Stocks to watch at close on Tuesday Stocks to watch on the Australian stock exchange at close on Tuesday: BLY - BOART LONGYEAR LTD - down three cents at 88.5 cents Infratil, which is mulling the float of its Z Energy chain of petrol stations, reported a drop in full-year profit after writing down the value of its UK airports and recognising accounting charges. Mining services provider Macmahon Holdings' shares have shot up by more than 20 per cent after it detailed positive growth in a "changing and challenging environment."