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:

Install Fabric Loader for Minecraft 1.21.1
Download Fabric API for 1.21.1
Place both Fabric API and this mod's .jar file in your .minecraft/mods folder
Launch Minecraft with the Fabric profile
(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.

CobbleOreGenerator

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