Proposed Kimberley National Park data

Hi all, I am looking for spatial data of the proposed Kimberley National Park that was announced in 2015 - ​Rio Tinto to help create Australia’s largest national park - Australian Mining
I have seen pdf maps showing the proposed area, but cannot identify the dataset.
Do let me know if you have any suggestions ; I am new to WA data forum, so hope this is posted in the right place.
I am currently doing some scoping work on bauxite mining proposals and potential impacts to indigenous communities for which this dataset will be useful.
Thanks, Thomas