Small hammered coin technique

Hear the thin target without erasing its story.

A cut halfpenny can look like silver scrap. A worn hammered coin may show only part of a cross or portrait. These targets do not always give the strong, high response people expect from silver.

Safe starting setup

Small targets need stability, not maximum power.

MODEField or small-targetBegin with the closest factory mode.
FREQMulti-frequency if stableUse the manufacturer’s general field route.
NOISENoise cancel firstFix interference before deeper controls.
GROUNDBalance noisy soilUse a clean patch for the test.
POWERHighest stable levelNot simply the highest available number.
SPEEDMedium firstRaise a little in dense iron.
IRONLight discriminationDo not block a wide low-to-mid range.
COILSmaller in tight ironBetter separation; usually less depth.

Sweep for small targets

Low, level, slow, and overlapped.

  1. 01
    Mark a permitted grid.

    Walk straight, overlapping lanes.

  2. 02
    Control coil height.

    Keep it low and level through the whole arc.

  3. 03
    Shorten the sweep.

    Test a faint repeatable spot, then turn 90°.

  4. 04
    Search the second direction.

    Iron masking changes with coil direction.

Choose the tradeoff

The “best” setting changes with the ground.

GroundUseful adjustmentWhat it costs
Mineralised soilGround balance; lower sensitivity until stableLess raw depth, clearer real targets
Dense ironSmaller coil or faster recoveryBetter separation, usually less depth
Clean open soilStandard coil and normal recoverySlower recovery may add depth but merge targets
Stubble / uneven soilSlow down; hold coil height steadyFewer lanes per hour, fewer missed tiny targets
Heavy iron filteringReduce filtering carefullyMore good targets and more convincing iron

Change one control, search a small test patch again, and decide whether the signal—not the menu—improved.

Context-safe recovery

Stop when one find becomes a site.

  1. 1
    Pinpoint before opening.

    Use only the smallest recovery method permitted on that ground.

  2. 2
    Keep coin and tools apart.

    Do not rub, scrape, bend, or flatten a thin find.

  3. 3
    Photograph before cleaning.

    Both faces, the edge, a millimetre scale, diameter, and weight all help.

  4. 4
    Stop at a cluster or container.

    Do not enlarge the hole. Protect the location and contact the official reporting body.

  5. 5
    Use the country rule.

    England, the Netherlands, and every other jurisdiction have different reporting and ownership routes.

Source ledger

Checked against the original source.

Last source review: August 28, 2026. Rules and databases can change, so open the source again before acting.