CoalGov is a server-side Paper/Bukkit plugin for vanilla Minecraft clients. It adds a small coal-backed economy, land classes, claims, mining permits, protected government land, and coal ore mining restrictions.

The ledger uses Coal Cents for sub-coal transactions: 100cc equals 1 coal. Commands that accept money still treat plain numbers as coal, so 2.5, 2.50, and 250cc all mean 2 coal 50cc.

Build

./gradlew build

The jar is written to build/libs/CoalGov-*.jar.

VPS Install

Build with ./gradlew build.
Copy build/libs/CoalGov-*.jar to /path/to/server/plugins/.
Restart the Paper server.
Edit plugins/CoalGov/config.yml.
Run /coalgov admin reload.

This is a Paper/Bukkit plugin only. It does not require Forge, Fabric, resource packs, client mods, or custom launchers.

Commands

/coal balance
/coal deposit
/coal withdraw <amount>; withdrawals must be whole coal because they create coal items
/coal pay <player> <amount>; accepts coal decimals or cc
/coal fines [list|pay <id|all>]
/market
/claim wand
/claim buy <homestead|industrial> <radius>
/claim buy <homestead|industrial> after selecting a polygon with /claim wand
/claim info
/claim list
/claim show <id>
/claim appraise [id]
/claim sell [id]
/claim transfer <id> <player>
/claim abandon <id>
/permit buy mining <regionName>
/permit list
/diviningrod
/land info
/land create <name> <landClass> <radius>
/land delete <name>
/land list
/coalgov admin balance <player>
/coalgov admin grant <player> <amount>
/coalgov admin take <player> <amount>
/coalgov admin reload
/coalgov admin bypass <on|off|status>
/coalgov admin rod
/coalgov admin treasury <balance|grant <player> <amount>>
/coalgov admin tax exempt <player> <on|off|status>
/police fine <player> <amount> <reason>
/cgnpc zone create <name>
/cgnpc create <trader|worker> <name> <zone>
/cgnpc stock <id> <material> <amount>
/cgnpc funds <id> <amount>
/cgnpc haggle <id> <buy|sell> <material> <amount> <offer>

Super Furnace

Craft a CoalGov Super Furnace with a furnace in the center and stone in the eight surrounding slots. Placed super furnaces are persisted in SQLite, smelt 5x as fast, and burn fuel 4x faster.

Permissions

coalgov.admin: admin commands, default op. Gameplay bypass is available with /coalgov admin bypass on.
coalgov.coal: coal economy commands, default true
coalgov.claim: claim commands, default true
coalgov.permit: permit commands, default true
coalgov.land.info: land info commands, default true
coalgov.market: market trading, default true
coalgov.diviningrod: divining rod command, default true
coalgov.police: police fine commands, default op

Claim Wand

Run /claim wand to receive a CoalGov claim wand. Right-click blocks to add polygon points. Once at least three points are selected, /claim buy homestead or /claim buy industrial buys the polygon instead of a radius claim. Sneak right-click with the wand to clear the current polygon. The plugin shows temporary particles between points and client-side gold marker block previews while selecting, and permanent protected marker blocks are placed at claim vertices after purchase.

Market

/market opens a vanilla inventory menu. Players can sell configured resources to the Ministry or buy from Ministry stock. A normal click buys 1 item, and shift-click buys 64. Prices are dynamic: each material has a base price, but the live price rises when market stock is low and falls when stock is high. Buying and selling use Coal Cents internally, so cheap blocks like cobblestone can transact below 1 coal without forcing bulk purchases. Selling resources increases stock; buying resources decreases stock. Bulk sales are priced against simulated rising stock so one large sale cannot receive the first scarce-stock quote for every item. Coal-equivalent materials keep a floor based on direct coal value, charcoal conversion, or fuel value; arbitrary/generated resources like cobblestone have no forced 1-coal floor. The stock is persisted in SQLite.

Example Config

economy:
  starting_balance: 0
  deposit_coal: true
  deposit_coal_blocks: true

claims:
  homestead:
    base_cost: 32
    cost_per_block: 0.05
    max_radius: 45
    first_claim:
      free: true
      max_radius: 12
  industrial:
    base_cost: 128
    cost_per_block: 0.15
    max_radius: 96

permits:
  mining:
    cost: 64
    duration_hours: 72

market:
  dynamic:
    initial_stock: 1024
    target_stock: 1024
    min_multiplier: 0.35
    max_multiplier: 3.0
    sell_multiplier: 0.85
    buy_multiplier: 1.15
  prices:
    DIRT: 0.01
    COBBLESTONE: 0.02
    SAND: 0.05
    GRAVEL: 0.04
    OAK_LOG: 0.25
    SPRUCE_LOG: 0.25
    BIRCH_LOG: 0.25
    TORCH: 0.10
    COAL: 1.0
    COAL_BLOCK: 9.0
    RAW_COPPER: 0.5
    COPPER_INGOT: 1.0
    RAW_IRON: 1.0
    IRON_INGOT: 2.0
    RAW_GOLD: 2.0
    GOLD_INGOT: 4.0
    DIAMOND: 32.0
    EMERALD: 12.0

land:
  default_land_class: FREEHOLD
  deny_mining_in_government: true
  deny_mining_in_protected_preserve: true
  deny_mining_in_border_zone: true

spawn:
  protection_radius: 32
  guide:
    create_government_region: true
    lines:
      - "COALGOV BASIN"
      - "Free first"
      - "homestead:"
      - "/claim buy"
      - "Use /claim wand"
      - "for polygons"
      - "Coal seams:"
      - "redwood ridges"
      - "Permits:"
      - "/permit buy"
      - "mining <region>"
      - "/market trades"

messages:
  prefix: "&8[&6CoalGov&8]&r "

Manual Test Checklist

Server starts without errors.
Database file is created at plugins/CoalGov/coalgov.db.
Player joining creates a players row.
/coal balance works.
/coal deposit removes coal from inventory and increases balance by 100cc per coal item.
/coal withdraw decreases balance and gives coal items for whole-coal amounts.
/coal pay transfers whole coal, decimal coal, and cc amounts.
/market opens a vanilla inventory trading menu.
Selling resources through /market increases market stock.
Buying resources through /market decreases market stock and changes future prices.
/land create creates a region.
/land info reports current land class.
/claim buy creates a claim and charges coal.
/claim appraise appraises the claim you are standing in.
/claim sell sells the claim you are standing in back to the government at appraised value.
/claim show <id> displays a temporary particle outline.
/claim wand draws a temporary polygon with particles and marker block previews.
/claim buy homestead after wand selection creates a polygon claim.
Claim corners are marked with protected gold blocks.
Unclaimed land is protected from normal block placement and breaking.
Overlapping claims are rejected.
Mining coal in PROTECTED_PRESERVE is denied.
Mining coal in MINING_CONCESSION without permit is denied.
Buying a mining permit allows mining coal in that concession.
Admin permission alone does not bypass gameplay restrictions.
/coalgov admin bypass on bypasses build, mining, and marker restrictions for that admin session.