I thought you didn't need to move an MFR mining laser? Just plant it over bedrock and feed it energy to get ores to spawn from thin air.
Not thin air it actually pulls ores from the ground there's just a huge radius. I think it is 8 chunks every way. My setup moves every 1 real world hour (Because of diamond depletion)
It did random gen them at one point though. It might be a config thing that I changed when I was trying to make other mods harder as well.