210 EXHIBIT 10.15 PETROLEUM PROSPECTING PERMIT 38706 LICENCE ENDORSEMENT Licence PPL 38706 Action In terms of section 10 of the Petroleum Act 1937, the Acting Secretary of Commerce, acting under delegated authority of the Minister of Energy of 3 May 1991 has agreed to amend the Second Schedule work programme. Date 12 September 1996 Details The Acting Secretary of Commerce has agreed to amend the Second Schedule work programme whereby the attached work programme is adopted for the remainder of the term of the licence. Certified true and correct /s/ W. P. Player W.P. Player for Unit Manager-Permitting 16/09/96 LICENCE ENDORSEMENT Licence PPL 38706 Action Minora Energy (New Zealand) Limited changed its name to Ngatoro Energy Limited Date 07 January 1997 Certified true and correct /s/ W.P. Player W.P. Player for Unit Manager - Permitting 10/01/97 LICENCE ENDORSEMENT Licence: 38706 Action: 1. In terms of section 18(2) of the Petroleum Act 1937, the terms specified in Clause 3 of the second schedule work programme for Petroleum Prospecting Licence (PPL) 38706 are hereby amended; and, a new Third Schedule to define the royalty provisions applicable to the licence is hereby attached to the licence. 211 2. In terms of section 23 of the Petroleum Act 1937, the assignment of an 11 percent in the licence by the Minister of Energy to the remaining licensees is hereby approved. Details: A revised Second Schedule is attached. A new Third Schedule is attached. The participating interests in this licence area are now as follows: percent Fletcher Challenge Energy Taranaki Limited 29.784650 Southern Petroleum (Ohanga) Limited 29.784650 Petroleum Resources Ltd 20.430070 Australia and New Zealand Petroleum Ltd 15.000000 Minora Energy (New Zealand) Ltd 5.000000 DATED at Wellington this 23rd day of December 1996. /s/ Max Bradford SIGNED by Hon MAX BRADFORD, Minister of Energy