Gj,
TGS has stockplied copper ores as well. They have a total of 5.8mt at an average grade of 2.7%, for 157.3kt of copper worth $1.045b as at 31st March. I know this because they report it to shareholders.
There are 5 different stockpiles of varying grade, but they don't seem to have difficulty in keeping investors informed.
CDU have a stockpile approaching 1mt of something.