To rummage or search in a slightly aimless manner for an item of interest/value.
"I found this neat teapot while fossicking around in that second-hand store down the road"
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To rummage around searching for something. Specifically used in mining for gold.
All he does all day is fossick, fossick, fossick through those cliffs, i hope he doesn't expect to find any gold in there, it was all extracted years ago.