When you visit the mine and look up just after you have passed the forcefield to the outer area you can see dilithium appearing out of thin air and floating into the mine. (alternatively just stand outside the mine, face the entrance and you'll see it on the top right corner of the "door").
Can this please be fixed? I know it's nothing "gamebreaking" etc. but it looks irritating and out of place. On top of that there's a 200k (17$) investment in it.