The May output of tin-in-concentrate was only 2,189 tonnes, down 24.7% year-on-year, and production of the other base metals was down by between 4.7% (copper) and 10.1% (lead).

The San Rafael mine in Puno province, which is the only tin producer in Peru, operated at reduced capacity from  last September, due to temporary restrictions on tailings disposal which have  now been lifted. The mine returned to full production of some 3,000 tpm at the end of May.