Romimoco-Ores is a mini mod to simplify adding custom ores to minecraft. There are two types of ores that can be added to the game, Ores and Gems.

Wiki (In Progress)

Ores:

Drops itself when mined
Smelts into an ingot
Variants smelt into variant ingots
Will generate Ore, Ingots, Block, Tools, Armor, Dusts (based on config entries)

Gems ( >= v0.2.0)

Drops an Item when mined
Unsmeltable (currently)
Drops can be custom defined or a string such as "minecraft:diamond"
Will generate Ore, Drops (if custom defined)
If the Drop type is "gem", Tools, Armor, and Blocks will be generated.
Custom Drops can have a BurnTime, which is the number of ticks they will burn in a furnace for.
The "cut" of a custom drop will define what it looks like. Options are ball, chunk1, chunk2, crystal, rhomboid, round, square, teardrop, and trilliant.

To generate these blocks and items, simply create an oreDefinitions.json in your config/Romimoco/ores directory.

An oreDefinitions.json looks like this:

{
  "OreList": [
    {
      "Name" : "iron",
      "Color": "0xF3D1BB",
      "Hardness":"3",
      "Harvestlevel":"2",
      "Generation":{
        "MinY": 5,
        "MaxY": 67,
        "SpawnChance": 5,
        "VeinSize": 12
      },
      "ItemStats": {
        "Efficiency": 10.0,
        "Damage": 2,
        "ArmorClass": 1,
        "Toughness": 0,
        "Enchantability": 9,
        "DurabilityMod": 15
      }
    },
    {
      "Name" : "gold",
      "Color": "0xFFEE00",
      "Hardness":"2",
      "Harvestlevel":"2",
      "Generation":{
        "MinY": 5,
        "MaxY": 34,
        "SpawnChance": 3,
        "VeinSize": 8
      },
      "ItemStats": {
        "Efficiency": 8.0,
        "Damage": 3,
        "ArmorClass": 1,
        "Toughness": 2,
        "Enchantability": 10,
        "DurabilityMod": 7
      }
    }
  ],
  "GemList":[
    {
      "Name" : "diamond",
      "Color": "0x1589ff",
      "Hardness":"4.5",
      "Harvestlevel":"3",
      "Drops":"minecraft:diamond",
      "Generation":{
        "Rarities":{
          "Poor":50,
          "Low":25,
          "Moderate":10,
          "High":10,
          "Rich":5
        },
        "MinY": 5,
        "MaxY": 16,
        "SpawnChance": 5,
        "VeinSize": 8
      },
      "ItemStats": {
        "Efficiency": 12.0,
        "Damage": 0,
        "ArmorClass": 1,
        "Toughness": 0,
        "Enchantability": 10,
        "DurabilityMod": 33
      }
    },
    {
      "Name" : "emerald",
      "Color": "0x00FF00",
      "Hardness":"4.5",
      "Harvestlevel":"3",
      "Drops":"minecraft:emerald",
      "Generation":{
        "MinY": 5,
        "MaxY": 32,
        "SpawnChance": 5,
        "VeinSize": 4,
        "Biomes": [
          "extreme_hills",
          "smaller_extreme_hills",
          "extreme_hills_with_trees",
          "mutated_extreme_hills",
          "mutated_extreme_hills_with_trees"
        ]
      }
    },
    {
      "Name" : "coal",
      "Color": "0x000000",
      "Hardness":"1",
      "Harvestlevel":"1",
      "Drops":"minecraft:coal",
      "Generation":{
        "MinY": 5,
        "MaxY": 132,
        "SpawnChance": 5,
        "VeinSize": 24
      }
    },
    {
      "Name" : "lapis",
      "Color": "0x0000FF",
      "Hardness":"3",
      "Harvestlevel":"2",
      "Drops":"minecraft:dye/4",
      "Generation":{
        "MinY": 14,
        "MaxY": 34,
        "SpawnChance": 5,
        "VeinSize": 12
      }
    },
    {
      "Name": "redstone",
      "Color": "0xFF0000",
      "Hardness": "3",
      "Harvestlevel": "3",
      "Drops": "minecraft:redstone",
      "Generation": {
        "MinY": 5,
        "MaxY": 16,
        "SpawnChance": 5,
        "VeinSize": 12
      }
    },
    {
      "Name" : "ruby",
      "Color": "0xff0000",
      "Hardness":"2.2",
      "Harvestlevel":"4",
      "Drops":{
        "Type":"gem",
        "Cut":"round"
      }
    }
  ]
}

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