Coal Mine

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Coal Mine

Building

Type	Resource
Max Level	30
Prerequisite	Furnace Lv. 3
Function	Produces Coal

The Coal Mine produces Coal in your city. Upgrading it increases Coal output. It unlocks when the Furnace reaches Level 3. It is the third production building a player opens, after the Sawmill and the Hunter's Hut and before the Iron Mine.

Production

The Coal Mine produces nothing until Survivors are assigned to its workstations; six can be assigned to it.

Six pieces of furniture can be built inside: a Sorting Station, a Pulverizer, a Changing Room, a Pump, a Shower Room and a Steam Engine. Upgrading them raises output, shortens production time and adds building power. The hero Charlie adds up to 25% city Coal output, and the Edicts of the Chief's House act on every worksite at once.

Coal produced by the city counts as secured and cannot be plundered. Coal gathered on the world map or taken from another base is not secured. Protection is not equal between resources either: a level 15 Storehouse shields 3.2M Meat and Wood but only 640,000 Coal — a fifth as much.

Coal is spent on upgrading buildings, conducting Research and training troops.

Progression

The Coal Mine is unlocked by Furnace level 3, and its first three levels all keep that same prerequisite. From level 4 onward each level requires the Furnace at the identical level.

The relationship runs both ways: Furnace level 4 requires Coal Mine level 3, and it is the first Furnace upgrade whose cost includes Coal.

Costs, construction times and building power are identical, level for level, to those of the Sawmill, the Hunter's Hut and the Iron Mine. The Coal Mine ends at level 30 and has no Fire Crystal levels.

Levels

Upgrade cost, time and power per level (resource costs from official data, shown abbreviated).

Coal Mine — Levels
Level	Meat	Wood	Coal	Iron	Time	Power
1	—	30	—	—	2s	40
2	—	45	—	—	3s	76
3	—	200	—	—	10s	130
4	—	450	90	—	35s	202
5	—	1.9k	380	—	1m 10s	310
6	—	4.8k	960	240	2m 20s	472
7	—	17k	3.4k	865	4m 45s	706
8	—	31k	6.3k	1.5k	7m 10s	940
9	—	65k	13k	3.2k	10m 30s	1,174
10	—	110k	23k	5.7k	14m	1,514
11	110k	110k	23k	5.9k	18m	1,854
12	150k	150k	30k	7.5k	21m 30s	2,194
13	210k	210k	42k	10k	26m	2,768
14	280k	280k	56k	14k	33m 30s	3,342
15	410k	410k	83k	20k	43m	3,916
16	530k	530k	100k	26k	1h 13m	4,724
17	830k	830k	160k	41k	1h 27m 30s	5,532
18	1.1M	1.1M	220K	56K	1h 45m	6,340
19	1.4M	1.4M	280K	70K	2h 38m	7,488
20	1.9M	1.9M	380K	96K	3h 17m 30s	8,636
21	2.4M	2.4M	490K	120K	4h 16m 30s	9,784
22	3.2M	3.2M	640K	160K	6h 25m	11,506
23	4M	4M	800K	200K	8h 59m	13,228
24	5.4M	5.4M	1M	270K	12h 34m 30s	14,950
25	7.3M	7.3M	1.4M	360K	17h 36m 30s	16,672
26	9.4M	9.4M	1.8M	470K	20h 15m	19,202
27	13M	13M	2.6M	670K	1d 18m	21,732
28	17M	17M	3.5M	890K	1d 3h 57m	24,262
29	22M	22M	4.4M	1.1M	1d 8h 8m	26,792
30	27M	27M	5.4M	1.3M	1d 14h 34m	30,470

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Production

Progression

Levels

See also