gold prices softened for a second day on tuesday sending the mostactive futures contract for the yellow metal to its lowest level in a week as a rebound in the us dollar continued   gold futures gcz22 expiring in december were down 670 or 04 to 1791 per ounce on comex   silver futures siu22 expiring in september were off 20 cents or 1 to 2007 per ounce   palladium prices pau22 for september delivery retreated 3630 or 17 to 2122 per ounce while platinum prices plv22 shed 650 or 07 to 927 per ounce   copper for hgu22 september delivery was up by 1 cent to 363 per pound recouping some of monday’s losses following a broadbased selloff in industrial metals and oil what analysts are saying gold prices have softened early this week as the yellow metal retreated below the key 1800 per ounce level leaving it on track to snap its longest streak of weekly gains since december “the fact that gold isn’t shedding too much of its recent gains could be a positive sign over the medium term although it would have to overcome what has become a strong barrier of resistance this past week” said craig erlam senior market strategist at oanda the ice us dollar index dxy  a gauge of the dollar’s strength against a basket of rivals was up 03 while the 10year treasury yield ty00 gained three basis points to 2823