I was wondering whether there are any sound studies on mining in microgravity. For example, smelting iron (out of ore) in weightlessness has been described and (in theory) solved. Also, there are people working on, for example, excavators for the Lunar surface, which does have a noticeable field of gravity compared to microgravity one would experience near an average asteroid.
I am looking for studies on drilling, digging and rock blasting (or processes substituting the previous) on asteroids, which have a rather weak field of gravity. How can this be done? I am also interested in how the excavation material can be handled, if it was ever described.
EDIT: In Undo's answer, there is a link to a website. It includes the following statement: "Some studies adopted tunnelling to mine an asteroid." But it does not give any references. I would really be interested in such a study.