North West Cache Cave Bug

So I was doing the north west cave, I found the artifact but couldn't find the loot cache. I finally found it after hitting K and Zooming out, i took some screen shots to show.The cache is hidden in the wall, maybe there is another path that leads into the wall but I'm unsure, I've cleared it multiple times mining all ore but never found a path that leads into the center of a wall.ThanksThis picture shows what looking at the wall is normally, The yellow dots are from the cache that appear and disappear random as they are pulled towards it.