Hefty losses in key TSX sectors over commodities, global fears

By Solarina Ho TORONTO (Reuters) - Canada's main stock index tumbled more than 1 percent on Tuesday to levels not seen since January, as worries at home and abroad drove miners, oil and gas companies, and banks sharply lower. First Quantum Minerals plunged 12 percent to C$13.94, while Toronto-Dominion Bank declined 1.1 percent to C$52.15. Gold and copper prices fell to multi-month lows due to instability created by the Greek debt crisis and a stock market rout in China.