The dwarves fear the Orcs are preparing to destroy Durin's Stone, which marks the revered place where Durin I first looked into the Mirrormere.
'Durin's Stone is a treasure of the dwarves. It is in that spot, staring into the Mirrormere, that Durin decided to settle here and build Khazad-dûm. The stone serves as an eternal reminder to all dwarves of what is rightfully ours.
'I fear for the safety of Durin's Stone. The Orcs spewing forth from Moria have set up a camp around it, and daily I see several of them working on reducing it to dust. This cannot be allowed to happen.
'Head to Uruk-gashan, south-east of here, and defeat the Orc-sappers around the camp. They are the ones with the knowledge to reduce the stone to dust and are the greatest threat to our ancient monument.'
Orc-sappers can be found at Uruk-gashan, south-east of Mekhem-bizru.
Haflith asked you to go to Uruk-gashan and defeat the Orc-sappers threatening to destroy Durin's Stone.
Haflith is at Mekhem-bizru, north-west of Uruk-gashan.
Haflith will want to know that the Orc-sappers have been defeated, keeping Durin's Stone safe... for now, at least.