Since Dead Space 3 released earlier this week, a number of game “breaking” errors were discovered, but it turns out that some of them were actually intended.
According to Jino Talens (PR Rep at EA), the ability to infinitely farm materials was designed to be part of the game and EA currently has no plans to remove said feature. In addition to that, the message also implied that there might be other infinite item spawns to discover, so make sure to pay close attention to what materials you come across.