I'm not sure they have any real options, too bad the mines were not closer to Chad as there is a company there that is just giving away their fuel gas. This would be the most inexpensive option, but there is always government issues even within one province.
Would run a 3" pipeline, add a fuel gas kit to the generators, keep the diesel tanks as a secondary if fuel gas gets cut off from the source and your good to go.
I don't know the diesel usage or cost but the pipeline itself may pay for itself no matter what.
I'm sure solar is an option but that too has it's downsides.
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