Iron ore price charts for September 19, 2016:

Tianjin benchmark fell 0.4% to $55.30. Paper rallied overnight on housing bubble hopes. Rebar is sinking. That’s the key signal now. Port stocks rose a modest 150k to 103.25mt tonnes. So far, a 3mt ports destock has dropped prices 10%. Iron ore prices are going to fall much further yet.
RIO is happy:

