CobbleOreGenerator

CobbleOre Generator – Fabric 1.21.1

A Minecraft Fabric mod for version 1.21.1 that makes cobblestone generators generate ores! Based on the original mod by OffsetMods538.

Features

• 25% Chance for Ores: When cobblestone is generated, there’s a 25% chance it becomes an ore instead
• Fully Configurable: JSON config file lets you control which blocks spawn and their weights
• Modded Support: Works with any mod that adds ores – just add them to the config!
• Balanced by Default: Comes with sensible default weights for all vanilla ores

How It Works

When lava and water interact to create cobblestone in a generator, this mod has a 25% chance to replace that cobblestone with a random ore based on weighted probabilities defined in your config file.

Configuration

The config file is located at .minecraft/config/cog.json

Default Configuration

The mod comes with these default ore weights:

| Ore | Weight | Rarity |
|—–|——–|——–|
| Coal (both variants) | 30 each | Common |
| Iron (both variants) | 25 each | Common |
| Copper (both variants) | 20 each | Common |
| Redstone (both variants) | 15 each | Uncommon |
| Lapis (both variants) | 12 each | Uncommon |
| Gold (both variants) | 10 each | Uncommon |
| Diamond (both variants) | 3 each | Rare |
| Emerald (both variants) | 2 each | Very Rare |

Config Format

The config uses a simple weight-based system. Higher weight = more common.

{
  "generatableBlocks": {
    "minecraft:cobblestone": 30,
    "minecraft:diamond_ore": 3,
    "minecraft:emerald_ore": 2
  }
}

Weight Examples:

• 2 blocks with weight 1 each = 50/50 chance
• Block A with weight 30, Block B with weight 1 = ~97% vs ~3%

Adding Modded Ores

Just add the block ID and weight to the config:

{
  "generatableBlocks": {
    "minecraft:diamond_ore": 3,
    "create:zinc_ore": 15,
    "thermal:silver_ore": 10,
    "mekanism:osmium_ore": 12
  }
}

Fun Configurations

Chaos Mode – Generate ANY block:

{
  "generatableBlocks": {
    "minecraft:diamond_block": 1,
    "minecraft:tnt": 1,
    "minecraft:cake": 10
  }
}

Easy Mode – More valuable ores:

{
  "generatableBlocks": {
    "minecraft:diamond_ore": 30,
    "minecraft:emerald_ore": 20,
    "minecraft:gold_ore": 50
  }
}

Installation

For Players:

1. Install Fabric Loader for Minecraft 1.21.1
2. Download Fabric API for 1.21.1
3. Place both Fabric API and this mod’s .jar file in your .minecraft/mods folder
4. Launch Minecraft with the Fabric profile
5. (Optional) Edit the config at .minecraft/config/cog.json

For Developers:

First Time Setup

Before building, you need to set up the Gradle wrapper:

Option 1: Using the download script (easiest)

# Linux/Mac
chmod +x download-wrapper.sh
./download-wrapper.sh

# Windows
download-wrapper.bat

Option 2: If you have Gradle installed

gradle wrapper

Option 3: Manual download
Download gradle-wrapper.jar from:
https://raw.githubusercontent.com/gradle/gradle/v8.8.0/gradle/wrapper/gradle-wrapper.jar

Place it in: gradle/wrapper/gradle-wrapper.jar

Building the Mod

Once the wrapper is set up:

# Linux/Mac
./gradlew build

# Windows
gradlew.bat build

The compiled .jar file will be located in build/libs/

Requirements

• Minecraft 1.21.1
• Fabric Loader 0.16.0 or higher
• Fabric API 0.102.0+1.21.1 or higher
• Java 21 or higher

Compatibility

This mod should be compatible with most other mods. It only modifies the cobblestone generation behavior and uses mixins to hook into fluid interactions.

FAQ

Q: Does this work with modded ores?
A: Yes! Just add them to the config file with their block ID and desired weight.

Q: Can I make it generate blocks other than ores?
A: Absolutely! You can use any block ID in the config. Want cake generators? Go for it!

Q: The ores aren’t generating!
A: Make sure you have a proper cobblestone generator (lava + water creating cobblestone). Stone generators won’t work. Also remember it’s only a 25% chance.

Q: Can I change the 25% chance?
A: The percentage is hardcoded in the mod, but you can adjust the relative frequencies using weights in the config.

Q: Will this work on servers?
A: Yes! Just install it on the server like any other Fabric mod.

Credits

• Original concept and mod by OffsetMods538
• Adapted for Minecraft 1.21.1

License

This mod is available under the MIT license.

Links

• Original mod: https://github.com/OffsetMods538/CobbleOre-Generator
• Original Modrinth page: https://modrinth.com/mod/cog