Carrières MBTP Carrières MBTP is a company whose activity is the exploitation of alluvial deposits and solid rock quarries in the Ain and Savoy departments. It is based at Saint Genix-sur-Guiers (73). It posts sales of €4m with a payroll of 20. Customers are construction and civil engineering firms, local authorities, concrete mixing stations, inter-commune syndicates and members of the public. The sites it operates are: Bregnier Cordon, for underwater alluvial deposits ; Murs et Gélignieux, for limestone ; Champagneux and La Balme, for crushed limestone.