For de-listing (Removal from the official list of the ASX), refer to the Bidder's Statement page 6 (near the bottom), and sections 8.3 and 8.4 on page 52.
Section 8.4 gives them the option to change their mind and seek to de-list BRM if they have 75%.
In any case, they can only de-list if there are less than 500 other shareholders with shares @ $2,000 or more which might prove difficult for them (I hope!).
Refer to page 13 in http://www.asx.com.au/documents/professionals/international_resources_listings.pdf
BRM Price at posting:
$2.11 Sentiment: Hold Disclosure: Held