It seems that most mining proposals involve landing on the body (blasting pieces of asteroids up from the surface for measurement has been proposed), would it be practical to exploit the volatile nature of cometary material (and availability of solar energy) to extract cometary material without having to land on the comet?
Scooping from the ion tail might be more practical (dust might require a more robust scoop) and desirable (comets are more special for their volatile content).
The cost of developing specialized comet mining technology (not just the scoop but also the navigation) would be spread over a smaller number of uses, so it is probably unlikely to be economically practical. However, this seemed like an interesting question.
(One of my concerns with landing on a comet was the perception of greater danger near Earth orbit--when the comet if fully active--than an asteroid.)