Toll, to my knowledge the Basin does not have phasing.

Several times alreadly I have landed at a node, started mining, got the 'already in use' message. Then the node disappears and there is nobody around. Checking the combat log shows who mined the node. Doing /who shows a level 60 or even lower non-stealth character who can not fly.

When you then fly 30 seconds at 280%+ speed to the next node and the same lowbie mines it while being invisible, you know that there is no way in hell he could have gotten there before you at 150% speed and being ground based.

The simple explanation for this is a teleport hack that places the hacker's char inside the node or inside the ground and just runs down a list of spawn points.