Free tools
Working tools for prospectors — the sort of thing we get asked about in the shop. They run in your browser, on a phone in the field or at the kitchen table.
Free to use · free to share · no sign-upThey are guides, not spec sheets. Everything they show is an estimate or a rough indication — nothing here is a measurement of a particular detector, or a claim about what any machine will do on your ground.
Gold in Rock Calculator
Two weights on a kitchen scale give you a solid estimate of the gold in a nugget or quartz specimen.
Open the tool →Where Your Coil Actually Looks
An interactive field guide to the three reasons a detector walks past gold: the shape of the cone, the lie of the nugget, and the pulse timing. Figures are indicative, not detector-specific.
Open the tool →More tools will land here over time. If there is a calculation or a bit of theory you keep having to work out in the field, tell us and we will look at building it.