* Gold up more than 4% so far this week
* Silver slips, but headed for best week in over three decades
* Dollar index near two-year low, equities retreat (Recasts, adds comments, updates prices)
By Eileen Soreng
July 24 (Reuters) – Gold resumed its march toward $1,900 on Friday as an escalation in the U.S.-China spat added further safe-haven fuel to a rally to a nine-year peak driven by fears over the economic hit from the coronavirus pandemic.
Silver, meanwhile, was en route to its best week since 1987.
Spot gold was up 0.3% at $1,892.32 per ounce by 1002 GMT, having hit its highest since September 2011 at $1,897.91 on Thursday.
U.S. gold futures rose 0.1% to $1,890.90.