California Metal Detecting Laws — Research Overview

An orientation to metal detecting and treasure hunting rules in California, covering federal land, state land, private property, and who to verify with. This page is general research information, not legal advice. The state-level summaries below are our own category-level orientation and are not sourced to a California statute, code section, or agency ruling. Rules change and differ by unit — verify with California State Parks before detecting.

Public and federal land in California [UNSOURCED SUMMARY — confirm with the managing federal unit]: Most BLM land permits recreational detecting outside designated archaeological sites. Federal land is also governed nationally by the Archaeological Resources Protection Act (ARPA) and the Antiquities Act, which prohibit disturbing archaeological resources over 100 years old without a permit.

State land in California [UNSOURCED SUMMARY — confirm with California State Parks]: California state parks prohibit metal detecting; state beaches generally allow it.

Permits, permissions, and best practices in California [UNSOURCED SUMMARY]: Recreational gold panning allowed on most public BLM ground. Mercury contamination is a real risk in old hydraulic mining areas. Always carry written landowner consent for private ground and photograph the permission document.

Terrain and productive regions in California: Sierra granite, Mojave desert, coastal range. LiDAR coverage is excellent statewide. Top areas to research include Mother Lode (Sierra foothills), Mount Diablo region, Death Valley fringes.

Documented cases relevant to legal research in California: Lost Cement Mine; Mojave gold camp caches; Mission silver caches; Gold Rush ghost-camp caches — legal status of any recovered items depends on land ownership at the moment of discovery.

Federal rules that apply in California regardless of state law: ARPA (16 U.S.C. 470aa-470mm) protects archaeological resources 100 years or older on federal and Native American land; NAGPRA (25 U.S.C. ch. 32) governs Native American remains and cultural items; and the National Park Service prohibits metal detector use in park areas under 36 C.F.R. 2.1. Treasure trove and lost-property doctrine are set by state law and are not summarized here.

Verify with the governing agency in California: California State Parks (https://www.parks.ca.gov/). Archaeological designations and permitting: the California State Historic Preservation Office, listed in the NCSHPO directory at https://ncshpo.org/. Federal land: Bureau of Land Management, National Park Service, and USDA Forest Service.