By courtesy of The Fletcher Trust Archive and text explanation by Stuart Ward.
Here are the two mills – the closer mill – a tube mill (ball mill) is the cement mill (not running – man standing on it). The mill behind is the raw mill (behind the man standing on the ground facing the cement mill). The bin feeding the cement mill is in two compartments – the closer larger part for clinker, and a smaller gypsum compartment. Beyond the cement mill feed bin is the raw mill feed bin. All bins loaded by the overhead grabbing crane. Obove the raw mill is the separator, from whence the meal is collected in the two cyclones and then into the bag filter. There would have been a raw meal silo, possibly just out of shot to the left, and a cement silo too.