COMMODITIES-Drift higher as platinum, wheat take focus

* Talk of revisiting SPR plans nips oil rally
* Platinum, palladium jump again on S.Africa mine violence
* Wheat leads grains gains, Moscow says no export ban
* Trading volumes down a third in depth of summer lull

NEW YORK, Aug 17 (Reuters) - Commodity markets closed out a
languid summer week with mostly minor gains on Friday as talk of
releasing strategic reserves dampened oil's recent rally while
violence in South Africa drove platinum sharply higher for a
second day.
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