Gas infrastructure provider APA Group has lifted its guidance for the 2014 financial year on the back of the strong performance of its assets and investments. BHP - BHP BILLITON - down 64 cents, or 1.74 per cent, at $36.18 Mining giant BHP Billiton expects its US shale oil business to become one of its major sources of revenue by the end of the decade, generating almost $US3 billion ($A3.30 billion) a year in free cash flow by 2020. Dexus Property Group and a Canadian pension fund have increased their takeover offer for Commonwealth Property Office Fund to almost $3 billion, trumping a rival bid by GPT Group. OZL - OZ MINERALS - down 44 cents, or 14.24 per cent, to $2.65 Miner Oz Minerals' shares have been smashed after it forecast lacklustre production levels next year and said there had been no increase to resources at its ageing and only operating mine. QAN - QANTAS AIRWAYS - up 2.5 cents, or 2.59 per cent, to 99 cents A deal to secure the short-term future of Melbourne's second airport will provide a platform to bring further flights, the Victorian government says. RIO - RIO TINTO - down 40 cents, or 0.6 per cent, to $65.77 Mining giant Rio Tinto is still trying to find out what caused a toxic spill at its Rossing Uranium mine in Namibia - the company's second major radioactive incident this month. SXL - SOUTHERN CROSS MEDIA - up five cents, or 3.25 per cent, to $1.59 Southern Cross Media Group has reached a deal with lenders to refinance $765 million in debt, as it tries to bring down its gearing levels. BGA - BEGA CHEESE - down four cents, or 0.9 per cent, to $4.40 Bega Cheese has extended the offer period for its takeover bid for Warrnambool Cheese and Butter. YAL - YANCOAL AUSTRALIA - in a trading halt, last traded at 72 cents. Federal Treasurer Joe Hockey has removed foreign investment conditions placed on the ownership of Yancoal Australia.