Thanks to this: http://www.asx.com.au/asxpdf/20131107/pdf/42kq3q3hz9vct7.pdf MBE could raise the equivalent of 25% of their existing market cap.
ASX Listing rules with respect to cap raisings: http://www.jacmac.com.au/uploaded/News/publications/201208_New_Capital_Raising_Rules_for_ASX_Listed_Companies.pdf