Just saying, you will not have claim owner permission to go on THEIR claim with equipment to test. There is the matter of disturbance to consider. So, you find a supposedly good claim to buy and want to test it. This claim has good gold at the creek or river, and it's 1,000 feet in the canyon. In order to test it with heavy equipment, it will require putting in a road and a pad for that equipment. Any disturbance over 5 acres requires a POO, and a reclamation bond. The claim for sale is, lets say $5000. The salesman claims it will produce an ounce per yard. Are you willing to put in a road, and pad costing $50,000 just to find out if he's telling the truth? Add in that just to test you'll be required to file a Plan of Operation and post a reclamation bond. Now you have to wait for approval, likely a year, and the more you "BUCK UP" to the Government, the longer they take. And the bond goes up. So now you're into the $100,000's just to test a $5,000 claim.
So, BUCK UP AND BE A FREEBORN MAN. Just remember, if you want to get a million in gold, you better have three million in cash first.