Peru's La Oroya smelter auction draws no bids
Brazil's mineral exports to US a mixed bag
Gerdau chairman to testify in Lava Jato probe
Gold, silver slip ahead of Fed meeting

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Chile's Asimet calls for central bank to lower interest rates
Bolivia's mining exports rise on prices, smelter restart
Brazil's iron ore export to BRICS up in first two months
GSM requests silicon metal price probe
Oil slump adds to pressure on gold, silver
Looming Fed action brings down copper