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extraction li of mineral stone

limestone extraction | solancis

limestone extraction | solancis

Before beginning the quarrying process, a resource analysis is made. This study investigates the existence and quantity of stone at the site and also the economic viability of the process. Normally the existence of quarries in the vicinity is enough to advance with the quarry. If there is no quarries in the vicinity, the resource analysis is made by way of an in-depth geological study.

Depending on the surface's orientation, there are two way to begin extraction. If the surface is horizontal, a first cavity is cut for the insertion of the saw and the consequential horizontal cut, allowing for extraction of larger blocks.

When the surface is vertical or slightly inclined, initially the rock will be cut vertically and then at its base. A piece of rock, which can weigh up to 500 tonnes, is thereby separated from the bench. The cut is removed and, now on the horizontal, is cut into smaller slabs. The smaller dimensions allow for easier handling and transport.

The natural stratification of the rock happens on a slight incline, whereas the cut to remove the block is made on the horizontal. This makes it necessary that the cut of the block is aligned with the stratification of the rock. This process is called "acorromar" in Portuguese.

In this way, the bench results in around 25 blocks which are then classified according to the type of stone. These are stored at the quarry and, according to demand, are transported to the factory to be transformed.

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