Mwanyu, having spent a few years traveling throughout Africa I have come to learn a few things. Yes, there is a lot of gold throughout Africa and it is being found by a whole new generation of folks with metal detectors - I believe I read somewhere that Africa is Minelabs fastest growing market. I have also found that the African governments are very interested in the gold trade and they most definitely interested in the trade of “other site finds”. Also, I think that unless you have a way for your buyers to independently test your gold on their own that you will find it challengingly to find TNet buyers. I assume that you likely are not going to ship the gold to potential TNet buyers to do their own testing prior to them sending you the purchase price - I am going to go out on a limb and say there likely are not of TNet readers rolling through Tanzania on a regular basis - though I could be wrong.
Good luck with your hunts. Walt