So the simplest method for extinguishing the Kingsway Brewery Molasses Cable-Run Fire would be as follows:

Smoothing the surface above the fire with heavy equipment to make it fit for traffic.
Drilling holes in the fire zone about 20m apart down to the source of the fire, following a regular grid.
Injecting water or mud in the boreholes long term, usually 1 to 2 years.
Covering the entire area with an impermeable layer about 1m thick, e.g., of loess (ie dust).
Planting vegetation, for example cactuses, palm trees, rafflesia.