The following are the biggest percentage decliners on the TSX Venture Exchange in mid afternoon trading with their price movements DATAMINERS CAPITAL (DMC P.V), $0.0150, 0.1050, 87.50% PETRO RIO (PRJ.V), $0.12, 0.11, 47.83% ONENERGY (OEG.V), $0.3050, 0.1450, 32.22% MIDPOINT