explore the ruins, find the artifact - you need to reach the nearest ruins, there will be a marker. Step on the marker, and a battle will begin. After the battle, you will receive the artifact. Take it to the quest giver.

regarding the caravan and ore - if you look closely, there are small stones scattered on the road next to the caravan; you need to walk a little down and to the left along the road, and in the bushes, there will be a stack of bone crushers. They are well hidden by trees, so it will be easier to rotate the camera slightly and look for them. And yes, it's better to complete the quests.