An owner of a controlled mine or a controlled works shall pay interest to the commissioner, at the standard interest rate determined in terms of section 26 (1) of the Exchequer Act, 1975 (Act No. 66 of 1975), on any amount due to the commissioner under the provisions of section 62 or 63 which was not paid on the day on which it became payable, and such interest shall be calculated from the said day to the day preceding the day on which the amount in question is paid.

[Section 64 substituted by section 21 of the Occupational Diseases in Mines and Works Amendment Act, No. 208 of 1993]