Gold edged down early on Friday with investors cautious ahead of U.S. economic data later in the day, but it remained on course for a sixth straight weekly gain.

Spot gold was trading down 0.3 % at $1,356.06 an ounce by 0106 GMT. Bullion is up about 1 % so far for this week.

U.S. gold dipped 0.3 % to $1,358 an ounce.

SPDR Gold Trust, the world's largest gold-backed exchange-traded fund, said its holdings fell 0.42 percent to 978.29 tonnes on Thursday from 982.44 tonnes on Wednesday. 

China's gold reserves stood at 58.62 million fine troy ounces at the end of June, up from 58.14 million at the end of May, the central bank said on Thursday.