ABSTRACT
The pilot study was carried out in a company located in the North of Portugal. The activity is characterized by quarry exploitation (gneiss), and it is responsible for the production of crushed aggregates and riprap to coastal protection. This company is constituted by 180 workers, 30 of them are associated to the quarry, and the operators’ number is around 10. For this, the work procedure includes different phases: rock removal, selection of the material for riprap, transporting the remaining material to the processing plant for the production of crushed aggregates, storage the material by granulometry in silos with large capacity or in open air stocks and, at the end, the loading system.
