I hate to say it but by the time you cover the costs of any machinery you buy and the mercury or chemicals you use, from what I can see in the pan after 3 pans full you say. I think you will be overcapitalized for a small return.
Best bet might be to send a bit of random ore from the bin away for assay to see if the returns are worth the outlay.
Best bet might be to send a bit of random ore from the bin away for assay to see if the returns are worth the outlay.