Best Metal Detectors for Relic Hunting: Iron Separation Over Raw Depth

Three things: how fast it recovers between targets, how much it tells you about iron rather than hiding it, and whether you can put a small coil on it. A park machine is tuned to give you a clean number on an isolated coin in mild soil. A relic machine has to stay honest when a good target is masked by a nail lying across it.

Iron audio is the feature that earns its keep. The Garrett AT Pro publishes 40 levels of iron discrimination along with proportional audio and tone roll, which is Garrett saying plainly that the audio carries more information than the number does. The Teknetics G2+ publishes FeTone adjustable iron audio, which lets you turn iron down without turning it off, plus V-Break so you can move the tone breakpoints yourself. Turning iron off entirely is how people walk over good targets, so both of these exist for the same reason.

Mineralisation is the other half of the problem. Old ground is often hot ground, and a higher operating frequency copes better with small low-conductor targets in it. The Garrett AT Gold runs at 18 kHz with a ground balance window, and the Fisher Gold Bug Pro runs 19 kHz with a real-time mineralisation readout. Both are sold as gold machines and both are used as relic machines for exactly that reason. The frequency chart explains where the trade-off turns against you.

Read the coil column first. A machine with no small coil available is a machine that cannot work an iron-infested site, whatever else it does.

Because masking is the whole problem. A large coil generates a wide detection field, and when a nail and a button sit inside that field at the same time the machine averages them and reports iron. A smaller coil sees a smaller patch of ground, so it can resolve the two separately. That is the entire mechanism, and it is why people who hunt worked sites carry two coils.

The practical options are a genuinely small round coil or a narrow ellipse. The Minelab EQX 06 Coil (6 inch) at $225.00 is the 6 inch Double-D for the Equinox series and the X-Terra Pro, and Minelab publishes its weight at 10.68 oz with the skidplate fitted. The Nokta LG15 Coil (6 inch) at $127.99 does the same job on The Legend. The Coiltek 10 by 5 NOX Search Coil at $308.00 is the compromise: a 10 by 5 ellipse keeps a long sweep footprint while staying narrow enough to work between iron, which means you lose less coverage than a 6 inch round costs you.

You pay for this in ground covered per hour. A 6 inch coil on a big field is slow enough to be demoralising. Use the coil size selector to sanity check the choice against the site in front of you, and the coverage calculator to see what the smaller coil costs you in hours.

Roots. That is the answer. On a demolished house site or a woodland edge the resistance is not soil, it is root mat and buried rubble, and a plain trowel will not cut either. Serrated edges are what the detecting-specific tools have that garden tools do not. Lesche publishes a serrated, pre-sharpened blade on the Lesche Sampson Pro-Series T-Handle Shovel, 31 inch and a double serrated blade on the Lesche T-Handle Shovel, 36 inch double serrated, and both are built around a T-handle you can lean on.

Hand diggers still matter for the shallow targets and for anywhere you must keep the hole small. The Lesche Digging Tool and Sod Cutter with sheath at $59.95 comes with a belt sheath, which is worth having because the blade is genuinely sharp, and the CKG Double Serrated Hand Digger at $29.99 is a double serrated budget version at about half the price. Add a pinpointer and you stop enlarging holes to find something you have already located: the Minelab PRO-FIND 35 at $99.00 publishes ferrous tone ID, which on an iron site saves a dig on its own.

Whatever you carry, the hole is your reputation. Cut a plug, keep it intact, put it back and tread it down. Permission on good ground is far harder to replace than any tool on this page.