You're netting more stone per resource chunk than you would have previously because you aren't removing metal from the resource chunk with each unsuccesful attempt at mining stone. What exactly is your expectation here?The mining option is more of a penalty IMO. it needs to at least have a higher chance to get stone if that's the only thing you're mining for. otherwise you're just giving up more resources to get the same amount of stone with less "moving" to the next mining spot... This is not what people had in mind.