CANADA STOCKS - TSX rises 0.38 percent, helped by materials

SAN FRANCISCO, June 6 (Reuters) - * The Toronto Stock Exchange's S&P/TSX rose 61.68 points, or 0.38 percent, to 16,183.93 points. * The biggest contributor to the TSX gain was Nutrien and materials was the top sector contributor, up 1.7 percent. * Leading the index were Aurora Cannabis Inc, up 12.4 percent, Valeant Pharmaceuticals International Inc, up 7.5 percent, and First Quantum Minerals Ltd, higher by 7.1 percent. * Lagging shares were IAMGOLD Corp, down 3.9 percent, Empire Company Ltd, dow