This short guide contains few tips that might help you to get tin or copper.
Tips to Get Ore
There are some mines in the map, you can keep exploring the map.
So you can find the mine, such as tin mine.
You can also get ingots from raiding higher level NPC camps.
Note: you can made your bronze tools this way later.
If you’re only getting flint and stone, you might be using too low a pick. I went and hit 2 of the three tin mines last night with a bronze pick and got a whole lot of tin. You can get copper bars (and sometimes tin and bronze) from the chests and breakables in the Flint Tribe Barracks and use that to make your first pick. Happy hunting!