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Revegetation and cattle production are major objectives in the reclamation plan for mine tailings at the Highland Valley Copper mine in Canada. Residual molybdenum (Mo) in the tailings is imbibed by vegetation and forages accumulate up to 400 ppm Mo at the Highmont tailings pond. Grazing studies with cattle determined the feasibility of utilising the site for livestock production and published results are reviewed. Clinical evaluations (1999?2001) revealed signs of lameness, diarrhoea and hair coat depigmentation in cows but they recovered without treatment. Supplement trials (2002 ? 2004) demonstrated the efficacy of copper (Cu) sulphate for the alleviation of clinical disorders. Dietary Mo was rapidly eliminated...