The ethical situation that is being faced here is the direct sponsoring of terrorism by this company.
It is unethical in any field to sponsor killings or cause pain to people. But in this case, the mining company was initially unaware that this was going on.
They pay the warlords for their safety and the money is spent on weapons and promotion of violence.
In a situation as this and given the extent to which people may be in danger, the best thing to do is to shut this company down for a while till the unrest stops.
If not shut down, probably a relocation would be necessary. But staying in a place where violence is carried out and paying such money is far from ethical.
If they continue to pay this money, it would be assumed that they are in direct support of the activities of the warlords.
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