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Boumadine (Au, Ag, Pb, Cu, Zn)

About

    A drill program is currently being conducted on the Boumadine historic mine and polymetallic deposit, which is located in the region of Drâa-Tafilalet in the Anti-Atlas mountains about 240 km from Ouarzazate in western Morocco.

 

Highlights


 

  • Ownership: Aya 85%-ONHYM 15% joint venture
  • Mining and exploration permits comprising 32 km²
  • Initial >9,100m drill program complete
    • New 2.7km mineralized trend & extension of the Central and South Zones
    • Robust, near-surface polymetallic system
    • Open at both ends along strike and at depth within 6km hydrothermal system
  • Completion of heliborne VTEM™ terrain, magnetic and radiometric geophysical surveys
    • Preliminary data suggest strong alteration system and / or intrusive beneath
  • 2022 Exploration Program
    • Drill program expanded to 13,500m
    • Mapping and prospecting ongoing
  • Previously mined as both open pit and underground between ~1950s-1992
  • Historical resource estimated in 1998 (non NI 43-101 compliant)

 

History

1400-1600

Artisanal mining of upper section

1956-1989

Exploration work by the BRPM (now ONHYM)

1988

Historical mineral resources

1989-1992

UG production: 261,485t
@3.8% Zn. 1.5% Pb,
200 g/t Ag & 3.50 g/t Au

2013

Acquisition of 85%
of Boumadine

2015

Completion of
an access road

2017

Lixiviation tests
Drone surface survey

2018

6,900m DD
program

2019

PEA &
NI 43-101

2022

Heliborne geophysical survey &
13,500m drill program

Mining Installations

The mining installations were probably dismantled shortly after the mine closed in 1992, and some are still visible at the mine site. Two dry stacked tailings, which are exposed on the site, hold some 240,000t of residues generated by underground mining of the Boumadine deposit from 1988 to 1992.
Surface and underground mine workings remain including at least 6 excavated shafts (638m) and 6,036m of underground adits, raises and stopes distributed in 5 main areas: Central Zone, Northern Zone, Southern Zone, Tizi Zone and Imariren Zone. Numerous pits and trenches are visible throughout the property ranging from a few square meters to over 1,000m² in area.


 


 

Mineralization

The main polymetallic mineralization at Boumadine extends at least for 2.7 km. The mineralized zones consist of 1m to 4m-wide N160°E-oriented lenses/veins dipping sharply (> 70°) to depths of 350 m and spatially associated with the TTF. The mineralization consists generally of 1m to 4m wide (locally reaching over 10m width) N340- oriented massive sulfide lenses/veins sharply dipping eastward (> 70°). The massive sulphide veins (>80%) are composed mainly of pyrite, with variable proportions of sphalerite, galena, and chalcopyrite. Within the massive sulphide veins, zones of breccias are present with silicified angular fragments and round fragments completely replaced by pyrite. These zones underline the presence of syn-volcanic faults used by the mineralization. Replacement of fragments by pyrite in weathered felsic tuffs locally induces large zones several tens of meters thick of sub-economical anomalous values. These wide zones are interpreted as the upper part of the hydrothermal system. The assay results show a strong correlation between the gold, silver, and copper values. A weaker correlation exists with zinc, lead and molybdenum.
The mineralization is mainly in a sequence of volcaniclastic rock composed of felsic tuff and mafic tuff. The felsic tuffs are composed of angular to rounded centimetric felsic fragments, quartz eyes, and plagioclase crystals, with locally mafic fragments. This sequence is generally homogeneous and massive and rests in unconformity on mafic tuffs. The mafic tuffs are characterized by a variable percentage of amphibole crystals and exotic fragments of sedimentary rocks, confirming their clastic origin. Those tuffs are interpreted as having a volcaniclastic origin, sedimentation in an underwater basin.
Intrusive rocks are divided into two groups: pre- to syn-mineralization and post-mineralization. Pre- to syn-mineralization dykes are mainly felsic to intermediate in composition, aphanitic to porphyritic in texture and are found as dykes or sills in both mafic and felsic tuffs, suggesting bimodal volcanism. Late intrusions are mainly rhyolitic subvolcanic domes that cut mineralization and are spatially associated with normal faults. They are interpreted as being synchronous with the post-mineralization deformation episode that segmented the mineralized zones. A swarm of regional extended mafic dykes cut each lithology on the property.
Two sequences of hydrothermal alteration are observed on the property. The first sequence mainly affects felsic tuff and manifests as phyllic alteration (Quartz-sericite-pyrite). Proximal to the veins, there is an advanced clay alteration composed of kaolinite, pyrophyllite and vuggy silica, suggesting a high-sulphidation epithermal event. The second sequence of alteration mainly affects the underlying mafic tuffs and consists of large-scale propylitization (epidote and chlorite). Near the veins, the alteration is composed of black chlorite, pyrophyllite and pyrite. The transition between these two alterations is relatively rapid and consistent with the change in composition of the tuffs and suggests chloride fluids rich in Fe, Zn and Pb, typical of VMS style mineralization.

Surface Plan with DDH Completed in 2022 on Boumadine

Exploration

The 7,500m diamond drill program scheduled in 2022 has been expanded to 13,500m to test Imariren, Tizi and SouthWest Zone targets (see left figure). In-fill drilling within the Central and South Zones will be carried in 2023 with additional step-out holes at depth and along the main trend.

The scientific and technical information contained on this page have been reviewed by David Lalonde, B. Sc, Head of Exploration, Qualified Person, for accuracy and compliance with National Instrument 43-101.

 

History

2019

Aya validates that historical mineralized panels are still in place and extends mineralization at depth -Discovers germanium 497 g/t over 1.5m in core samples -Finds gold at surface 48 g/t over 2m.

Positive NI 43-101 PEA results: Pre-tax IRR of 56% with an NPV of US$574.8 Million; And after-tax(*) IRR of 53% with an NPV of US$497.6 Million (NPV discounted at 6.5%).

Filing of technical reports on positive PEA

2018

Aya announces diamond drilling program to test historical intersections in three sectors.

Aya intersects 28m at 4.91g/t Au, 140 g/t Ag, 0.18 Cu, 0.41% Pb and 1.70% Zn at shallow depth of 153m including 6m at 11.02g/t Au, 219 g/t Ag, 0.39% Cu, 0.12% Pb and 0.55% Zn at 175m.

Metallurgy issues resolved, with 96.37% gold recovery achieved.

2017

Aya retains GoldMinds Geoservices Inc. to prepare a PEA on Boumadine by year-end 2017.

Pressure roasting and lixiviation tests conducted in China by CINF.

Topography surface survey carried out using drone

2016

Surface sampling, data compilation and initial preparations for a base camp

2015

Finalization of a US$6M loan with the European Bank for Reconstruction and Development

Realisation of an access road to the Boumadine site

2013

Acquisition of the Boumadine Polymetallic Mine
Joint venture between Maya Gold and Silver Inc (85%) and ONHYM (15%) to explore and develop Boumadine

Filing of NI 43-101 report on historical resources at Boumadine