[en] On a previous work it was observed an increased frequency of chromosomal damage on peripheral blood lymphocytes of miners comparatively with non-miners controls. On this study, that complements previous work, we present a detailed analysis of chromosomal aberrations of one thousand of metaphases, on cases that the miners' lymphocytes exhibit dicentric chromosomal aberration. We saw an over dispersion of damage on cells, and a linear relationship between the total chromosomal damage and working years on mines