Metal detecting: permission, the law and keeping a find log

Do you need permission to go metal detecting?

Yes, in practice always. On private land you need the owner’s permission, and digging on someone else’s land without it can be trespass or criminal damage. On public land the rules come from whoever manages it: a federal agency, the state, the county or the city.

Get permission in writing and keep it with you on the hunt. Write down who gave permission, for which fields, for how long and on what conditions, for example only after harvest, holes filled, finds shown to the owner.

• Landowner or tenant name and contact details.
• The exact area, ideally with the field boundary marked.
• Dates, conditions and how finds are shared or shown.
• Any permit from a public land manager, carried with you.

What are the metal detecting laws in the US?

At federal level, the Archaeological Resources Protection Act (ARPA) protects archaeological resources on public lands and Indian lands. According to the National Park Service, it sets out prohibited activities, criminal and civil penalties for unpermitted work, and the permit requirements a federal land manager must apply before allowing archaeological investigation.

Below that level, metal detecting laws differ by state and by site: state parks, beaches, city parks and county land each have their own rules, and many require a permit or ban detecting outright. Before you go, look up the rules of the agency that manages the land, not a general list online.

What does the Treasure Act mean for detectorists in the UK?

In England and Wales the Treasure Act 1996 applies. The Portable Antiquities Scheme explains that finders are legally required to report potential Treasure within 14 days of discovery, or within 14 days of realising it may be Treasure, and that finds which meet the legal definition can be acquired by museums.

Scotland, Northern Ireland, finds at sea and on the foreshore follow different procedures. The legal definition of Treasure is set out in the Act itself, so check it there rather than relying on rules of thumb.

1. Record the exact findspot with GPS before you move on.
2. Note depth, target ID and circumstances, and take a photo.
3. Do not clean or alter the find; bag and label it separately.
4. Report it to the right body for where you found it, within the deadline that applies.

How do you search a field systematically?

Walking at random means some strips get searched three times and others never. Walk parallel lanes instead, spaced slightly narrower than your swing so the lanes overlap a little.

A worked example shows why tracking coverage matters: with a 4 ft (1.2 m) swing over 1.25 miles (2 km) you cover at most about 26,000 sq ft, roughly 0.6 acres. A 10-acre field therefore needs at least 17 such passes, before overlap and detours. Knowing what you have already covered stops you wasting time on the same ground.

• Start at a field edge and mark the end and return of each lane.
• Log trash as well as keepers with the target ID: after a few hunts you see which numbers are mostly trash on your ground.
• Always fill your holes and put the soil on a mat while you dig.

Related calculators on ToolboxDay

• Show my GPS coordinates
• Square Meters to Acres

Frequently asked questions

Sources

• U.S. National Park Service: Archaeological Resources Protection Act of 1979
• Portable Antiquities Scheme: Treasure
• legislation.gov.uk: Treasure Act 1996

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