02/20 was the shortest and narrowest of YQG's runways, at 3833'x100'(plus paved shoulders of about 30's on each side). The other two runways are 12/30 (5150'x150'), and 07/25 (recently lengthened to 9000'x200', 25 is the only ILS equipped rwy at YQG). Runway 25 is used most of the time, due to wind direction, it's size, and convenience for arriving a/c. Despite the fact that the wind is usually from the WSW, rwy 30 is used often for departures of commercial a/c, probably due to the fact it requires the shortest taxiing distance from the terminal. When rwy 02/20 was still active, it was used mostly as a taxiway to connect the terminal and GA areas of the airport to rwy 07/25 (it has no parallel taxiway), and on occasion it was used for GA a/c.
Here's a pic of YQG:
You can see the terminal in the southern edge of the airport (the big ramp), adjacent to rwy 12/30, rwy 02-20/twy F crosses rwy 12/30 at an almost right angle, and rwy 07/25 is at the north (that's an older image, from when 07/25 was still 7850' long).