A plastic mine is where raw plastic is extracted out of the earth. Since plastic isn't mined, this is completely wrong and used to flame idiots.
"OMg i r teh l33t hax0r"
"Shut the fuck up and go back down the plastic mines where you shall eat nothing but cardboard salt."
"Send the *Insert group of people* back down the plastic mines."
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A storage container filled with many loose, unsorted LEGO pieces.
There are probably non-LEGO items as well, such as random toys and/or plastic pieces from other brands.
I ran out of gray 2x6 Plates and had to excavate the plastic mines to find more.