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* FTSE 100 up 0.4%, FTSE 250 up 0.2%
* Miners boost blue-chip index
Sept 2 (Reuters) - London's FTSE 100 weathered the impact of the latest U.S.-China tariffs on Monday, thanks to mining stocks as iron ore prices jumped after China pledged support to its economy and nickel prices gained on Indonesia's move to expedite ore exports ban.
The main index .FTSE added 0.4% as shares of heavyweight miners Rio Tinto RIO.L and Glencore GLEN.L advanced 1% each, while consumer goods firms and healthcare stocks also supported the index.
The mid-cap FTSE 250 .FTMC inched up 0.2% by 0713 GMT.