$BVN is one of biggest losers #stocks today. read more:

Buenaventura Mining Company Inc (symbol: BVN) was one of the worst losers
of the trading day today (2015-07-20), losing -14.72%. The number of shares
that changed hands was 3,008,422, or about 2 times the average daily volume
in the stock.
The closing price was $7.3, amounting to a market cap of $1,860,000,000,
about -50.74% off the highest price in the last 12 months. The stock has
been trading at a range between $7.2 and $14.82.
BVN is in the Precious Metals industry, part of the Basic Industries
sector. It first went public in 1996.