Near the end of the dungeon there are three similar branches, each has a group of Viamontian Ore Collectors that drop the Shade Iron Ore Hammer, so if you have a large group of people you can split up to avoid waiting. At the end of each branch is a pillar of Shade Iron Ore Deposit. Use the hammer to obtain a Shade Iron Ore Sample to return to Mekhmet in Ayan Baqur. Note that there is a surface portal at the start that can be tied and summoned.