Debt funding is a high risk approach, like forward selling....

Debt funding is a high risk approach, like forward selling. Better to raise a big chunk and have breathing room if all doesn't go to plan. It may also be better not to rush into production late in the year as the wet season starts, and wait a few months reducing risk related to weather.
Also be worth considering doing a toll treatment deal with someone else for a chunk of Bronzewings capacity to reduce risk of not being able to supply enough ore to the plant.