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Peru's gold output fell 8.01% year-on-year in the January-August period to 103Mg (3.64Moz) from 112Mg in the same period of 2012, according to the country's mines and energy ministry (MEM).
Gold output in August grew 12.7% to 14.5Mg from 12.8Mg in August 2012.
Copper output grew 5.99% for the eight-month period to 882,510t, and 16.8% to 132,098t for the month alone, both year-on-year.
Silver year-to-date output increased 2.34Mkg (82.6Moz) while production in August was up 6.12% to 294,460kg.
Tin production dropped 12.5% to 15,216t in January-August and molybdenum fell 7.74% to 10,696t in the period.
Iron ore, zinc and lead production also increased in the first eight months of 2013, up 4.35% to 4.67Mt, 5.93% to 917,659t and 1% to 169,394t, respectively.
Peru is ranked among the world's leading producers of copper, silver and zinc as well as being Latin America's top gold producer (ranked 6th globally).