This is testing the ol' memory a bit. I flew the Dash 8 briefly in Oz. It's a Cat B aircraft. If we wanted to fly it faster for whatever reason in the approach/circle to land then we'd have to use the Cat C requirements so we remained in the protected area.
Have a squizz at the charts to see what the circling minima is and stay within that for Cat C. That should keep you safe and away from the ground/terrain.