Update; as I can't change the thread title!!!, the group reportedly flew to Cameroon on a private jet, but chartered a CASA-212 for the flight reported as missing.

Reported as a 'biz jet' missing for 19 hours that had departed from the Republic of Cameroon on a one hour flight.

Sundance Resources Jet Missing in West Africa | Newsolio

The Kathryn Report: Video: Private jet carrying mining executives missing in Africa