Ore Generation has changed. You still get Iron in the desert, and copper/gold in the mountains. However the large veins are removed. Now there are layers with concentrated ore, but its mixed with stone instead of being large pure veins.
External link →Isn't map gen configured via a text file? Could servers like Ecoville simply be using an old mapgen config file? OP might have generated it locally from a fresh install.
That would be the cause, otherwise its impossible to get the old generation.
Oh so this was an intentional change from the 9.x style of ore generation?
Update 10 itself changed ore generation from large clusters not well distributed into better distributed vain form, it was mentioned in the release notes.
devtrackers.gg
