Custom Ore in certain Biome.

The Code if you need it:

package mod.mcreator;

import net.minecraftforge.fml.relauncher.SideOnly;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.common.registry.ForgeRegistries;
import net.minecraftforge.fml.common.event.FMLServerStartingEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;

import net.minecraft.world.gen.feature.WorldGenMinable;
import net.minecraft.world.World;
import net.minecraft.world.IBlockAccess;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.BlockRenderLayer;
import net.minecraft.item.ItemStack;
import net.minecraft.item.ItemBlock;
import net.minecraft.item.Item;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.client.Minecraft;
import net.minecraft.block.state.IBlockState;
import net.minecraft.block.material.Material;
import net.minecraft.block.SoundType;
import net.minecraft.block.Block;

import java.util.Random;

public class mcreator_desertoore {

    public mcreator_desertoore() {
    }

    public static BlockDesertoore block;
    public static Item item;
    public static Object instance;

    public int addFuel(ItemStack fuel) {
        return 0;
    }

    public void serverLoad(FMLServerStartingEvent event) {
    }

    public void preInit(FMLPreInitializationEvent event) {
        block.setRegistryName("desertoore");
        ForgeRegistries.BLOCKS.register(block);
        item = new ItemBlock(block).setRegistryName(block.getRegistryName());
        ForgeRegistries.ITEMS.register(item);
    }

    public void registerRenderers() {
    }

    public void load(FMLInitializationEvent event) {
        if (event.getSide() == Side.CLIENT) {
            Minecraft.getMinecraft().getRenderItem().getItemModelMesher()
                    .register(item, 0, new ModelResourceLocation("testenvironmentmod:desertoore", "inventory"));
        }
    }

    static {
        block = (BlockDesertoore) (new BlockDesertoore().setHardness(5.0F).setResistance(10.0F).setLightLevel(0.0F).setUnlocalizedName("desertoore")
                .setLightOpacity(0).setCreativeTab(CreativeTabs.BUILDING_BLOCKS));
        block.setHarvestLevel("pickaxe", 6);
    }

    public void generateSurface(World world, java.util.Random rand, int chunkX, int chunkZ) {
        for (int i = 0; i < 10; i++) {
            int randPosX = chunkX + rand.nextInt(16);
            int randPosY = rand.nextInt(79) + 16;
            int randPosZ = chunkZ + rand.nextInt(16);
            (new WorldGenMinable(mcreator_desertoore.block.getDefaultState(), 15)).generate(world, rand, new BlockPos(randPosX, randPosY, randPosZ));
        }
    }

    public void generateNether(World world, Random random, int chunkX, int chunkZ) {
    }

    static class BlockDesertoore extends Block {

        int a1 = 0, a2 = 0, a3 = 0, a4 = 0, a5 = 0, a6 = 0;
        boolean red = false;

        protected BlockDesertoore() {
            super(Material.ROCK);
            setSoundType(SoundType.STONE);
        }

        @Override
        public void onBlockAdded(World world, BlockPos pos, IBlockState state) {
            int i = pos.getX();
            int j = pos.getY();
            int k = pos.getZ();
            world.scheduleUpdate(new BlockPos(i, j, k), this, this.tickRate(world));
        }

        @Override
        public int getWeakPower(IBlockState blockState, IBlockAccess blockAccess, BlockPos pos, EnumFacing side) {
            return red ? 15 : 0;
        }

        @Override
        public int getStrongPower(IBlockState blockState, IBlockAccess blockAccess, BlockPos pos, EnumFacing side) {
            return red ? 15 : 0;
        }

        @SideOnly(Side.CLIENT)
        @Override
        public BlockRenderLayer getBlockLayer() {
            return BlockRenderLayer.SOLID;
        }

        @Override
        public AxisAlignedBB getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
            return new AxisAlignedBB(0.0D, 0.0D, 0.0D, 1.0D, 1.0D, 1.0D);
        }

        @Override
        public int tickRate(World world) {
            return 10;
        }

        @Override
        public int quantityDropped(Random par1Random) {
            return 1;
        }
    }
}