* G20 pledge to keep aid flowing until recovery reassured

* Materials, chipmakers lead shares higher

* Dow up 1.9 pct, S&P up 2 pct, Nasdaq up 1.8 pct

* For up-to-the-minute market news, click [STXNEWS/US] (Updates to late afternoon with fresh quote, changes byline)

By Rodrigo Campos

NEW YORK, Nov 9 (Reuters) - U.S. stocks rallied on Monday, with the Dow Jones industrial average at a 13-month high, as the Group of 20's pledge to keep aid flowing to the world's economy boosted investors' appetite for risk.

The agreement from G20 finance ministers and central bankers over the weekend boosted global stocks while pressuring the dollar. A gauge of the greenback against a basket of currencies .DXY traded at its lowest in 15 months. [ID:nLQ516726] and [ID:nL9362990]

Mining shares jumped on the back of rising metals prices. Freeport MacMoRan Copper & Gold Inc (FCX.N: Quote, Profile, Research) shares shot up 4.7 percent to $83.32 and the S&P materials sector index gained 3.1 percent.