Highlights

  • Endeavour Mining has suspended underground mining at its Mana gold mine in Burkina Faso after an access ramp partially subsided.
  • The company reported no injuries and said it remains on track for its full-year group production and cost guidance.
  • Perenti (ASX:PRN) holds the underground mining services contract at the Mana complex through its West African business.

A ground stability event at a major West African gold mine has drawn attention from the Australian mining services sector and from followers of ASX-listed Gold Stocks with exposure to the region. Endeavour Mining, which is listed in London and Toronto, has suspended underground mining at its Mana mine in Burkina Faso after the access ramp leading to the depleted Wona open pit partially subsided. The incident restricted access to the Dangouna and Aviera underground portals, and the company has paused activity at all active underground portals while it assesses the ground conditions. The development is relevant for Australian readers because Perenti Limited (ASX:PRN) provides underground mining services at the Mana complex under a long-term contract with an Endeavour subsidiary.

What happened at Mana

Endeavour said the access ramp leading to the Wona open pit partially subsided late last month. The company stated that nobody was harmed during the incident. Emergency protocols were activated immediately, including the evacuation of all underground workers and notification of local authorities in Burkina Faso.

Following the incident, mining was suspended at all active underground portals at Mana while detailed geotechnical analysis is carried out and Options for remediating the ramp are assessed. The subsidence affected access to the Dangouna and Aviera portals, which are among the underground entry points serving the operation.

Endeavour's response and guidance

Endeavour is evaluating ways to offset the effect on production at Mana. These include restarting and accelerating mining through the Wona portal, which remains accessible, as well as increasing output from other near-mine open pits.

Despite the suspension, the company said it remains on track to meet its group production and All-In Sustaining Cost guidance for the full year. Endeavour has said it will provide an update on the geotechnical analysis and further details of the remediation plan alongside its September quarter results later this month. Until then, the duration of the suspension and the scope of any remediation work remain uncertain.

Endeavour's West African portfolio

Endeavour describes itself as a senior gold producer and the largest in West Africa, with operations in Senegal, Côte d'Ivoire and Burkina Faso. The company is listed on the London Stock Exchange and the Toronto Stock Exchange and also trades over the counter in the United States.

Operating across multiple mines provides Endeavour with some flexibility to absorb disruptions at individual sites, which is reflected in its decision to maintain group guidance. However, Mana's underground operations are an important part of its Burkina Faso production base, and the outcome of the geotechnical review will determine how quickly underground mining can resume.

Perenti (ASX:PRN) and its Mana contract

Perenti, an ASX-listed mining services company, announced a major underground mining contract at the Mana complex with SEMAFO Burkina Faso, a Subsidiary of Endeavour Mining, covering the Siou and Wona underground operations. The contract, which commenced in June of the previous year, includes underground development, production and related mining services, and is delivered through a joint venture between Perenti's Barminco Business and a local Burkinabe partner.

Perenti's African underground mining business has provided services at Mana for several years. Endeavour's announcement did not refer to its contractors, and no statement from Perenti regarding the subsidence had been located at the time of writing. Any effect on Perenti's activities at the site will depend on the duration of the suspension and the remediation plan that Endeavour adopts.

Ground conditions as an operational risk

Ground stability is a recognised operational risk in both open pit and underground mining, particularly where underground workings sit beneath or near depleted pits. Events of this kind can lead to temporary suspensions while engineers assess conditions, and remediation can involve redesigning access routes or reinforcing affected areas. The safety of workers is typically the priority in such assessments, as reflected in Endeavour's evacuation response. The time required to complete such reviews varies widely, depending on the extent of the affected ground, the engineering solutions available and the approvals required before work can safely restart.

Final Word: awaiting the geotechnical update

Endeavour's suspension of underground mining at Mana follows a partial ramp subsidence that caused no injuries but has restricted access to key portals. The company has maintained its full-year guidance and is assessing alternative ore sources while geotechnical work proceeds. For the Australian market, the event is relevant through Perenti's underground services contract at the site, although its implications remain unclear until Endeavour outlines its remediation plan. The forthcoming update is expected to provide greater clarity on the path forward.