how to get gold monster 1000 to see placer gold (30 mesh and smaller)

[zemetrius]

i have been finding placer gold, but its 30 mesh and smaller. I have searched the same area with my GM1000 but did not find anything that it could detect. it does not pick up anything in the area where i have been finding the placer gold, any suggestions for tweaking the GM? none of the gold in the tiny jar (safety pin for scale) was found by the GM.

 

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