The natural stone sector has traditionally been regarded as a high energy and high raw material consuming industry. Nevertheless, over the past decade, both global sustainability pressures and the sector's own internal transformation dynamics have made it necessary to redesign the environmental footprint of the aggregate supply chain. At Alpay Doğaltaş, as we carry out supply from Turkey's various calcite and dolomite deposits, we observe that aligning the sector with circular economy principles is a path that pays off both environmentally and economically. Sustainable aggregate supply is not merely a marketing slogan but a technical and ethical transformation that secures the long-term existence of the sector.
The residues that emerge during the marble cutting process represent one of the most important waste value opportunities in the natural stone sector. During the conversion of marble blocks into slabs, tiles, or custom-sized products, a certain proportion of pieces and fragments are generated at the cutting, breaking, and shaping stages. While these residues were once treated as worthless waste, today they are converted into calcite aggregate in different classes through technical processing. The partner processing facilities in our supply chain classify these residues according to specific granulometric curves, transforming them into products suitable for landscape, concrete, and filler applications. As a result, a higher proportion of every ton of stone extracted from the natural source is given economic value.
The environmental impact of waste value transformation is multilayered. At the first layer, using a higher proportion of the raw stone extracted from the deposit reduces the need to extract additional raw material. At the second layer, evaluating processing facility residues instead of directing them to the environment or storage areas lowers waste management costs and reduces visual pollution. At the third layer, circular use reduces the carbon footprint per unit of raw material. Because the shared cost at the energy-intensive extraction stage of aggregate produced from residues creates a lower environmental impact compared with initial production.
Circular economy principles in the aggregate sector are not limited to waste transformation. Efficiency improvement at every stage of the supply chain can be redesigned from a circular perspective. At the logistics stage, optimizing the use of containers and big bags, preferring recyclable packaging materials, and planning shipment routes with fuel efficiency in mind are concrete steps of the circular approach. The proximity of the Saraylar area of Marmara Island to Istanbul and the European markets via sea route offers a natural advantage for low-carbon logistics, both economically and environmentally. Compared to road transport, sea shipment generates significantly lower emission values per ton-kilometer.
