I created a missing-ore.json file in my config/cofh/world folder with the following contents. Just set "B:RetroactiveOreGeneration=true" in CoFHCore.cfg to add missing zinc and copper to your existing world.
Code:
{
"copper": {
"template": "uniform",
"block": {
"name": "ThermalFoundation:Ore",
"metadata": 0
},
"clusterSize": 12,
"numClusters": 6,
"minHeight": 40,
"maxHeight": 75,
"retrogen": "true",
"biomeRestriction": "none",
"biomes": [
"all"
],
"dimensionRestriction": "blacklist",
"dimensions": [
-1,
1
]
},
"Zinc": {
"template": "uniform",
"block": {
"name": "Steamcraft:steamcraftOre",
"metadata": 1
},
"clusterSize": 6,
"numClusters": 4,
"minHeight": 20,
"maxHeight": 55,
"retrogen": "true",
"biomeRestriction": "none",
"biomes": [
"all"
],
"dimensionRestriction": "blacklist",
"dimensions": [
-1,
1
]
}
}