Quarries
| Aytos quarry |
| Location: town of Aytos, Burgas District |
| Type of Material: ash tufas and tuff admixtures. |
| Depth of stock reserve - to date 01.01.2009 г: 1 337 775 m3 |
| Karnobat quarry Sreden Kayryak |
| Location: town of Karnobat, Burgas District |
| Type of material: Andesite tufas |
| Depth of stock reserve - to date 01.01.2009 г: 7 949 074 m3 |
