Rio Tinto charges higher, IRESS rockets, Macquarie update

At lunch on Thursday, the S&P/ASX 200 Index (ASX: XJO) is on course to record a solid gain. The benchmark index is currently up 0.4% to 7,407.6 points.

Here’s what is happening on the ASX 200 today:

Market reacts positively to Rio Tinto half year…