6When a relevant GTL operation exists

6  When a relevant GTL operation exists  (1) A relevant GTL operation exists if there is an operation (the overall operation) in which:  (a) petroleum is, or will be, recovered from a petroleum project; and  (b) sales gas is, or will be, produced from some or all of the petroleum; and  (c) some or all of the sales gas is, or will be, processed into a liquefied product.  (2) The project natural gas of the relevant GTL operation is the petroleum (in the form of natural gas) mentioned in paragraph (1)(a) from which sales gas will be produced and processed into liquefied product within the overall operation (including any of that natural gas that is used in that production and processing).  (3) The project sales gas of the relevant GTL operation is the sales gas mentioned in paragraph (1)(b) that:  (a) will be processed into liquefied product within the overall operation; or  (b) will, after becoming an excluded commodity, be used in the downstream stage of the operation in relation to the processing of sales gas mentioned in paragraph (1)(b) into liquefied product.  (4) The liquefied product mentioned in paragraph (1)(c) is project liquid of the relevant GTL operation.  (5) The project natural gas, project sales gas and project liquid are project product of the relevant GTL operation.  (6) The production year for the relevant GTL operation is:  (a) if an election has been made in relation to the relevant GTL operation under section 54—the 2012‑13 year of tax; and  (b) otherwise—the year of tax in which processing first occurred.  (7) The 31 December of the production year is the production date for the relevant GTL operation.  (8) The period beginning with the production year and ending with the year of tax in which project sales gas is last processed into project liquid is the operating life of the relevant GTL operation.  (9) If the relevant GTL operation produces a marketable petroleum commodity other than project sales gas, the year of tax in which it is first produced is the MPC production year for the relevant GTL operation. Operations where custody of the project product changes  (10) To avoid doubt, an operation may be a relevant GTL operation even if project product of the operation is not in the custody of participants in the operation for all of the phases of the operation.