(1) The Minister may delegate the performance of any of the Minister's functions or powers under this Act, other than this power of delegation, to the chief executive officer of the department.

(2) A delegation of a function or power to the chief executive officer of the department may authorize the chief executive officer to subdelegate the function or power to any other officer of the department in accordance with any conditions specified in the delegation.

(3) A function performed, or a power exercised, by a delegate or subdelegate is to be taken to be performed or exercised by the Minister.

(4) A delegate or subdelegate performing a function or exercising a power under this section is to be taken to do so in accordance with the terms of the delegation or subdelegation unless the contrary is shown.

(5) Sections 58 and 59 of the Interpretation Act 1984 apply to a subdelegation under subsection (2) as though it were a delegation.

(6) A delegation or subdelegation must be in writing.