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Mako, Tomboronkoto |
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Senegal |
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Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Mako Gold Mine is situated in far southeastern Senegal, ~100 km west of the border with Mali and 50 km north of the border with Guinea, and is ~140 km SSW of the Sadiola Gold Mine in Mali. The Tomboronkoto satellite mine is located ~17.5 km SE of the Mako mine, and ~31 km by road.
(#Location: Mako - 12° 50' 56"N, 12° 25' 54"W).
It lies within the Kenieba Window, which exposes rocks of the host Birimian sequence, that also host the Sadiola gold deposit. Gold mineralisation is within a felsic unit that is sandwiched between two sheets of basalt, and occurs as disseminated and veinlet pyrite, quartz-carbonate-chlorite alteration and veining. This mineralisation and alteration is surrounded by zones of bleaching and hydrothermal brecciation that occur within both the Felsic Unit and part of the Lower Basalt Unit.
The mineralised zone has a strike length of at least 1.7 km and width of 30 to 60 m that dips at 20 to 30°NW near surface, steepening to ~45° at depth. True widths vary from 5 to 40 m, and mineralisation remains open at depth (as of 2024) although deep drill holes have identified higher grade shoots beneath the base of the open pit amenable to underground extraction.
Mineralisation is controlled by a northeast striking structure, with deposition influenced by the chemistry and rheology of the felsic volcanic horizon acting as a favourable horizon for silicification and the deposition of the gold-pyrite mineral assemblage. The intensity of gold mineralisation appears to correlate with the intensity of pyrite development and exhibits good lateral and vertical continuity throughout the mineralised zone.
Mineralisation at Tomboronkoto has a similar width, but dips at ~70°SSE. It is interpreted to be hosted within a shear cutting a granodiorite. The intensity of gold mineralisation appears to correlate with the intensity of pyrite development and exhibits good lateral and vertical continuity throughout the mineralised zone.
Mineral Resources as at 31 December, 2023 at a 0.5 g/t Au cutoff (Resolute Mining Ore Reserve and Mineral Resources Statement, 2023):
Measures Resource - 4.608 Mt @ 1.1 g/t Au;
Indicated Resource - 6.234 Mt @ 1.8 g/t Au;
Inferred Resource - 10.668 Mt @ 1.8 g/t Au;
TOTAL Resource - 21.510 Mt @ 1.4 g/t Au for 29 tonnes of contained gold.
Of these resources, 7.206 Mt @ 1.7 g/t Au are in situ at Mako, and 4.100 Mt @ 1.0 g/t Au are in stockpiles, whilst 10.204 Mt @ 1.2 g/t Au are within the Inferred Resources at the Tomboronkoto satellite mine.
NOTE: Mineral Resources are inclusive of Ore Reserves.
Ore Reserves as at 31 December, 2023 at a 0.9g/t Au cut-off (Resolute Mining Ore Reserve and Mineral Resources Statement, 2023):
Proved Reserve - 4.445 Mt @ 1.1 g/t Au (includes 4.1 Mt @ 1 g/t Au at Tomboronkoto);
Probable Reserve - 3.652 Mt @ 2.1 g/t Au;
TOTAL Reserve - 8.097 Mt @ 1.5 g/t Au.
The bulk of the information in this summary is drawn from https://miningdataonline.com.
The most recent source geological information used to prepare this decription was dated: 2023.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
Mako
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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