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

Cliffs Natural Resources Inc. (symbol: CLF) was one of the biggest winners
of the trading day today (2016-04-28), gaining 25.06%. The number of shares
that changed hands was 47,343,289, or about 6.9 times the average daily
volume in the stock.
The closing price was $5.39, amounting to a market cap of $826,160,000,
about -21.54% 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.