CD-264 returns 12.6m @ 15.5g/t AuEq from 43.3m in Northwest Extension
LONDON, UK / ACCESSWIRE / July 11, 2023 / Meridian Mining UK S (TSX:MNO, Financial)(OTCQX:MRRDF, Financial)(Frankfurt/Tradegate:2MM) ("Meridian" or the "Company") is pleased to provide an update on its programs at CabaƧal, where CD-264 has returned further strong results from the CabaƧal Northwest Extension ("CNWE"). CD-264 has intersected a high-grade zone of 12.6m @ 15.5g/t AuEq (15.3g/t Au, 0.2% Cu & 0.6g/t Ag) from 43.3m, representing a northern extension of similar high-grade results (CD-049, CD-072[1]). This and additional results in the mine area show the potential to better define the projection of higher grade trends across the deposit. In parallel with the resource development program, the Company is advancing with exploration of near-mine extensions, with a copper gossan identified at surface, located 350m southeast of CD-240's copper feeder zone. Drilling has also confirmed the mineralized position of the VMS horizon in a 1km step-out to the southeast of the CabaƧal mine.
Highlights Reported Today
CabaƧal Northwest Extension returns more high-grade gold intersections;CD-264 returns 12.6m @ 15.5g/t AuEq (15.3g/t Au, 0.2% Cu & 0.6g/t Ag) from 43.3m;New results consolidate domain of high-grade mineralization extending over 175m;1km step-out along the CabaƧal trend intersects a base metal horizon correlative with the CabaƧal system;CD-255 drill hole adds context for further exploration for VMS sulphide mounds;Arrival of Geonics down-hole probe to assist in targeting thicker Cu-Zn-Ag-Au zones;Preparations advance for mobilization of new Santa Helena drill rigContractor representative due on site this month to prepare for mobilization of regional drill rig, with program to commence at Santa Helena;Program targeting verification of historic drilling and exploratory holes into satellite zones surrounding the historic resource ; andCabaƧal development studies are advancing in preparation for submission of the Environmental Impact Assessment for the consideration of up to 4.5Mtpa expanded production scenario.Dr. Adrian McArthur, CEO, comments: "The CD-264 high-grade result of 12.6m @ 15.5g/t AuEqfrom 43.3m shows the value of infill drilling in achieving better definition of shallow high-grade trends within the CabaƧal deposit. The result continues to build on the importance of the CNWE as a focal point for early production scenarios. We are advancing CabaƧal vigorously on multiple fronts, with drilling, with geotechnical evaluation, and with environmental studies to support expanded production scenarios to be evaluated in a PEA update. Our goal remains to continue moving CabaƧal on its pathway to development, whilst laying the foundation to realize the broader discovery potential of this under-explored belt."
CabaƧal Resource and Extensions
The drilling program at CabaƧal continues to follow recommendations arising from the PEA. The resource definition program aims to achieve better definition of the higher grade trends within the broader mineralized halo. The projection of the high-grade trend at shallowing depths in CD-264 returning 12.6m @ 15.5g/t AuEq from 43.3m is encouraging (Figure 1; Figure 2). Further drilling is being scheduled to test for the projection of the trend within the broader footprint of Cu-Au mineralization, both to the northwest and southeast where the drill spacing is currently more open.
Figure 1: Location of CD-264's intersection, extending the projection of the high-grade CNWE trend. Colour points represent drill assays plotted as AuEq (g/t) in plan view. Digital elevation image in the background.
Figure 2: Quartz veining in chloritic host rock associated with CD-264's intersection hosting visible gold.Additional drilling has been conducted in the Eastern Copper Zone ("ECZ"), where it was noted that the high-grade trends in the block model clustered around drill holes in areas of wider spacing, dropping off in-between. The new drill results show that basal concentrations of high-grade mineralization continue in these intervening areas (CD-256 & CD-263; Table 1). The cumulative effect of such results is expected to present a more accurate depiction of the higher grade population across the deposit as the drilling advances for the next resource update. The Company is currently conducting a Mise-a-la-Masse survey to follow up on the geophysical response of stringer sulphide mineralization in the ECZ, with the survey currently targeting extensions to the CD-254 result of 17.7m @ 1.6% CuEq / 2.4g/t AuEq from 50.0m[2].
Exploratory evaluation of the extensions of the CabaƧal system continues. CD-255 was a 1km step-out along the CabaƧal trend (Figure 3). It intersected a base metal horizon interpreted to be correlative with the CabaƧal system (5.3% Zn, 0.1% Cu, 0.2g/t Au & 32.4g/t Ag over 0.3m from 119.9m). The drill hole adds useful context for further planning of exploration for VMS sulphide mounds over time. The Company awaits the arrival of a down-hole probe from Geonics to assist in targeting thicker Cu-Zn-Ag-Au sulphide accumulations, which are less conductive than the copper dominant end member.
Recent prospecting by the geological team has also located some copper gossan at the south-west flank of the resource area (Figure 4). Drilling in this area is sparse, with wide-spaced historical BP holes not sampled systematically from surface. The gossan is located ~350m southeast of CD-240's copper feeder zone, possibly in an up-dip position to the CabaƧal South FLTEM conductivity anomaly[3], where the Company has drilled just one hole. Following recognition of the gossan, trenching will be undertaken to guide further drilling and evaluate possible links to the feeder system.
Figure 3: Drilling overview, with location of CD-255, pinpointing the open extension of the CabaƧal VMS horizon in a 1km step out from the resource area.Santa Helena
Preparations continue at Santa Helena in advance of the arrival of the fourth drill rig. The objective of the drilling program will be to conduct both validation drilling on historical resource holes, and a first phase of exploratory drilling on satellite drill targets marked by geophysical responses for potential discoveries satellite to the main resource.
Project Development
Project development studies are advancing in preparation for submission of the Environmental Impact Assessment (EIA-RIMA), positioning the project for the consideration of an expanded production scenario of up to 4.5Mtpa. Project development studies underway also include a 12-hole geotechnical drilling program. The PEA utilized default assumptions for pit will angles. Based on the PEA pit shell, a series of holes are being drilled to now gather specific data for the next phase of evaluation. If data supports a steepening of pit wall angles in a competent rock mass, results will have a positive impact on the stripping ratio.
Figure 4: Copper Gossan with portable XRF reading from surface float at the southwestern flank of the resource area.Table 1: Drilling results
Hole-ID | Dip | Azi | EOH | Zone | Int | AuEq | CuEq | Cu | Au | Ag | Zn | From |
(m) | (m) | (g/t) | (%) | (%) | (g/t) | (g/t) | (%) | (m) | ||||
CD-264 | -49 | 060 | 98.3 | CNWE | ||||||||
12.6 | 15.5 | 10.4 | 0.2 | 15.3 | 0.6 | 0.0 | 43.3 | |||||
14.7 | 0.6 | 0.4 | 0.2 | 0.3 | 0.6 | 0.0 | 65.5 | |||||
CD-263 | -70 | 048 | 104.1 | ECZ | ||||||||
4.0 | 0.3 | 0.2 | 0.2 | 0.0 | 1.3 | 0.0 | 66.9 | |||||
15.0 | 1.0 | 0.7 | 0.6 | 0.2 | 2.9 | 0.1 | 74.7 | |||||
Including | 4.0 | 2.5 | 1.7 | 1.4 | 0.5 | 7.1 | 0.1 | 85.4 | ||||
CD-262 | -49 | 045 | 49.3 | ECZ | ||||||||
2.6 | 0.5 | 0.3 | 0.3 | 0.1 | 1.1 | 0.0 | 17.0 | |||||
1.3 | 3.3 | 2.2 | 1.8 | 0.6 | 11.3 | 0.1 | 22.8 | |||||
CD-261 | -49 | 059 | 95.3 | CNWE | ||||||||
6.2 | 0.7 | 0.5 | 0.3 | 0.3 | 0.3 | 0.0 | 20.0 | |||||
13.0 | 0.8 | 0.5 | 0.3 | 0.4 | 1.0 | 0.0 | 40.1 | |||||
7.0 | 0.7 | 0.5 | 0.3 | 0.3 | 0.9 | 0.0 | 59.4 | |||||
7.4 | 0.5 | 0.3 | 0.2 | 0.1 | 1.1 | 0.0 | 72.0 | |||||
CD-260 | -49 | 059 | 113.2 | CNWE | ||||||||
1.0 | 1.0 | 0.6 | 0.1 | 0.9 | 0.1 | 0.0 | 13.3 | |||||
1.0 | 0.8 | 0.5 | 0.0 | 0.8 | 0.4 | 0.0 | 18.0 | |||||
20.1 | 0.6 | 0.4 | 0.3 | 0.2 | 1.1 | 0.0 | 34.8 | |||||
6.3 | 0.2 | 0.1 | 0.1 | 0.1 | 1.1 | 0.0 | 61.1 | |||||
10.3 | 0.1 | 0.1 | 0.0 | 0.1 | 2.8 | 1.0 | 85.6 | |||||
CD-259 | -67 | 045 | 36.0 | CabaƧal-Sth | ||||||||
Abandoned | ||||||||||||
CD-258 | -44 | 045 | 49.4 | ECZ / Gabbro | ||||||||
NSI | ||||||||||||
CD-257 | -51 | 058 | 127.2 | CNWE | ||||||||
23.8 | 0.5 | 0.3 | 0.3 | 0.1 | 0.7 | 0.0 | 11.3 | |||||
3.2 | 0.8 | 0.5 | 0.5 | 0.2 | 0.7 | 0.0 | 85.0 | |||||
6.8 | 1.7 | 1.1 | 0.7 | 0.8 | 2.6 | 0.0 | 98.1 | |||||
CD-256 | -90 | 000 | 108.2 | ECZ | ||||||||
4.5 | 0.4 | 0.3 | 0.3 | 0.0 | 0.3 | 0.0 | 16.0 | |||||
28.6 | 0.7 | 0.5 | 0.4 | 0.1 | 2.0 | 0.0 | 66.7 | |||||
Including | 4.9 | 2.3 | 1.5 | 1.2 | 0.5 | 6.2 | 0.2 | 88.5 | ||||
CD-255 | -49 | 046 | 184.1 | C4A-Sth | ||||||||
4.0 | 0.3 | 0.2 | 0.1 | 0.1 | 5.1 | 0.6 | 117.3 | |||||
Including | 0.3 | 0.1 | 0.2 | 32.4 | 5.3 | 119.9 |
About Meridian
Meridian Mining UK S is focused on:
- The development and exploration of the advanced stage CabaƧal VMS goldācopper project;
- Regional scale exploration of the CabaƧal VMS belt;
- Exploration in the JaurĆŗ & Araputanga Greenstone belts (the above all located in the State of Mato Grosso, Brazil); and
- Exploring the EspigĆ£o polymetallic project in the State of RondĆ“nia, Brazil.
CabaƧal is a gold-copper-silver rich VMS deposit with the potential to be a standalone mine within the 50km VMS belt. CabaƧal's base and precious metal-rich mineralization is hosted by volcanogenic type, massive, semi-massive, stringer, and disseminated sulphides within deformed metavolcanic-sedimentary rocks. A later-stage sub-vertical gold overprint event has emplaced high-grade gold mineralization cross-cutting the dipping VMS layers.
The CabaƧal Mineral Resource estimate consists of Indicated resources of 52.9 million tonnes at 0.6g/t gold, 0.3% copper and 1.4g/t silver and Inferred resources of 10.3 million tonnes at 0.7g/t gold, 0.2% copper & 1.1g/t silver (at a 0.3 g/t gold equivalent cut-off grade), including a higher-grade near-surface zone supporting a starter pit.
The Preliminary Economic Assessment technical report (the "PEA Technical Report") dated March 30, 2023, entitled: "CabaƧal Gold-Copper Project NI 43-101 Technical Report and Preliminary Economic Assessment, Mato Grosso, Brazil" outlines a base case after-tax NPV5 of USD 573 million and 58.4% IRR from a pre-production capital cost of USD 180 million, leading to capital repayment in 10.6 months (assuming metals price scenario of USD 1,650 per ounces of gold, USD 3.59 per pound of copper, and USD 21.35 per ounce of silver). CabaƧal has a low All-in-Sustaining-Cost of USD 671 per ounce gold equivalent for the first five years, driven by high metallurgical recovery, a low life-of-mine strip ratio of 2.1:1, and the low operating cost environment of Brazil (see press release dated March 6, 2023).
Readers are encouraged to read the PEA Technical Report in its entirety. The PEA Technical Report may be found on the Company's website at www.meridianminig.co and under the Company's profile on SEDAR at www.sedar.com.
The qualified persons for the PEA Technical Report are: Robert Raponi (P. Eng), Principal Metallurgist with Ausenco Engineering), Scott Elfen (P. E.), Global Lead Geotechnical and Civil Services with Ausenco Engineering), Simon Tear (PGeo, EurGeol), Principal Geological Consultant of H&SC, Marcelo Batelochi, (MAusIMM, CP Geo), Geological Consultant of MB Geologia Ltda, Joseph Keane (Mineral Processing Engineer; P.E), of SGS, and Guilherme Gomides Ferreira (Mine Engineer MAIG) of GE21 Consultoria Mineral.
On behalf of the Board of Directors of Meridian Mining UK S
Dr. Adrian McArthur
CEO and Director
Meridian Mining UK S
Email: [email protected]
Ph: +1 (778) 715-6410 (PST)
Technical Notes
Samples have been analysed at the accredited ALS laboratory in Lima, Peru, and SGS laboratory in Belo Horizonte. Samples at ALS are dried, crushed with 70% passing <2mm, split off to give a mass of approximately 250g, and pulverized to >85% passing 200#. Routine gold analyses have been conducted by Au-AA23 (fire assay of a 30g charge with AAS finish). High-grade samples (>10g/t Au) are repeated with a gravimetric finish (Au-GRA21). Samples with visible gold identified during logging are analysed by screen fire assay method Au-SCR21. Samples at SGS are dried, crushed with 75% passing <3 mm, split to give a mass of 250-300g, pulverized with 95% passing 150#. Gold analyses are conducted by FAA505 (fire assay of a 50g charge), and base metal analysis by methods ICP40B and ICP40B_S (four acid digest with ICP-OES finish). Visible gold intervals are sampled by metallic screen fire assay method MET150-FAASCR. Samples are held in the Company's secure facilities until dispatched and delivered by staff and commercial couriers to the laboratory. Pulps are retained for umpire testwork, and ultimately returned to the Company for storage. The Company submits a range of quality control samples, including blanks and gold and polymetallic standards supplied by Rocklabs, ITAK and OREAS, supplementing laboratory quality control procedures. In BPM sampling, gold was analysed historically by fire assay and base metals by three acid digest and ICP finish at the Nomos laboratory in Rio de Janeiro. Silver was analysed by aqua regia digest with an atomic absorption finish. True width is considered to be 80-90% of intersection width. Assay figures and intervals are rounded to 1 decimal place. Gold equivalents are calculated as: AuEq(g/t) = (Au(g/t) * %Recovery) + (1.492*(Cu% * %Recovery)) + (0.013*(Ag(g/t) * %Recovery)), where:
ā¢ Au_recovery_ppm = 5.4368ln(Au_Grade_ppm)+88.856
ā¢ Cu_recovery_pct = 2.0006ln(Cu_Grade_pct)+94.686
ā¢ Ag_recovery_ppm = 13.342ln(Ag_Grade_ppm)+71.037
Recoveries based on 2022 metallurgical testwork on core submitted to SGS Lakefield
The Mise-a-la-Masse survey is being conducted using the Company's in-house team, utilizing its GDD GRx8ā16c receiver and 5000Wā2400ā15A transmitter. Data is processed by the Company's independent consultancy Core Geophysics. Geophysical and geochemical exploration targets are preliminary in na
