I think it's probably a much better plant to extract a good deal of wealth from the natural resource and invest it in other areas of higher value creation, even in the same vertical.
There's a good chance that Ghana's policies are needlessly constrained.
More obviously there are 100 things Ghana could do to improve living conditions in more obvious areas i.e. corruption etc..
Consider the immediate situation:
Ghana's exporters have just been banned from exporting. They are going to go out of business very soon.
Ghana doesn't have all of the layers of industry necessary to support development and export of products i.e. there are no market buyers at any reasonable price.
Result: collapse of the industry - unless somehow the Government of Ghana can artificially inflate prices and keep them alive for a very long time while domestic partners somehow magically are able to get off their feet.
This plan feels not very well conceived.
I'll bet something is lurking under the surface.