Story is pretty thin on the ground (unlike the weed) at the moment

The Brisbane TimesĀ  just says .

Two men, aged 71 and 37, have been charged with producing dangerous drugs after allegedly cultivating crops of cannabis on four large areas of the mountain.

They will appear in the Mackay Magistrates Court on Thursday.

Source: https://www.brisbanetimes.com.au/national/queensland/land-owner-unaware-of-20m-cannabis-growing-at-his-queensland-property-20190509-p51lmh.html