I am not 100% sure of the particulars but there was a push earlier in the year by ASIC. A number of companies have been caught out by this - more regulatory red tape to make things difficult for everyone. Not sure if the rule is in effect here as part of the resource is indicated. Anyway - check out the below links -
https://www.businessnews.com.au/article/Miners-hit-by-disclosure-rules
http://www.asx.com.au/regulation/compliance/asx-mining-reporting-faqs.htm
Good luck all, this one looks like a winner.