Extraction (more commonly referred to as quarrying) consists of removing blocks or pieces of stone from an identified and unearthed geologic deposit. Differences in the particular quarrying techniques used often stems from variations in the physical properties of the deposit itself—such as density, fracturing/bedding planes, and depth—financial considerations, and the site owner's preference. Nevertheless, the process is relatively simple: locate or create (minimal) breaks in the stone, remove the stone using heavy machinery, secure the stone on a vehicle for transport, and move the material to storage.
The first step in quarrying is to gain access to the granite deposit. This is achieved by removing the layer of earth, vegetation, and rock unsuitable for product—collectively referred to as overburden—with heavy equipment and transferring to onsite storage for potential use in later reclamation of the site. After the face of the granite is exposed, the stone is removed from the quarry in benches using a variety of techniques suitable to the geology and characteristics of the granite deposit.
Processing commences with transportation of the (raw block) stone from the quarry to the processing facility, then trim to the size of Gang saw machine. Granite (blocks) will be cut into slabs with 2cm or 3 cm thickness(Generally) as per the need and order. These are most commonly sliced to a thickness of 3/4 in (2 cm) or 1-1/4 in (3 cm) in lengths of approximately10-12 ft and widths around 3-5 ft. The route that the stone takes through the plant therefore depends on its physical state upon arrival, as well as the product to be produced.
This is typically accomplished for granite using a circular blade saw, but a diamond wire saw, a gang saw with steel shot, or a splitter can also be implemented. When operating a circular or diamond wire saw, a continuous stream of water over the saw is required in order to dissipate heat generated by the process; sufficiently-elevated temperature can cause major machine and material damage. Natural-faced products, such as veneer or flooring, may be completed with this step
An array of finishing applications exists, and each uses specific types of equipment to accomplish the resulting appearance. Polished or honed finishing is frequently given to granite products, but thermal finishes are also common. The former is applied manually and/or mechanically through the use of polishing pads, while thermal finishes are applied with a flame or blow torch apparatus. Granite slabs are generally polished one side only using line polishers.
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