Hi, actually this is an interesting looking bike,
it looks a bit like early Ritchey-build Kelly Fisher "MountainBikes"-labled bikes like this Montare from 1983 as shown at Mombat
Just I'm pretty sure, this Carrera is rather a cheap copy and we came across a pretty similar bike in Germany quite a few times, because this was also sold from the traditional German brand Göricke 1985 or 1986.
Also the Göricke had same decals "Mountain Bike", just yours had it on the top tube.
Here is another a bit younger one with no bullmoose any longer but a Sakae stem.
I'm pretty sure neither Carrera nor Göricke was producing this bike, but it was already back in time mid 80ties an early Asian copy of a Californian-style mountain bike like produced by Ritchey.
With that it's also similar to the early Stumpjumper models, just Mike Sinyard was more successful in gaining attraction and market share as Carrera or even Göricke back in time.
Rocky Mountain was selling Ritchey-build bikes too, they are mentioned as Canada dealer at the bottom of the Fisher Kelly MountainBikes Ad from 1983 I have posted above.
Rocky Mountain was selling Ritchey-build bikes too, they are mentioned as Canada dealer at the bottom of the Fisher Kelly MountainBike Ad from 1983 I have posted above.