Coin shooting in parks: finding old coins with a metal detector
The usual advice says coin shooting is mostly a settings trick: turn discrimination up, notch out foil and pull-tabs, and let the machine hand you coins. That is half true, and the other half costs finds. Every range you silence is a range you cannot hear — and some of what lives in those ranges is worth digging. Coin shooting in a park is not a setting. It is a decision you remake in each part of the park: hard filtering where modern trash is thick, patient digging where the ground is old and undisturbed.
What coin shooting actually is
Coin shooting means configuring a detector specifically to hunt coins rather than relics or jewellery: discrimination filters iron and trash while you target higher-conductivity objects, and you judge each signal by tone and target ID before deciding to dig. Done well, it trades a little breadth for a lot of speed — fewer junk holes, more time over ground that holds coins. Done carelessly, it becomes a machine for ignoring exactly the signals an older park still has left.
Set the machine for coins — and know what the setting costs
Start with the detector's Coins preset, then refine with notch discrimination to remove specific conductivity windows while preserving coin ranges. That is the sensible baseline, and in a modern tot lot or a trashy picnic shelter it is the right one.
Know the price, though. Overusing discrimination can block valuable finds that share conductivity ranges with common trash — gold is the standard example — and excessive notching can cut gaps into the detection spectrum where a real target simply never sounds. The practical rule is zonal: the newer and trashier the ground, the harder you may filter; the older and quieter the ground, the more of those borderline signals deserve a look. A faint, repeatable signal in an old section is information. The same signal under a modern concession stand is usually a pull-tab with good PR.
Read the number, then cross-check it
On the scale used in one widely read club guide, silver coins typically register VDI numbers between 85 and 92, with iron low on the conductivity spectrum and coins, silver, and gold higher. Treat any such chart as a dialect, not a language: scales differ between machines, so the durable skill is building a personal reference. Bury known coins at varied depths in a test garden, note how each one reads and sounds on your machine, and that notebook page is worth more than any printed chart.
Two field checks then do the real work. First, listen to the tone alongside the number — the number alone is a rumour. Second, cross-sweep: pass over the target from a perpendicular direction and compare. A flat-lying coin produces a reliable, consistent signal; an edge-standing coin generates erratic readings, which is a reason to dig, not to walk away. A target that reads coin-like from two directions has earned its hole.
Where park coins actually sit
The most productive park ground shares three traits: decades of consistent foot traffic, minimal ground disturbance from renovations, and soil you can actually work. Rank the zones accordingly:
| Zone | Why coins gather there | How to hunt it |
|---|---|---|
| Bleachers and concession stands | Spectators congregate and handle money | Filter harder — modern trash is thickest here |
| Playground perimeters and woodchip | Constant small losses, easy surface recovery | Moderate filtering; shallow targets can often be probed, not dug |
| Picnic areas and old shade trees | Long, relaxed gatherings over many years | Dig more borderline signals; this is older-loss ground |
| Park perimeter and field boundaries | Walked for decades, and where many hunters give up early | Slow down; perimeter ground is the least exhausted |
Old ground beats busy ground
Assume the park has already been detected — there are few, if any, totally untouched parks left. What remains is usually not in the obvious centre but in the ground nobody renovated: original dirt under old trees, the perimeter strip, the corner the landscaping never reached. Renovation fill can bury old coins beyond reach or replace the old surface entirely, which is why decades of traffic only count when the ground was left alone.
Two habits follow. Arrive with several spots identified — check street-level and old aerial imagery beforehand — so a sports game on your first-choice field moves you to plan B instead of ending the hunt. And investigate disturbed ground whenever you find it: rain wash, flooding, burrowing animals, and maintenance work all move soil, and moved soil can bring older coins back within reach of the coil.
Recover like the park is borrowed
It is. Permission in parks varies dramatically between jurisdictions — some require permits, some prohibit detecting entirely — so check the local rules for the specific park before the hunt, and treat protected archaeological and heritage areas as closed. Recovery technique is what keeps the remaining parks open: probe shallow targets before excavating anything, cut a half-circle or V-shaped flap for deeper ones, lift it cleanly, and replace it precisely so the turf reads as untouched. Finally, do not clean what you find. Leave the patina intact, and log the target ID number, depth, and recovery details while they are fresh — that log is how a park teaches you its own dialect.
A park coin session, step by step
- Check the rules for this park. Confirm detecting is allowed here, whether a permit is required, and which areas are off-limits.
- Scout before you swing. Walk the zones in the table, note which ground looks original and which looks renovated, and pick an order: oldest undisturbed ground first.
- Set the baseline. Coins preset, moderate discrimination, notch only the junk windows you have verified against your test-garden notes.
- Sweep in smooth, overlapping arcs. Keep 3–4 foot arcs parallel to the ground and advance every 2–3 swings so coverage is systematic, not hopeful.
- Cross-check every keeper. Perpendicular pass, tone plus number, both directions coin-like before the digger comes out.
- Recover and restore. Probe or flap, retrieve, replace the plug precisely, and re-scan the hole.
- Loosen the filter in the old section. When you reach undisturbed ground, drop the notches back and dig the repeatable borderline signals the trash zones taught you to skip.
What success looks like: a finds pouch with more coins than junk, a log entry for each keeper with its number and depth, and turf that shows no sign of the session an hour later.
— Tom Reilly, Home & DIY Writer