Črni Kal quarry

The Črni Kal quarry is located alongside the Kozina–Koper state road. It got its name from the nearby village of Črni Kal that lies approximately 500 m from the quarry.

The material quarried is limestone that is high quality in terms of its petrographic and mechanical properties. The quarry produces sand, crushed stone and (granular) sub-base materials that are suitable for concretes and road structures (pavements). The quarry also produces chippings (blasted or graded) and blocks of various sizes for the protection of the seashore or watercourses.

The capacity of the crushing plant is approximately 75,000 m3 of crushed materials annually.

The main properties of the stone and fractions are:

• The resistance to freezing and thawing is 0 per cent,
• the swelling pressure is 214 Mpa,
• the rate of wear on grinding according to JUS B.B8.05 is 9.2 cm3 / cm2.

The quarry produces the following fractions:

• ground sand 0 - 4 mm,
• crushed stone 4 - 8, 8 – 16 and 16 - 32 mm,
• (granular) sub-base materials and ground sub-base materials 0 - 32 and 0 - 125 mm.