/c for y=-2,2 do for x=-2,2 do game.surfaces.nauvis.create_entity({name="uranium-ore",amount=5000,position={game.player.position.x+x,game.player.position.y+y}}) end end

press ` in the game and enter this console. uranium ore will be spawned on the ground you stand with the size of 5x5.

Doesnt work, gives an error unknown entity name

Works for me FYI.

Since the map is generated as you explore it, if you add this mod to an existing game then explore several chunks beyond your current map edges, you should (eventually) find uranium.

EDIT: Tested successfully. I loaded a game which was started without Nucular, and ran into the wilderness. Found uranium about 5-6 chunks out. Also found it elsewhere using radars, which I had not yet built on that map.