• Bullion is up more than 1% for the week.• Silver, platinum and palladium lead weekly gains.• Analyst: Gold may need additional catalysts to break $2,500.• Minutes from the Fed's July policy meeting will be released on Wednesday. Gold prices rose slightly on Friday and were expected to post weekly gains on growing optimism about a U.S. interest rate cut in September, although expectations that the Federal Reserve will pursue aggressive easing have softened ahead of Chairman Jerome Powell's upcoming speech. Spot gold rose 0.3% to 2,462.82 an ounce as of 1002 GMT and is up more than 1%...