhole length. • If the exclusion of this information is justified on the basis that the information is not Material and this exclusion does not detract from the understanding of the report, the Competent Person should clearly explain why this is the case. |
All information including easting, northing, elevation, dip, azimuth, coordinate system, drill hole length, interval length and depth are measured and recorded in UTM Zone 30N WGS84. Accuracy of the survey measurements is considered to meet acceptable industry standards. Information provided for the Exploration drillhole results includes : 1. Easting, Northing and RL of the drill hole collars are measured and recorded in UTM Zone 30N (WGS84). 2. Dip is the inclination of the drill hole from horizontal. For example a drill hole drilled at -600is 600from the horizontal. 3. Down hole length is the distance down the inclination of the hole and is measured as the distance from the horizontal to end of hole. 4. Intercept depth is the distance from the start of the hole down the inclination of the hole to the depth of interest, assayed interval of interest or start of reported significant intercept. |
| Data aggregation methods |
• In reporting Exploration Results, weighting averaging techniques, maximum and/or minimum grade truncations (e.g. cutting of high grades) and cut-off grades are usually Material and should be stated. • Where aggregate intercepts incorporate short lengths of high grade results and longer lengths of low grade results, the procedure used for such aggregation should be stated and some typical examples of such aggregations should be shown in detail. • The assumptions used for any reporting of metal equivalent values should be clearly stated. |
Significant intercepts are calculated using a lower cutoff value of Au=1.0 g/t. No top cuts have been used. Internal waste up to a maximum of 3m consecutive internal dilution can be included within the intercept. Intercepts >=3m and with ‘grade x width’ > 10 gram metres are reported. Historic mining voids or backfill have been included within intercepts but grades have been set at Au=0.0g/t. Void intervals up to 7.1m downhole are included in the table of Exploration Results. Metal equivalent reporting was not used. |
| Relationship between mineralisation widths and intercept lengths |
• These relationships are particularly important in the reporting of Exploration Results. • If the geometry of the mineralisation with respect to the drill hole angle is known, its nature should be reported. • If it is not known and only the down hole lengths are reported, there should be a clear statement to this effect (e.g. ‘down hole length, true width not known’). |
The mineralisation is steeply east dipping at approximately 700from the horizontal, although there are examples with sub- vertical and west dipping orientations. Drilling sections are designed to intersect the main mineralisation orthogonal to strike and dip. Surface drill hole azimuths were planned at mine grid 0900at a general inclination of -650west to intersect as close to perpendicular to the ore zone as possible. In general, true widths may be 50-90% of the downhole length. Some underground drillholes have been drilled as fans due to limited access. |
| Diagrams | • Appropriate maps and sections (with scales) and tabulations of intercepts should be included for any significant discovery being reported These should include, but not be limited to a plan view of drill hole collar locations and appropriate sectional views. |
Refer to the maps and sections provided with this report. |
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| Balanced reporting | • Where comprehensive reporting of all Exploration Results is not practicable, representative reporting of both low and high grades and/or widths should be practiced to avoid misleading reporting of Exploration Results. |
Comprehensive reporting of all drillholes is provided in tables accompanying this report. |
|---|---|---|
| Other substantive exploration data |
• Other exploration data, if meaningful and material, should be reported including (but not limited to): geological observations; geophysical survey results; geochemical survey results; bulk samples – size and method of treatment; metallurgical test results; bulk density, groundwater, geotechnical and rock characteristics; potential deleterious or contaminating substances. |
No geophysical and geochemical data are reported in this release as they are not deemed relevant to the release. All samples are measured for bulk density which has a mean value of 2.77 g/cm3and varies between 2.30 and 3.00 g/cm3. |
| Further work | • The nature and scale of planned further work (e.g. tests for lateral extensions or depth extensions or large-scale step-out drilling). • Diagrams clearly highlighting the areas of possible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive. |
Mensin Gold Bibiani Limited is continuing with an evaluation drilling program assessing the potential for an underground project using a combination of surface and underground drilling. |
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