QUESTION: Dredging Laws in Colorado Options

[swizz]

I'm about to purchase a 3" (6hp) highbanker/dredge .
I could really use a printable reference that describes the dredging laws here in Colorado. I don't want to take this thing where it is illegal to dredge and I'd also like to be able to prove (to BLM of Sherriff) that I'm not in violation while on-site and dredging.
Please help if you can.

[swizz]

Dan, Russ, and Gary (emails), I can't thank you guys enough.
As expected, I have a lot more homework to do and I will establish contacts and a relationship with the BLM office (and regional geologist) before I bust out the dredge. I hope they're as patient as you folk. Fortunately, I'll have all winter to square this away. I'm beginning to get the idea that it may be in my better interest to research the legalities of one or two areas (NF land spots that have been productive for me). Then.... if my planned dredging practices are deemed acceptable at these spots, I should probably stake claim and work them accordingly.
Or.... skip the homework and pay to work established claims. Or.... maybe a little of both.
In any event, I'm extremely concerned with doing this the right way and going through the proper channels no matter what it takes. Being a mountain dweller, wildlife freak, and flyfishing enthusiast, I'm also interested in doing things with as little impact on the environment as possible.