From Credit Suisse:
Iron ore turns up, once again confounds bears on the Street
Iron ore once again confounded those calling it down by jumping at the end of June. However, this was predictable. In late May and early June we were hearing anecdotally (Platts) that some steel mills were on-selling contractual cargoes of iron ore to repay quarterly loans due at the end of June. That was a destocking event which inevitably put pressure on the price by adding cargoes to the daily sales list. But by the end of the month, loans were met and destocking is always followed by restocking.
