First let me note that I had absolutely NO idea that caterium, sulfur, and quartz were ores I had to MAM research, as the game appeared to be directing me to find ores as needed I opted to not harvest the caterium or sulfur I'd been finding since inventory space is too limited to pick up ores I thought I didn't need yet.
Then I looked up the lizard doggo on the wiki, and happened to wander to a page telling me that I had to research caterium in the MAM to unlock its uses.....
I spent one or two hours trying to find Caterium and Sulfur deposits so that I could research them and find their nodes. I didn't even know Quartz existed until I unlocked trains and decided it was time to visit the wiki and see why I had a UI function slot empty in the bottom-right of my screen.
It took me 4 hours to find Quartz. After finding a SAM node AND a SAM deposit on opposite ends of the map, I got so frustrated with my search for quartz that ultimately I ended up looking up directions online.
I would describe searching for these three ores as being very needle-in-a-haystack-like, there's far too much ground to cover to find these ores unless you get lucky, and unless you visit the wiki you currently have little to no indication that they even exist unless you stumble on the ores, then you have no way of knowing they need to be put into the MAM.
Here's my suggestion: The developers need to decide an appropriate tier where the player should have access to these ores by the end of that tier's primary milestones. If the player completes most of those primary milestones and hasn't researched those ores yet, ADA should announce the detection of those ores in the player's map-area, and enable the player to use an object scanner to find deposits of that ore (but not nodes).
The object scanner would still make finding those ore deposits suitably challenging in my opinion, but it probably won't take the player an hour to find their first deposit of the three (or perhaps more later on) researched ores.