AGO - ATLAS IRON - down 5.25 cents, or 6.23 per cent, at 79 cents AJM - ALTURA MINING - up 2.00 cents, or 18.18 per cent, at 13 cents Atlas Iron will start work on a new Pilbara iron ore mine after the company's board approved the $146 million project. LNC - LINC ENERGY - up 2.00 cents, or 2.05 per cent, at 99.5 cents Companies trialling a gas extraction process in Queensland will be asked to prove they can put out underground fires. NCM - NEWCREST MINING - down 81.5 cents, or 7.59 per cent, at $9.915 RHG - RHG - up 6.00 cents, or 15 per cent, at 46 cents The board of mortgage business RHG - formerly RAMS Home Loans - has recommended its shareholders accept a $144 million takeover deal. WHC - WHITEHAVEN COAL - down 1.5 cents, or 0.65 per cent, at $2.285 Workers have walked off the job at a Whitehaven Coal mine in northwestern NSW in protest at plans they say will destroy local heritage sites.