By Solarina Ho TORONTO (Reuters) – Canada’s main stock index was little changed in thin Easter holiday trading on Monday with drops in Barrick Gold Corp and TransCanada Corp , which was hit by another delay for its Keystone XL pipeline project, offsetting gains in other groups. TransCanada was the biggest drag on the index, closing down 3.7 percent at C$49.38 after the Obama administration again delayed a decision on whether to approve the Keystone project. The TSX index’s energy group, of which TransCanada is a part, was off 0.05 percent. The heavily weighted materials group, home to gold miners, was down 0.4 percent, hurt by Barrick, which fell 3.9 percent to C$19.03.