Silver jumps 5 pct; oil, grains up, copper down

* Spot gold hits all-time high at $1,513.70/oz * U.S. silver up 8 pct to 31-year high of $49.82 * Coming Up: U.S. NAHB housing market index; 1400 GMT By Clarence Fernandez SINGAPORE, April 25 (Reuters) - Silver jumped more than 5 percent and gold rose to a record on Monday as investors sought shelter against a weaker dollar, while prices of grains and crude oil surged on supply fears.

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