Iron mine

In the iron mine your workers dig the war-crucial iron. The higher its level the more iron is produced.

Note that the production per hour is affected by World Speed. For example, if you're playing a world with 2x speed then the production per hour will be double the values listed in the table.

Maximum Level: 30

Level	Requirements	Workers needed for upgrade level/total of workers	Production per hour
1	75 65 70	10 / 10	30
2	94 83 87	2 / 12	35
3	118 106 108	2 / 14	41
4	147 135 133	2 / 16	47
5	184 172 165	3 / 19	55
6	231 219 205	3 / 22	64
7	289 279 254	4 / 26	74
8	362 356 316	4 / 30	86
9	453 454 391	5 / 35	100
10	567 579 485	6 / 41	117
11	710 738 602	7 / 48	136
12	889 941 746	8 / 56	158
13	1.113 1.200 925	10 / 66	184
14	1.393 1.529 1.147	11 / 77	214
15	1.744 1.950 1.422	13 / 90	249
16	2.183 2.486 1.764	15 / 105	289
17	2.734 3.170 2.187	18 / 123	337
18	3.422 4.042 2.712	21 / 144	391
19	4.285 5.153 3.363	25 / 169	455
20	5.365 6.571 4.170	28 / 197	530
21	6.717 8.378 5.170	34 / 231	616
22	8.409 10.681 6.411	39 / 270	717
23	10.528 13.619 7.950	46 / 316	833
24	13.181 17.364 9.858	54 / 370	969
25	16.503 22.139 12.224	63 / 433	1127
26	20.662 28.227 15.158	74 / 507	1311
27	25.869 35.990 18.796	86 / 593	1525
28	32.388 45.887 23.307	100 / 693	1774
29	40.549 58.506 28.900	118 / 811	2063
30	50.768 74.595 35.837	138 / 949	2400