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The 17" Xcoil Concentric Coil And Some Ad Hoc Comparisons To Axiom And GPX 6000


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Nugget halo makes sense to me. You'd expect iron-containing heavy minerals (ground noise) to settle in along with nuggets. It's not that the gold itself is interacting with its environment, but that the process that guides nuggets to their resting place also accumulates materials that give a bit of a signal. 

When digging, you break up the previously concentrated and defined volumes of metalliferous material which surrounded the gold. 

I'd be confused if a nugget in its "original" spot *didn't* sound different than the same nugget buried at the same depth, with same orientation, in the same now-disturbed ground.

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32 minutes ago, BrokeInBendigo said:

Nugget halo makes sense to me. You'd expect iron-containing heavy minerals (ground noise) to settle in along with nuggets. It's not that the gold itself is interacting with its environment, but that the process that guides nuggets to their resting place also accumulates materials that give a bit of a signal. 

When digging, you break up the previously concentrated and defined volumes of metalliferous material which surrounded the gold. 

I'd be confused if a nugget in its "original" spot *didn't* sound different than the same nugget buried at the same depth, with same orientation, in the same now-disturbed ground.

If it were a pure gold nugget I would expect it not to contribute to the halo, however the precipitates of iron, copper and other metals that were present with the gold in a buried nugget could leach out into the surrounding soil and create a larger halo target around the nugget.

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1 minute ago, GotAU? said:

If it were a pure gold nugget Inwould expect it not to contribute to the halo, however the precipitates of iron, copper and other metals that were present with the gold in a buried nugget could leach out into the surrounding soil and create a larger halo target around the nugget.

Maybe a tiny amount of material would leach out but only the outermost molecules in the nugget would be exposed to the environment.

I'm more referring to the depositional environment - the bedrock or clay or whatever acts just like a sluice to catch gold particles. It also catches heavy materials like iron-rich minerals. Those other materials are concentrated along with the gold contribute to the response. When you dig, you disperse all the other stuff and the response is no longer the both gold + nearby concentrated minerals, it's mostly just the gold, hence a lesser response.

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