(Hm... If I may throw in some character development with my suggestion here...)
Haven paced around for a while, turning thoughts over in his head to match the glittering rock he turned over in his hands... Such a sheen, and so light... Only perhaps the fable of Adamantine itself could hope to outdo such a rich ore. Pity there was so little of it here... But maybe. He'd come across it at first while collecting rock for the wall outside. But this was far too valuable to be put to use in a wall, everyone there knew that much. They'd suggested he make a craft out of it, but... He couldn't help but feel yet unworthy for such an honor... But if there really was more...
He went off with a start, climbing up through and across the halls until he managed to find Mistem among the several other unfamiliar faces around. It took him a moment to recognise the dwarf, but once he did, he wasted little time fretting. "Athellal... Ah, Mistem? Overseer? Anyhow, look, listen. This ore, it's just.. Amazing. Light like nothing else, polished to put steel to shame! The matter at hand is... Well, I don't think I'm ready to do this proper justice, you see. When the time is right, perhaps, and I've had some time to get my hands used to the feel of stone once again..."
He took a careful breath. That had been the simple part. The next was something he saw, more or less, as a flight of fancy more than anything serious, but still. He'd made up his mind to say it. "If... If we are to stay here in this place... Would it be plausible to find.. More of this? If the stone was right for it in that place, there could be more clusters scattered around here somewhere. Just to imagine... More of this wonderful rock. A single stone working of it, in the crassest, could buy us food and drink for well of a year, but imagine more of it! Fine arts, whole doors and tables and a mighty throne! We would put the legend of Tongsrenown to rest yet, to be paved over with the tales of our own greatness! Surely we would be even the envy of the mountainhomes!"