The following are the biggest percentage gainers on the TSX Venture Exchange in mid afternoon trading with their price movements HALMONT PROPERTIES (HMT.V), $0.97, +0.37, +61.67% BLUMETRIC ENVIRONMENTAL (BLM.V), $0.22, +0.06, +37.50% PROFOUND MEDICAL (PRN.V), $0.95, +0.20, +26.67% DESERT