This seems pretty definitive:
...a sixth hole will be drilled later in the week, Murray said. But that could be the last one.
"After the sixth bore hole, we don't have any more options."
Rescuers will not drill a 30-inch hole in order to send down a cage large enough for a human being. Such rigs have been used in past mining rescue efforts, but only after signs of life were recognized.
"If we find someone alive, which is very unlikely, we will continue our rescue efforts," Murray said. "But the use of a 30-inch hole is useless unless there is a live miner in there. I can't put a human being down there unless I find a live miner."
The Crandall Canyon mine may well be the last resting place for the trapped miners, Murray said.
"We're already discussing how to honor these men -- if this is a site in perpetuity."
http://www.sltrib.com/ci_6688698