As you guys probably know, there are multiple Earth Elemental type mobs (example: Enraged Earth Spirit) that will spawn at least one "mini" version of them after they die. This makes the fight annoying since the mini versions never drop anything, and certainly don't help for mana/hp/time conservation when farming primals.
What you may not know is that the "mini" elementals will disappear if you enter combat with them and then leave combat. Probably the quickest repeatable way to do this is to simply mount up on a flying mount, run up to them until they aggro, and then hover a couple feet off the ground and they will disappear in about two seconds. It makes farming the elementals pretty easy.
Note that they will aggro if you get close to them when they spawn, so you have to kill the normal elemental from a ranged distance for this to work; else you'd have to use some ability to get you out of combat such as Vanish.