Canadian shares declined for a second day, led by miners, as gold fell for the third time in four days. The commodity-heavy Standard & Poor’s/TSX Composite Index (TSE:OSPTX) slid 0.2 percent to 12,633.81 at 12:38 p.m. in Toronto on Friday. The 237-member gauge has gained 1.6 percent this month. The materials subindex, which includes mining shares, fell 0.7 percent. The energy subindex slipped 0.4 percent as oil dropped for a fourth day, while financials, the most heavily-weighted group, slid 0.2 percent.