Roadrunner - Yes I thinking classifying and taking home counts as concentrates. At least in my book because that is what I do on my claims.
All this on motorized vs mechanized, it would be motorized, anything with a motor electric or gas, anywhere in the Black Hills. And yes it is all the Black Hills that are in South Dakota because it is a state permit, not a law. You can have the law but the state gets around that by having you get a permit. Think of it as registering your car, if you do not do it you get fined. They want to know where you are going to dig up the land so they know you will go back in and perform some reclamation when you are done. That is why they want a bond in case you do not. Been like this ever since the big hard rock mines polluted up the creeks with cyanide. (which are mostly clean now)
BH - I am a summer resident and an east river resident in the winter. Do you have a webpage that shows the times for the meetings, I will have to register this summer. Looking forward to a chapter in the BH that might concentrate more on the one/two man small mining and less on dinking around. I really miss having a group dig, in the BH with limited equipment and small gold I personally think this is the way to go.