INTRODUCTION: Quatzite quarrying has been a long ongoing activity in the region of São Thome das Letras, Minas Gerais, Brazil, and 2000 workers are involved in its extraction and processing. However, only recently silicosis has been consistently reported. OBJECTIVE: To describe the occupational and radiologic profiles of a group of workers in São Thomé stone production. METHODS: Occupational and X-rays data were analized in a workers' health center, and a series of 46 cases were selected from a group of 185 extraction and processing workers. Results: All 185 subjects were male, with average age of 41.3 years and median exposure time of 6.1 years, and 46 of them (24.9%) presented radiological images compatible with silicosis. Silicosis was more frequent in stone processing, where the most severe cases were found, including 3 workers with large opacities and 8 with accelerated forms of the disease. The latter were, generally, of younger age and with shorter exposure time, suggesting exposure to higher silica concentrations. CONCLUSION: Despite the limitations of the study, the high occurence of silicosis in the group suggests that adopted measures to prevent silica dust inhalation has been inefficient and have worsen in recent times as a consequence of the intense mechanization taken place in the last years. Adequate surveillance and prevention measures should, therefore, become priority in this industrial sector.
silicosis; São Thomé stone; quartzite; silica; quarry
