Cool, so randomly looking on the ground is the way to go for the other 2 countries?
Some adventures in Egypt and France can give you the map tags of valuable metals, too, just not as many. In the MorbuCorp adventure-chain in Egypt, you get the mission of finding Mummitomium and you can keep the adventure for as long as you want to be able to see the Mummitomium spawns on the map. Be aware that this one is a one time adventure, but you can record the spawn spots and keep checking back to them.
If you need Copper, just check the island with the ruins in Egypt. There's a medium-sized tomb there with masses of Copper, and you can also find it on the ground there.
In France there's also an adventure to find Titanium. That one can be done an infinite amount of times and it always pops up on the adventure board for me when I'm done with all the big adventures in France.
There's possibly more than that but that's all I know. Randomly looking on the ground works too, of course, and I find it lots of fun to have my sim run all over and camp in random places during her vacation.