When the ore strikes the canopy, it will be deflected so that it tends to rotate with the canopy, eventually sliding down by the centrifugal force to a collection point. This would add a little bit of complexity to the canopy concept. Much of this multifaceted database is published in the above paper. The abovementioned paper also goes into the likely geologies and classifications of comets based on a resourceful collection of scientific analyses of comets based on observations by spacecraft and telescopes, and his skills and experience in minerology and geologic processes. Since we know for sure that this asteroid is a captured comet, we would be assured of getting all the volatiles we would need for a long, long time.
Asteroidal material is exceptionally good ore requiring a minimum of processing.
The required equipment is quite simple. At the input chute, the ore will be ground up and sieved into different sizes as the first step of a basic ore processing system. Most asteroids probably offer far more crumbly material than we could consume in one mining expedition. Simple mechanical grinders, using a rocking jaw arrangement for coarse crushing and a series of rollers for fine crushing, are arranged in a slowly rotating housing to provide centrigufal movement of the material. Vibrating screens are used to sift the grains for directing them to the proper sized grinders.