Can a Metal Detector Find Buried Cash, Safes or Caches?

Yes, you can use a metal detector to find buried safe boxes, lockboxes and caches, and large metal containers are generally easier to detect at depth than coins because they contain much more metal. Paper cash cannot be detected on its own, but the steel safe, ammo can, coffee can or jar lid around it can. The right tool depends on the size of the container, how deep it is likely to be and how much iron trash surrounds it. Choosing a metal detector to find a buried safe or cache is mostly about matching coil size and technology to a large, deep target.

This guide explains what makes caches detectable, which detector types suit the job, and how to plan a realistic search, including the legal questions you should answer before you dig.

What makes a cache detectable?

Metal detectors respond to metal through induced eddy currents and, for iron and steel, magnetic effects. For any given detector and ground, three things dominate whether a cache can be found:

1. Size of the metal object. Signal strength falls off steeply with distance, but a larger object starts with a much larger response. A steel safe, a metal ammo box or a large can of coins is far easier to detect deep than a single coin.
2. Material. Steel and iron give strong responses, helped by their magnetic properties. Aluminum and copper also respond well. Plastic containers, glass jars without metal lids, and PVC pipes are invisible unless they contain metal.
3. Ground conditions. Highly mineralized soil, salt and wet clay reduce depth and stability, particularly on VLF detectors.

What can and cannot be detected

Choosing a metal detector to find buried safe boxes and caches

Standard coin detectors (VLF)

A typical VLF coin detector with a stock coil is designed for small, shallow targets. It will find a cache near the surface, but it is not optimized for large objects at depth, and it may struggle in mineralized ground.

Pulse induction detectors with large coils

Pulse induction (PI) detectors handle mineralization well and, with large coils, are well suited to finding bigger objects deeper. Their limited discrimination is less of a problem when you are looking for one large target. See our PI vs VLF comparison.

Two-box and large-loop detectors

Two-box detectors separate the transmit and receive coils by a fixed distance, which makes them largely blind to small items and responsive to larger objects at greater depth. They are a traditional choice for cache and relic-cache hunting. Our article on two-box and large-loop detectors explains how they work.

Magnetometers

Magnetometers detect disturbances in the Earth's magnetic field caused by ferrous objects. They can be very effective for steel safes and iron containers, but they do not respond to non-ferrous metals such as copper, aluminum or gold. Read magnetometer vs metal detector to decide whether one fits your search.

3D ground scanners and long-range devices

Some professional systems combine a detection sensor with software that produces a visual plot of the scanned area. Manufacturers market them for caches, tunnels and voids. They can help visualize where anomalies cluster, but images require careful interpretation, and depth and size claims are manufacturer-stated. Long-range "frequency" locators are a separate category with contested claims; treat them as reconnaissance tools and confirm any indication with a conventional detector before digging. Browse options in our 3D ground scanners collection, and see our guide on deep-seeking detectors for caches.

How deep can a detector find a buried safe?

There is no fixed figure, and you should be skeptical of anyone who promises one. As a general principle, larger targets can be detected deeper than small ones, and specialized deep-seeking setups reach deeper than coin detectors. Actual depth depends on the object's size, shape and orientation, its material, how long it has been buried, the soil, the detector and coil, and the operator. Iron trash near the target can mask or confuse the signal.

A useful rule is to test before you search. Bury a container similar to the one you are looking for, at a known depth in similar ground where you have permission, and see how your equipment responds. That tells you far more about your realistic search depth than any brochure figure.

Planning a cache search: a step-by-step checklist

1. Confirm you have the right to search. Get written permission from the landowner. If the cache belonged to someone else, consider who legally owns it before you dig.
2. Gather information. If a relative buried something, ask family members about landmarks: fence lines, trees, outbuildings, wells, foundations. Caches were often placed near features the owner could find again.
3. Use maps and aerial imagery. Older aerial photographs and property maps can show buildings, paths and trees that no longer exist.
4. Define a search grid. Mark the area with flags or string lines and plan overlapping passes.
5. Do a broad sweep first. With a deep-seeking setup, cover the area quickly to identify large anomalies.
6. Investigate anomalies. Confirm each one from several directions. Large, broad, stable signals deserve attention; scattered, jumpy signals often indicate trash.
7. Call 811 before digging. Large metallic signals near buildings may be utility lines, tanks or septic components.
8. Dig safely. Deep holes can collapse. Use proper shoring or equipment for anything beyond a modest depth, and fill holes afterward.

Legal questions to answer first

Who owns a buried cache depends on state law and the circumstances, such as whether the property owner or a prior owner buried it, whether the owner can be identified, and how the courts in that state classify the find. On public land, removing objects may be restricted, and archaeological resources are protected by federal law. Never search property without permission. Our article on who owns what you find covers the general principles. For anything significant, consult a local attorney.

Rules change and vary by state. Confirm with the landowner, managing agency or legal counsel before you dig.

Searching for a family member's buried cache

A common reason people look for a buried safe is a family story: a grandparent who did not trust banks, or a relative who buried valuables before moving. Treat these searches as research projects. Write down every detail family members remember, including the type of container, the approximate year and any landmarks mentioned. Compare those details against old photographs and aerial imagery of the property. Narrowing the search to a few likely zones makes even modest equipment far more effective than sweeping an entire farm at random.

Common reasons cache searches fail

• The search area was too large or poorly defined.
• The container was not metal, or the metal had corroded away.
• Iron trash from old structures masked the target.
• The cache had already been recovered by someone else.
• Equipment designed for coins was used for a large, deep target.

Frequently asked questions

Can a metal detector find buried money?

Not paper money on its own. It can find coins and the metal container money was stored in, such as a can, ammo box or safe.

What is the best metal detector to find a buried safe?

For a large steel safe, a deep-seeking setup such as a PI detector with a large coil, a two-box detector or a magnetometer is generally more effective than a standard coin detector. The right choice depends on your soil, the likely depth and whether the container is ferrous.

Can a metal detector find a buried plastic container?

Only if it contains metal. The plastic itself gives no signal.

Will a 3D ground scanner show the shape of a safe?

Scanner software may show an anomaly, but interpreting shape, depth and size takes skill, and results vary with ground conditions. Confirm any indication with conventional detection before digging.

Is it legal to dig for a cache on someone else's land?

Only with the landowner's permission, and ownership of anything found depends on state law and any agreement you make. Get permission in writing.