--Comex gold options expiry makes for turbulent trading in gold futures
--Reports of more central bank gold buying boost gold prices
NEW YORK--Gold prices edged higher Tuesday amid volatility ahead of Comex options expiration and reports that central banks continued to increase their gold reserves in July.
The most actively traded contract, for December delivery, was recently up $9.20, or 0.5%, at $1,773.80 a troy ...
