Coal baron seeks disqualification of ICAC Commissioner David Ipp ICAC Commissioner David Ipp quietly briefed senior NSW government figures on options to clamp down on allegedly tainted Hunter Valley coal leases before Premier Barry O'Farrell requested advice "apparently out of the blue" in January, a court has heard. White Energy mining baron Travers Duncan, who is invested in the controversial Mount Penny coal exploration lease, is seeking to disqualify Mr Ipp from conducting further investigations on the basis that a fair-minded observer would suspect his "undisclosed dealings" with the government would amount to bias.