I gotta go with Marcus on this one. All his points are valid. If you want to keep “ninja miners” away from “your” ore, make sure the rock blasts when everybody in your corp can be online, or just get rid of the athenor altogether if you as a corp/alliance cannot successfully mine the rock out, before others come in and take it.
ALL asteroid/moons belong to concord, so its up for anybody to take a piece of the pie. How they get it, doesn’t matter to concord. While very very few would be asking permission to mine, others will just come and take it if the opportunity arises… and you have access to the names of anyone who takes it. make examples out of them and go after them or hire a merc to take them out.