Listening to Anavren's painstakingly detailed report, Elscene wonders what possible use they could make of knowing that this metal can only be broken by accident and not by purpose. If they found it, they'd want to break it, rendering it unbreakable.

'Why would you think this is a nephelium mine? And how will knowing that we can't break the metal help? By your own statements, it seems like we were in a better position when we didn't know it wasn't breakable ...'

She continues to ponder this ... knowledge, as she turns back to enter the mine, the elf put out of her mind. Another hand in this quest probably couldn't hurt.