There’s No List of Discovered Resources in Star Systems
In another interview with IGN, Murray mentioned that one of the more reliable ways to find a particular element you were searching for was to use the galactic map. From the galactic map, you’d be able to see the star systems discovered by players and, if they chose to upload their discoveries, you would be able to see a list of elements and resources that could be found there. This isn’t something that made it into the final game either.
Right now, the galactic map in No Man’s Sky tells you what class the star system is, and how many planets and moons can be found in that system. Looking back at my own discovered systems, it’s impossible to tell what resources I’ve managed to mine from there. Heck, even looking at the discovery menu and going to each individual planet on the list doesn’t give you any information about what elements you can find there either. While you can upload your flora and fauna discoveries, there doesn’t seem to be a way to see what elements or minerals are available in a system or a planet.