Silver declined on Monday falling to the weakest level since September 2010 pushing the gold-silver ratio to the highest level in almost 33 months, while gold continued to slide extending the slump to the longest in four years. Silver May futures slipped 8.6% to $20.3395 an ounce and were $21.5662 at 9:49 a.m. London time, while gold for delivery in the same month decreased 1.5% to $1,338.85 an ounce.