Yes, according to the Crux Interview, ADN has 600,000 tonnes of...

Yes, according to the Crux Interview, ADN has 600,000 tonnes of HRM material are at either Reserve or Resource status at Great White.
James also intimated there will be more found at GW (presumably with eventual infill drilling).
Exploration drilling at Bronze Whaler (and the joint-venture prospect) was also mentioned. Plus there is the Hammerhead (and Mt Hope) deposits.
The DFS uses a production figure of 15,000 tonnes of HRM produced, ie from about 30,000 tonnes mined (from Year 1). So ADN would already seem to have 20 years supply. However you do very much get the opinion from the interviews that HRM production could rapidly expand if they can pull off the marketing.
It does seem the new drilling is concentrating on these high-margin products now - HRM, high purity kaolin and high purity halloysite.
The newly stated regional exploration target (for all halloysite-kaolin types) is now 700 million tonnes!