translate English to French: Our mine used 200 tonnes of steel grinding balls which contain 15-18% of chromium (excluding hexavalent chromium).These grinding balls are totally consumed during processing after primary crushing.Do we need to report for chromium?
Notre mine a utilisé 200 tonnes de boulets de broyeur en acier qui contiennent de 15 à 18 % de chrome (à l'exclusion du chrome hexavalent).