EXCLUSIVE MINING. RIGHTS The State will not during the continuance of this Agreement register any claim or grant any lease or other mining tenement under the Mining Act or otherwise whereby any person other than the Joint Venturers might under the laws relating to mining or otherwise obtain any rights to mine or take natural substances (other than petroleum as defined by the Petroleum Act 1967) from within the mineral lease unless the Minister reasonably determines that the registration or grant is not likely unduly to prejudice or interfere with the Joint Venturers’ operations hereunder.