There is Dennis ONiels property in the same general area - At the intersection of Highway 24 and 82 (south of Leadville and north of Buena Vista). It's a pay to dig site. It extends into the Arkansas. Dennis moves a lot of overburden to get to better material, so if you see a large pile of dirt/rocks in the middle of a level area, while you are welcome to dig in it to see what you find, odds are good it was left there because it had little gold in it (I speak from experience).
Cache Creek is not far from here (a bit south). While on Dennis's property you can use powered equipment (Dredge or Highbanker), on Cache Creek you can't use any motorized gear at all. Dennis's property is very easy access (parking is on highway 24), where the last half mile of the road Cache Creek really requires a 4WD (or at least a pickup truck with high ground clearance), especially if it has rained recently. I go to Dennis's property a few times a year.
Either of these areas allow pans and Sluices (non powered).
ATVs are highly restricted to off road use - if you want yours confiscated, just drive it on a designated roadway (including most 4WD trails).
Picture is from Dennis ONiels property (you can see my White Van parked off of highway 24 - to give you an idea of access). This will also give you an idea of what the material you would be digging in looks like (the digging at Cache Creek is very similar - lots of rocks. My wife is handicapped and this is an easy trip for her.