Step 1: Extraction
Materials’ extraction takes place after a long cycle of preparatory work which includes:
• The stage of the topsoil stripping, which is done by bulldozers or by shovels.
• The phase of the extraction of the altered rock due to explosive shots. Once the sound rock is discovered, we move on to slaughtering by explosives.
The slaughter products are then loaded by the wheel loader and transferred to the crushing and screening plants.
Step 2: Transfer
Transfer to grinding and sieving plants is carried out via dumpers or semi-trailers.
Step 3: Crushing and Screening
The materials are first inserted into the feed hoppers to undergo scalp selection in order to separate between the pebbles and the fine ores.
These fine ores are then conveyed to the scalping products stocks.
The pebbles afterward forwarded to a series of crushers in order to reduce the size of aggregates and obtain smaller and smaller fractions.
After each crusher, the products are routed through a vibro-sieve to select the aggregates according to their size. Indeed, the sieving allows only the elements below a certain size to pass through its meshes. It is so possible to obtain aggregates of various sizes after successive sieving.
The products obtained are either:
• Loaded directly on trucks and / or semi-trailers by activating the automatic loading tunnels.
• Or stored in heaps and per fraction.
Step 4: Storage
Materials are stored in piles by categories:
• Crushing sand
• Cement blocks
• Run material
• Reconstituted Crushed Gravel
• Reconstituted Humidified Gravel
Step 5: Delivery
Delivery of the end-products is carried out either by:
• Loading tunnels directly on trucks and / or semi-trailers.
• or loaders that serve customers from finished product inventories.
The aggregate transport fleet is systematically heeled, and all deliveries are weighed by weighbridges.