See
http://www.cudeco.com.au/wp-content/uploads/2017/07/1696388.pdf
"Low tonnages of coarse native copper were produced due to a focus on processing HGF ores, when available, to maximise copper concentrate production. Coarse native copper ore was concurrently mined and stockpiled for later processing in FY 2018. "
IMO: Maybe waiting on a better processing method. Suggest run steam roller over it, then through a wood chipper.
See...
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