Here is what is involved with getting a license to ship gold from ghana.
Two situations. There is no fixed price for the license, but it can average between 6 and 10% of the value of the gold. You get a license from the bank for personal assets held on account.
Second situation is if you get alicense from the only company allowed to ship gold from Ghana for resale to the public. I have no idea what they charge to license you as an agent of the company. http://www.pmmcghana.com/
Something is wrong with your scenario. It sounds like a familiar scam regarding gold inheritance form Ghana.
In the scam, a person claims to be transporting gold (an inheritance) to the U.S., or other country, but along the way, they get detained. THEN the victim is asked to send the person who is transporting the gold, sufficient cash to purchase a an import or transport license, or customs taxes, or inheritance tax, and sometimes travel money because customes requires it etc.
All of these requests for money are scams ran out of Ghana, Nigeria, and other African countries. Perhaps you have knowledge of the legitimacy of this activity, but it sounds scammy to me.