People v. Alvin & Bill

You are a judge and must reach a decision in the following case: (Because there are only 2 answers, guilty or not guilty, its ok to duplicate someone elses decision. Just make sure you fully explain your reasoning.)
Alvin, Bill and Charley are partners and prospectors in a diamond mine in Strayer State. They fear tresspassers might steal diamonds from the mine when they are away, so they keep the location of their mine a closely guarded secret. …