I'm planning a trip to Laramie, Wyoming this summer to visit a niece and since I'm not much for sitting around talking about family, kids, etc. I thought I might run up to the area where the Spanish Diggings quarries are. Is there any particular area where I can pick up a few pieces legally? Public land that allows collecting? I have a few small pieces of it and it's some interesting stone, enjoy working it. I have F250 4-wheel drive if needed.