The following are the biggest percentage gainers on the TSX Venture Exchange in mid afternoon trading with their price movements LYNDEN ENERGY (LVL.V), $0.50, +0.18, +53.85% NTG CLARITY NETWORKS (NCI.V), $0.2450, +0.0650, +36.11% IRONHORSE OIL & GAS (IOG.V), $0.1550,