The company was founded in 1948 as Kamenni Karieri (Rock Quarries) Enterprise, Ruse. It developed small limestone quarries in the regions of Rousse, Razgrad, Lovech and Targovishte, where rough large-size stone blocks were extracted, mostly through manual method. Initially, the company functioned under the administration of the Ministry of Construction. Lime production was developed subsequently, however it was later discontinued and closed down as the lime furnace became worn out. Later on, underground mining of blocks of Rousse limestone was organized and carried out manually, supplying raw material for varied stone products and facing slabs. At Krassen and Bassarbovo deposits. In 1977 the Krassen deposit became exhausted and the mining was confined to the Bassarbovo deposit. In 1968, German-made stone cutting machines were bought and put into operation to mechanize the process. With the years passing by, a number of small quarries of the size of Chereshovo and Pirgovo quarries were successively closed down, as the demand for rough large-size stone blocks was reduced and finally came to an end. Others, like the Boaza Quarry in Razgrad, were transferred to the structure of other companies. In 1967, the company was renamed Stroitelni Materiali State Enterprise, and in 1970 it became Karierni Materiali Production Department. After the Ministry of Mineral Resources was founded, the company was reorganized in Rock Materials Extraction and Processing Works under this Ministry. Later on, when the metallurgical industry in the country was placed under the Ministry of Mineral Resources, and enterprises were integrated to form industrial works, the company entered the system of DOSOM Industrial Works, Iskar Station. In 1976, the Balchik Mine, town of Balchik joined in, whereafter the company became member of the Mineral Resources Economic Unit.