If you're an athlete looking to play your sport while still attending college, then it's important that you know how to maintain your amateur status so that you don't encounter any problems. Professional athletes are not allowed to compete at the collegiate level.
In the Season 4 finale, the prospectors make a final push in hopes of cashing in the gem shows: Dwayne prospects a century-old mining claim; the Busses close out the Thank You Lord claim; and the Dorrises invite aspiring rockhounds to their claim.
A season (usually) refers to a single year's worth of shows. Back when the majority of TV aired on the three (and later four) major broadcast networks, a year consisted of roughly 22 episodes. Occasionally a show would start in the summer, instead of as usual in the fall, and only have 13 episodes, but if it was picked up to go further, it would get the standard 22.