Materials you can expect to gather from rss tiling:
Farm tiles: Wood – Rope – Leather
Stone tiles: Lead – Glass – Gunpowder
Oil tiles: Rubber – Schematics – Polyester- Aluminum
Metal tiles: Steel – Carbon Fiber – Titanium
Coin Tiles: Aluminum – Steel – Titanium – Schematics – Rope – Leather – Gun Powder
It’s quite easy to see that the most materials exists several places. There are some exceptions like Carbon Fiber and Glass, and the best tile-type to hunt for materials is Coin tiles.
These tiles are close to water, so as a small conclusion, search for water close by your base if you need materials.