As a Colorado prospector I want you to be cautious here. A big chunk of clear creek in Clear Creek County is upstream of the gold deposits and is barren. Some other parts have been moved/relocated to allow the road to come thru and may be the gold is mostly under the road now. As said above, only buy what you have tested yourself! Also know that just downstream in Jefferson county, big chunks of the creek are open to prospecting, including 4"dredges(!) and are not claimable due to being owned by the county. You don't need a claim to have fun and get gold in Clear Creek! Edit: also further downstream (just below the Coors Brewery) there is a public gold prospecting park...all are welcome, no fees either. There are rules, mostly obvious stuff although they do not allow engines (battery powered motors are ok tho).