And in the old days and even today the first farmers to get cotton or corn to market got the best prices.
I didn't know but now guess that the other mining concessions in North Baja have not gone into production yet,or,as you indicate,the port would already have mining specific conveyors and a loading berth for minerals.
I wonder if that is why the large private iron mining co Navria(spelling?)on its website had lavish plans to construct their own N. Baja port-(and even talked about a new 4 lane coastal hwy S. of Ensenada)but I haven't heard anything about a followup or execution of those plans. Navria's N Baja mining concessions are extensive and surround CWRN' concessions on more than one side.