The DFS states they will use diesel in the amount of 1500m3 per month to run the boilers.
When the reach their production targets of 15,000 tonne per year, as I see it, the carbon intensity of the final product is still low relative to other production methods despite the seemingly high fuel use. You can do the math on carbon intensity of the fuel use.
Electricity is an alternative if available but that's not what's priced for in the DFS.
Yes a question to the company would give clarification but from where I sit the co2 intensity looks low but not near neutral. I'd like them to find away to reduce this if possible but I am not concerned.