When dwarves where a thing, they had kingdoms all over Fayrun. The biggest one in the North was Delzoun which stretched 400 miles from east to west, thrived for almost 4000 years and fell 1500 years ago.
They mined Kelvin's Carin for 200 years until the Bruenor reclaimed Mytril Hall (100 years ago) (In the book, Streams of Silver ) They abandoned Icewind Dale completly for Mithral Hall
Over the next decades dwarves moved back to Kelvin'c Cairn, now rules by Stokely Silverstream , cousine of Bruenor. They still remain loyal to Mithral Hall and continue their old ways forging weaspons and mining ore.
The Cairne is filled with young dwarves that are no less gruff or stern than their cousines but also bring a lot more laughter and hospitality to the Cairn. Where it once was several mines is now several carved out rooms with doors and hearths. It's a much more welcoming place.