Hey Fuzzzie - if this helps:
There are 5 copper ores (1334-ic2, 1395-Mtec, 1581:3-Tinker's, and 1702:1-Mystcraft).
There are also 4 tin ores (1335, 1399, 1581:4, and 1702:2 - same mods as above)
Now I said 5 copper ores and only listed 4: The 5th is 1904-Galacticraft; but I'm not sure that one generates in the world - it might be 'moon' only; but I'm not sure.
I didn't notice any other duplicate ores - hope that helps you out
We decided to reroll the server after you make the tweaks to ores - and I wanted you concentrating on Twilight Forest.
Seriously tho, hope that helps you out. Mtec seems to generate the biggest amount of copper/tin.
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As a side note: I'm really curious why Mojang hasn't just create a shitload of ores - and then told mod developers to stop creating custom ores to prevent stuff like this.