1. Raw materials
The main raw materials used for the production of cement are limestone and clay. New generation surface miners quarry limestone and bulldozers excavate clay.

2. Crushing
The raw materials are transported by trucks to the crusher where they are crushed to small pieces, not bigger than 75 mm.

3. Prehomogenization
Limestone and clay are pre-homogenized separately in a special hall. 

4. Milling of raw materials
The two raw materials are accurately proportioned by the quality control department and are milled in a vertical mill being dried at the same time using the hot kiln gases. The product, raw meal, is a whitish fine powder and is stocked in a silo for subsequent use in the kilns.

5. Storage and homogenisation of raw meal
Raw meal is stored in a special silo where it is continuously intermixed by compressed air so as to obtain a uniform and homogeneous blend.

6. Calcination of raw meal
The raw meal is calcined in rotary kilns where coal burning produces temperatures in excess of 1,600 deg C. The product is called clinker, a dark grey granular material. The clinker produced is quickly cooled down and stored in silos.

7. Cement milling
Inter--grinding of about 95% gypsum rock produces ordinary Grey Portland Cement. In the case of Portland-Pozzolana Cement about 7-10% of Pozzolana is also inter-ground with the above constituents. The addition of gypsum rock is necessary in order to control the setting characteristics of the cement produced.
The cement produced is stored in concrete silos from where is extracted and fed to the packing and dispatch department.

8. Packing and dispatch
Cement is drawn from the silos and sold either in bulk or in bags of 50kg or 25 kg each.