Uranium represents a critical resource for city progression beyond city level 30 (c30). This guide provides comprehensive information on uranium gathering strategies, the Core Mining Station mechanics, and deep mining competitive gameplay.
Useful Calculators
Plan your uranium-dependent upgrades and research your city’s progression path:
- Building Upgrade Calculator - Calculate construction costs and requirements for city buildings beyond level 30
- Uranium Calculator - Plan and breakdown how much uranium you get get with free and on a budget)
What is Uranium?
Uranium is a strategic resource required for building upgrades beyond city level 30. Collection rates are significantly lower than standard resources, creating a sustained progression bottleneck. Uniquely, uranium cannot be traded between players or obtained through city attacks—it must be gathered through designated in-game sources.
Collection Methods:
- Uranium Gobbler
- Doomsday Challenge
- Core Mining Station - Surface Mining
- Core Mining Station - Deep Mining
- Monthly Uranium Card subscription
- Monetary pack purchases
- Limited-time events
Uranium Gobbler
Beginning at city level 28, players unlock uranium tracker fragments through daily quest completion: 2 fragments at 150 quest points and 3 fragments at 360 quest points. Ten fragments combine to create a single tracker. Using a tracker automatically locates a Uranium Gobbler on the map; defeating it consumes the tracker and 10 mobility in exchange for 1,000 uranium. Consistent daily engagement yields approximately 500 uranium daily average.
Doomsday Challenge
At city level 30, the Doomsday Challenge becomes available. This daily challenge operates similarly to Ruin Rally mechanics: players have one attack attempt per day to progress through up to 10 progressively difficult zombie waves. Initial progression typically stalls after a few waves; sustained city development enables progression through all 10 waves. Note: This challenge permits deployment of all available troops simultaneously (comparable to Mother of Doom mechanics). Complete all 10 waves to earn 800 uranium.
Monthly Uranium Card
A subscription service providing 30 days of daily uranium collection. At $19.99 USD per month, it delivers 1,000 uranium daily alongside additional benefits.
What is the Core Mining Station?
The Core Mining Station unlocks at city level 30. It features two distinct operational modes: surface mining and deep mining. Surface mining generates uranium passively at 30 per hour, with maximum capacity of 300 uranium (without subscription) or 360 uranium (with monthly card). This creates an effective collection window of 10-12 hours before capacity is reached. Deep mining mechanics are substantially more complex and require separate analysis.
Core Mining Station - Deep Mining
Deep mining—also referenced as “the uranium mines”—represents the competitive aspect of uranium gathering. This feature permits player-versus-player conflict without incurring casualties: defeated armies generate no permanent losses and require no healing costs.
The deep mining system consists of four distinct mines, each containing multiple levels. Deeper mines offer increased uranium generation rates but feature progressively stronger player populations. Below are current generation rates per hour (also visible in-game):
Mine 1
- Level 1: 30/h
- Level 2: 35/h
- Level 3: 39/h
- Level 4: 45/h
Mine 2
- Level 2: 37/h
- Level 3: 42/h
- Level 4: 48/h
- Level 5: 55/h
Mine 3
- Level 3: 45/h
- Level 4: 51/h
- Level 5: 58/h
- Level 6: 66/h
Mine 4
- Level 4: 54/h
- Level 5: 62/h
- Level 6: 70/h
- Level 7: 80/h
While deeper mines offer faster uranium generation, occupying them presents competitive disadvantages for less-developed cities. Viable strategies exist across all mine levels. Before discussing specific approaches, two core mechanics require explanation: plundering and occupying.
Two interaction modes exist when attacking an occupied mine: plunder and occupy. Plundering yields 15% of the target’s accumulated uranium upon victory. Occupying performs identically but additionally displaces the current occupant and transfers mine control. Both actions result in no losses upon defeat.
Plunder vs. Occupy Strategy: Plundering is appropriate when defending an existing high-yield mine. Occupying is advantageous when a target has accumulated substantial uranium (>500), allowing simultaneous resource capture and strategic position improvement.
Community Etiquette
Established mining protocols maintain positive player relations:
Multiple Attacks: Refrain from repeatedly attacking the same player within short timeframes. Sufficient mine availability exists to engage with distinct opponents at similar competitive levels.
Resource Threshold: Apply the 500 uranium minimum rule—only engage targets with ≥500 accumulated uranium. Lower quantities yield negligible gains while fostering interpersonal conflict.
Gathering Strategies
Strategy 1: Sustainable Collection (Recommended)
Select a mine level that balances generation rate with attack frequency—minimizing displacement while maintaining consistent uranium gain. Initial play typically centers on Mine 1 Level 1; progression advances to higher yields (e.g., Mine 3 Level 4) as competitive ability increases. This approach leverages two daily free attacks (occupying unoccupied mines or engaging other players) to avoid gold expenditure. Optimal execution: Collect uranium and occupy a new mine twice daily (approximately 12 hours apart) to maximize acquisition without attacking other players repeatedly.
Strategy 2: Intensive Farming (High Commitment)
This approach requires the monthly uranium card subscription. Occupy the highest unoccupied mine accessible, then re-occupy every 4 hours (when protection shield expires) to collect generated uranium. This cycle—repeated daily without rest—generates maximum uranium but demands significant time commitment and progressively consumes gold as free attacks deplete (attacks beyond the first two cost up to 500 gold maximum).
Battles
Deep mining combat provides strategic engagement and variety to extended farming periods. Battle outcome prediction requires multiple information layers: displayed Battle Power (BP) and troop count provide initial assessment only. Developing opponent knowledge through experience enables informed target selection and formation adaptation.
Recommended Initial Formation: Allocate 20% front row (shredders, infantry, or tanks), maximum zombies, and 80% back row (cannons, EMPs, or snipers) based on your primary combat role. This allocation balances survivability with damage output.
Formation Variety: Optimal formations vary significantly. Adaptive formations counter opponent strategies; avoid rigid adherence to single configurations. The 1/1/99 formation (minimal front row allocation) is generally ineffective. Prioritize substantial frontline presence in all configurations.
Summary
Uranium becomes essential for city progression beyond level 30. Multiple acquisition methods exist spanning free-to-play options (gobbler collection, doomsday challenges, core mining station) and monetary investments (subscription cards, pack purchases). Since uranium cannot be transferred or obtained through PvP, maximizing free collection before pursuing monetary expenditures represents optimal resource allocation strategy.