Here are the characters from the Jungle gold show - I don't think any of these guys are from that picture on Tony Beet's Twitter account. I do believe that the guy on the left is Joel, but not sure who the other two guys are. The t-shirts are the same, must be some connection.
Did you have a particular reason you thought there was a connection between Joel and the African gold show? Ironically, those guys (and the Discovery production crew) had to flee the country due to a lack of mining permits.