U.S. DEPARTMENT OF THE INTERIORBUREAU OF LAND MANAGEMENT
Metal detecting is a recreational activity that people do to find coins, jewelry, and precious metals. Metal detecting is allowed on BLM lands as long as no artifacts are removed. Artifacts should be left alone and reported to the appropriate Field Office. Avoid all cultural and archeological sites. The Metal Detecting enthusiast may remove some rocks (handful) from areas such as picnic areas, campground areas, and recreational sites. The enthusiasts may remove some rocks as long as the rocks are not being removed from another mining claim. Mining claims can be researched on the LR2000 (http://www.blm.gov/lr2000). Enthusiasts are only allowed to make minimal surface disturbance (i.e. removing a couple of stones for memories).
If you have any questions regarding your activities, then please contact the appropriate Field Office for authorization.