Cannot find artifact even though I'm right there

[Minas]

Played my first few hours and did the tutorial. I have discovered 2 artifacts on the first map and my detector is green and bleeping like mad, but no matter what angle I point, I cannot find it.

More info as spoiler of what locations I mean:
So one of them is in the military base for the second mission (film), there is broken down house with a static black mimic and it seems the artifact is right where the mimic is, but it won't show up when I light up the detector. Same thing in the small house with the sentry spot on top (usually a policeman there). In that house, lower floor there's another static mimic, but I cannot find an artifact.

Is there a trick to this? I think I'm missing out on some cash.

[Shy]

You have to kill the static mimic and it should drop the artifact you're looking for.

Assuming you've killed it, it may have fallen through terrain, so try a tele grab where you think it is?

[Minas]

I didn't think to shoot at it... thanks!

[D Scriptus]

Are you talking about rifrs or broken rifts?
Either way, yeah - you can melee them to save ammo and stay quiet. And if you're quick you can grab the artifact before it falls into the floor. I've had occasions where the rift shards have vanished, that was beta - it should be fixed now, but who knows.