Optimism about a US-Iran deal boosts shares and $A; coal miners rally on China mine disaster; Guzman y Gomez faces potential US lawsuit; Charter Hall jumps on guidance upgrade. Follow live.

The Australian sharemarket has climbed at the open while oil prices have tumbled on rising hopes of an end to the Middle East conflict.

The Australian sharemarket closed in the green while oil prices fell, amid rising hopes of an end to the Middle East conflict.