Vancouver-headquartered B2Gold is mulling an expansion at the El Limon mine, announcing on Monday that it is considering a $35-million investment to increase production at the Nicaragua-based mine. B2Gold has concluded an expansion study, which indicates that increasing plant capacity from 485 000 t/y to 600 000 t/y and adding a third stage of milling to achieve a fine grind will result in a much longer mine life, with higher gold production and lower costs.