The incident adds to the firm's mounting challenges, including swinging to a loss, growing debt, unplanned equipment outages and Moody’s Investors Service recent cut of the company's credit rating.
The state-owned entity says it will preserve its leading position as extractor of natural uranium, by developing existing mines, building new ones and introducing technologies to lower the costs of uranium extraction.
With the only exception of gold, production numbers for most other commodities mined in the Central African nation are also expected to decline this year.
Authorities say the $2.5 billion illicit mining industry is creating a parallel economy that is deemed to damage the business of those who operate legally.