This is a list of areas open to the public where you can search for valuable minerals in the United States and elsewhere. Many of these locations are free of charge. Others are private mines that charge a fee and yet others are club sites that require club membership. The locations listed are places where you mine the material at the source yourself. If the material is stockpiled or otherwise collected for you the site will be listed on the Parks, Tours, & Other Attractions page.
Some states have very little information other than general rules and vague hints about where you might prospect. Links are provided to that information to at least get you started. Be cautious working in these states until you have more specific information.
Please note rules regarding motorized mining, especially suction dredging, are changing rapidly in the United States. Always contact the local land agency in advance to be sure new restrictions have not been put in place recently. Motorized mining of any sort will usually require permits of some sort that may or may not be mentioned in the links below.