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Nigeria

Segilola Mine

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Overview

Mine TypeOpen Pit
StatusActive
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life... Lock
SnapshotSegilola mine is a conventional open cut operation.

In 2023 the Segilola processing plant upgrade was completed and completion of the pushback of the west wall of the Segilola pit.

In 2024, the Thor’s strategy will be focussed on growth. The first priority is to extend the Segilola Mine life where there is currently an underground resource of over 100,000 ounces that has not been incorporated into the existing mine plan. At the current prevailing high gold prices, Thor aim to assess our options in re-optimising the Segilola Pit to produce gold from this resource prior to transitioning into an underground mine. Thor Explorations also aim to carry out further exploration at depth aimed at increasing the existing underground resource which has not been closed out.

Owners

SourceSource
CompanyInterestOwnership
Segilola Resources Operating Ltd. (operator) 100 % Direct
Thor Explorations Ltd. 100 % Indirect
Segilola Gold mine is wholly owned by Segilola Resources Operating Ltd, a subsidiary of Thor Explorations Ltd.

Contractors

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Deposit type

  • Vein / narrow vein
  • Orogenic

Summary:

Segilola is an orogenic-style lode gold deposit which occurs within a regional-scale shear zone.

Host rocks comprise an overturned sequence of high-grade amphibolite-facies metasediments intruded by a large, possibly differentiated, granodiorite sill-like body. The mineralisation is developed within a series of steeply dipping, tabular, very continuous, late stage quartz-pegmatite veins that do no exhibit any form of significant deformation such as folding or faulting. The geological and mineralogical characteristics of the mineralised veins are consistent throughout both the strike and down dip extents of the known resource.

Drilling results demonstrate that gold mineralization occurs in fractured pale to dark grey coloured smoky quartz veining, sheared pegmatite, and silica/chlorite/carbonate alteration. The mineralization is hosted in three steeply dipping vein sets or lodes; the Hanging Wall Lodes (Lodes 100 and 300, and minor lodes 400, 500 and 600) and the Footwall Lode (Lode 200). Together these form an elongate mineralized zone striking 010° and dipping 60° to 70° towards the west within a developed shear zone, primarily in biotite gneiss. The currently drilled mineralized zone is approximately 2,000 m in strike length, between 70 m and 200 m in depth, and between 2 m and 18 m in true thickness.

The mineralogy of the Segilola deposit is characterised by its general simplicity and consistency. The gold is entirely non-refractory and commonly occurs as visible particles within either pegmatitic quartz-feldspar veins or foliated biotitic selvedges to the veins. There are no significant trace element associations such as silver with gold. However, metallurgical assaying indicates slightly elevated copper (250 ppm to 300 ppm) and mineralogical studies suggest a gold-tellurium association.

Two styles of gold mineralisation are observed:

• Narrow, 1 m to 3 m thick Hanging Wall Lodes within silicified biotite schists (DGS). These lodes locally contain 5 µm to 20 µm grains of visible gold and are developed in the hanging wall to the main (footwall) lode. These lodes appear to have different controls to the footwall lode and have a more vertical continuity over shorter strike lengths.

• Wide, up to 15 m, ‘footwall’ mineralisation within a characteristically grey-green, strongly silicified zone of biotite schists and gneisses (SZQ1).

The mineralised lodes generally comprise highly silicified fine-grained, foliated biotite gneiss typically intruded by both discordant and concordant pegmatitic quartz-feldspar veins.

Shearing, fracturing, and alteration influence the location of gold mineralisation. This relationship has generated multiple zones of gold mineralisation hosted by shears now represented by chlorite and calcite alteration, together with quartz veining and pyrite development.

Minor sulphides, typically pyrite, are associated with the lodes. Macroscopic observations show that sulphide grains and blebs are often aligned with foliation, commonly following either biotite-rich laminae or near pegmatite boundaries. There is also, however, a common generation of pyrite occurring along fractures or as quartz-pyrite tension gashes, highly discordant to the foliation. A cursory examination suggests most of these do not contain pyrrhotite. These either relate to a late episode of mineralisation, or to remobilisation of sulphides.

Native gold is visible in both altered wall rock and in quartz-feldspar veins. It occurs with petzite (a silver-gold telluride), within pyrite, and quartz veins. The typical size of native gold blebs is approximately 10 µm. Gold, either as native grains, flakes and blebs occurs together with gold-on-pyrite in alteration zones, along tension gashes, hair-like fractures, joints, and minor faults.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

The Segilola Gold Mine achieved first gold production at the end of Q4 2021.
CommodityProductUnits2024202320222021
Gold Metal in doré oz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe
Gold Payable metal oz
^ Guidance / Forecast.

Operational metrics

Metrics202320222021
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Production Costs

CommodityUnits202420232022
Total cash costs (sold) Gold USD  ....  Subscribe  ....  Subscribe
All-in sustaining costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe
^ Guidance / Forecast.
** Net of By-Product.

Financials

Units202320222021
Sustaining costs M USD  ....  Subscribe  ....  Subscribe
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Required Heavy Mobile Equipment

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Personnel

Mine Management

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Total WorkforceYear
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Aerial view:

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