If they want to be realistic then unfortunately you cannot 'suck' anything from space since since you can't create a lower pressure than than which exists in a vacuum.
Umm, correction sir, you apparently have not heard of the "Dyson Donut Space Vac Module ©", first developed in 3283. It provides suction by making a donut shield, an inner and outer shield filled with a proprietary pressurized gas. Actually spherical rather than a donut, but it seems the marketing term donut sold better, I dunno why. (Mmm donuts). As it sweeps an area, the inner shield, about 5m in diameter, fluctuates at high frequency allowing for a proprietary sucking vacuum action. There's a little more to it, but it's proprietary.
It shouldn't really be feared, since only the first model revision was dangerous. The sucking power was so powerful it randomly and accidentally bent space/time and teleported it's users to the farthest reaches of space, oops. As expected with no one to report the problems, it understandably took them a while to track down the bug. It wasn't until until they once replicated it in house accidentally and lost some of their Dyson R&D staff at their HQ test area with onlookers left gasping, who still to this day not having returned from wherever they were teleported to, but all is well now.
It really is one of those things that has to be seen in action to be believed, but there it is...
I digress, just some forum humor to brighten the day...back to seriousness of how to best extract ore in space and other speculation of hypotheticals at gamescom...