You earn 70% of wage paid over 12months. I think you work 7 straight months and 5 months off over winter
The last 70% DEC intakes were 70% wages all year, 4 months 100% roster, 6 months 50% roster and Jan/Feb off completely. 50% pay until line checked but I believe that has now changed.
Most get offered 100% contract after first year.