Gold appears to be a lifeline for military juntas and jihadist groups in the Sahel region, analysts say.
Tuesday's attack marks the third major assault on army positions over the past month.
It is the latest violent incident since a peace deal was signed in Washington last week.
The sentence comes off the back of a souring of relations between French and Algeria.
The victims, mostly young men, were lured with promises of football contracts or other jobs abroad.
William Tolbert was killed during the 1980 coup - his body was then believed to be dumped in a mass grave.
A 19-year-old tells the BBC how she miscarried as she fled attacks in the western Darfur region.
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