[1] Geologically the sedimentary rocks of the Pupunahue Beds containing coal lie in Pupunahue Basin, a sub-basin of the larger Pupunahue-Mulpún Neogene Carboniferous Basin.
[1][2] The coals of Pupunahue deposited during the Oligo-Miocene[A] in an environment with moderate marine influence and certainly less marine influence than for the nearby Catamutún coals.
[2] In 2016 it was announced that the closed Pupunahue mine would become a national heritage site.
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