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

Cliffs Natural Resources Inc Co (symbol: CLF) was one of the worst losers
of the trading day today (2016-05-03), losing -11.93%. The number of shares
that changed hands was 13,589,347, or about 2 times the average daily
volume in the stock.
The closing price was $4.65, amounting to a market cap of $712,740,000,
about -32.31% off the highest price in the last 12 months. The stock has
been trading at a range between $1.2 and $6.87.
CLF is in the Precious Metals industry, part of the Basic Industries sector.