Portugal’s Galp Energia has begun receiving offers for its massive Mopane oil discovery off Namibia’s coast, signaling that one of Africa’s most promising new hydrocarbon frontiers could be edging closer to commercial production. The company told investors earlier this month it’s in advanced talks with potential buyers and expects to announce a sale later this year. Galp controls an 80% stake in Mopane and, according to Bloomberg, is preparing for a development that could involve two floating production storage and offloading…