I was waiting for Stormi or one of the other Northern Alberta riders to jump in...
but, here is a link to a video of the annual 24 hour NumbBum ice race:
http://www.watch-motorcycle-videos.com/watch/?vid=2111Ice racing on motorcycles is fairly common in Alberta. Usually the hot ticket is converted Motocross bikes, although Flat Track bikes work great as well. Here in Western Canada the tires are studded with hardened "sheet metal" type screws, usually in Motocross tires, but I have seen various tires used, including Trials, Dual-Sport and Flat Track, in addition to various Motocross compounds. The fast guys are always trying to get an edge with different compounds and stud patterns.
I haven't watched an outdoor race since I left Alberta in 1988, and personally have ridden on the ice with studded tires since the late 70's, but it's fun. The traction is similar to dirt, even once the surface gets chewed up. I have gone to see Ice Speedway races, which are a blast, run in hockey areas. Just like Dirt Speedway, which you don't see here. Same bikes, Jawa's and Westlake's, etc.
This is getting my blood boiling. I might just have to go get a set of tires and set up one of my dirt bikes again...getting the snow off one of the local lakes is going to take work however, but I think I'll go have a look around this weekend...
edit for more info...
It looks like the Greater Kamloops Motorcycle Assoc(GKMA) holds Ice Races in Jan and early Feb on Stake Lake, south of Kamloops...here is a link to the rules
http://www.gkma.ca/IceRacing/Rules.asp