Someone who "mines" the good stuff out of the gorp on outdoor trips, leaving nothing but peanuts and raisins. In context, the term "miner" is also used as they are usually eating gorp when their behavior is noticed. Gorp stands for Good Old Raisins and Peanuts. Crap is a more modern term as it stands for Candy, Raisins And Peanuts, though this term is less well know.
"Don't be a gorp miner and just grab a handful, you hoser!