TORONTO, June 25 (Reuters) - Toronto's main stock index could open mixed on Thursday as firmer oil and gold prices boost some resource firms, even as a jump in U.S. jobless claims weighs on sentiment.

World stocks slipped on Thursday after the Federal Reserve cautioned that the U.S. economy would remain weak for a time, adding to concerns about the sustainability of a recent recovery. [ID:nLP704576]

And U.S. stock index futures fell after U.S. government data showed the number of workers filing new claims for jobless benefits unexpectedly rose last week. [ID:nN25257776]

On Wednesday, the S&P/TSX composite index .GSPTSE rose 204.21 points, or 2.06 percent, to 10,100.93, after an Organisation for Economic Co-operation and Development report said the global economic outlook has improved for the first time in two years.

Here is some news that could affect the market:

TECK RESOURCES (TCKb.TO: Quote, Profile, Research)

Canada's Teck Resources (TCKb.TO: Quote, Profile, Research) expects to reduce copper output at its Highland Valley mine by about 16,000 tonnes in the second half of the year and 52,000 tonnes in 2010, due to geotechnical issues, it said on Thursday.[ID:nLP155866]

MAGNA (MGa.TO: Quote, Profile, Research)

Neither the German government nor bankrupt U.S. carmaker General Motors GMGMQ.PK will admit it, but rival suitors for GM's Opel unit are likely just pawns in a high-stakes game of poker with favoured bidder Magna.[ID:nL41006436]