Coal

Coal is one of the four primary Resources in Whiteout Survival. It is an energy resource critical for powering the Furnace and is also required for building upgrades, research, and high-tier troop training.

Overview

Coal has a dual role in Whiteout Survival: it is both consumed as fuel for the Furnace (to generate heat and keep Survivors alive) and used as a construction and training material. This dual demand makes Coal one of the most valuable and sought-after resources in the game.

Production

Coal is produced by:

• Coal Mines — City buildings that produce Coal passively over time
• Production rate increases with building level, Economy Research bonuses, and development hero skills

Gathering

Coal can also be gathered from coal deposit tiles on the world map:

• Send troops to coal deposits on the map
• Higher-capacity gathering troops collect more Coal per march
• Gathering speed and capacity improved through Economy Research and hero skills

Uses

Furnace Fuel

Coal is consumed by the Furnace to:

• Generate heat that keeps Survivors warm
• Prevent Survivors from falling sick during snowstorms
• Power city operations generally

Maintaining adequate Coal supply for the Furnace is essential at all times. Running out of Coal can cause your Survivors to fall ill and stop working.

Construction

Coal is required for:

• Building upgrades (especially at mid-to-high levels)
• Research projects

Troop Training

Coal is required for training mid-to-high tier troops:

• T6+ troops require Coal as a training material
• Higher tier troops require progressively more Coal per unit

Protection

Coal stored in your city can be plundered by enemy attackers. The Storehouse protects a fixed amount of Coal. Resources above this limit are at risk.

Tips

• Never let your Coal supply run critically low — Furnace fuel is the #1 priority use for Coal
• Upgrade Coal mines alongside other production buildings
• Gather Coal from map tiles regularly to supplement city production
• Coal is particularly valuable in high-furnace-level cities — prioritize its production
• Balance Coal with other resources to avoid bottlenecks in construction or training

See Also

• Resources — Overview of all four resource types
• Furnace — The primary consumer of Coal for heat production
• Storehouse — Resource protection building
• Wood — Another construction resource
• Iron — Advanced construction material
• Meat — Primary food resource