By Sudeshna Ghoshal

July 21(Reuters) - Canada's main stock index climbed on Tuesday, buoyed by miners that tracked higher metal prices, while investors assessed fresh U.S.-Iran tensions and new U.S. tariffs on Canadian imports.

The S&P/TSX Composite Index .GSPTSE was up 0.5% at 35,144.23 points by 11:14 a.m. ET.

• U.S. President Donald Trump imposed 50% tariffs on a broad range of Canadian imports on Monday, which Treasury Secretary Scott Bessent said amounted to "reciprocity" for trade actions Ottawa had taken on American dairy, alcohol and beverages.

• A Financial Times report said on Tuesday that Trump was poised to unleash fresh tariffs on dozens of countries as soon as this week.

• Michael Dehal, a senior portfolio manager at Dehal Investment Partners at Raymond James, said that the materials and manufacturing sectors were in focus now, given the renewed tariff threat.

• Gold prices climbed more than 1% on hopes of a diplomatic breakthrough between the U.S. and Iran, boosting the materials sector .GSPTTMT. Miners including Discovery MiningDSV.TO, Eldorado Gold ELD.TO and Hudbay Minerals HBM.TO advanced over 9% each.

• Heavyweight energy stocks .SPTTEN gained 1.4%, tracking a 2% jump in oil prices following fresh attacks between the U.S. and Iran, and after Yemen's Houthis threatened a naval blockade targeting Saudi Arabia.

• U.S. and Mexican trade negotiators are set to meet for a third round of bilateral talks later in the day to try to push forward with revising the North American trade agreement.

• Separately, Canada's biggest pension fund, CPP Investments, is tapping large foreign investors from central banks to insurance companies to grow its bond program.