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I found this nugget in the clark fork river in some exposed bedrock with one of my gold detectors. I always assumed it was lead, but after taking close up photographs, I'm not so sure. Any help identifying it would be appreciated.

Thank you

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Have you tried a super magnet on it? You would be looking for even the tiniest hint of magnetism.

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I'll try it right now, thank you Steve.

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That’s what I was possibly thinking too.  

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I tried the super magnet and could not notice any magnetism. Heated to a low temp and it started to precipitate tiny silvery droplets, let cool and flattened  with hammer, it became brittle and broke into 3 pieces. Heated again to melting temp cooled down and this is what I  got. Maybe platinum?  

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It's just lead. I was going to suggest essentially what you've already done, lead has a low melting point, put a match to it, a lighter, it will quickly become apparent what it is. 

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I guess my first assumption that it was lead was correct. thank you to everyone that replied !

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There are several silvery metals that melt at low temperature including lead, antimony, and tin.  That's not enough to identify it.

Unless tiny fragments are REPELLED by your super magnet, it may not be lead.  Lead, as well as similar metals, are diamagnetic, the opposite of iron.

Tiny silver droplets indicates it is an amalgam of mercury and some other metal.

Platinum does not form an amalgam and it melts at a very high temperature.

I don't know what it is.

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