Iron mine

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

Maximum Level: 30

Level	Requirements	Workers needed for upgrade level/total of workers	Production per hour
1	50 60 40	5 / 5	30
2	63 77 50	1 / 6	35
3	78 98 62	1 / 7	41
4	98 124 77	1 / 8	47
5	122 159 96	1 / 9	55
6	153 202 120	1 / 10	64
7	191 258 149	2 / 12	74
8	238 329 185	2 / 14	86
9	298 419 231	2 / 16	100
10	373 534 287	2 / 18	117
11	466 681 358	3 / 21	136
12	582 868 446	3 / 24	158
13	728 1107 555	4 / 28	184
14	909 1412 691	5 / 33	214
15	1137 1800 860	5 / 38	249
16	1421 2295 1071	5 / 43	289
17	1776 2926 1333	7 / 50	337
18	2220 3731 1659	8 / 58	391
19	2776 4757 2066	9 / 67	455
20	3469 6065 2572	10 / 77	530
21	4337 7733 3202	12 / 89	616
22	5421 9860 3987	14 / 103	717
23	6776 12571 4963	16 / 119	833
24	8470 16028 6180	19 / 138	969
25	10588 20436 7694	21 / 159	1127
26	13235 26056 9578	24 / 183	1311
27	16544 33221 11925	29 / 212	1525
28	20680 42357 14847	33 / 245	1774
29	25849 54005 18484	38 / 283	2063
30	32312 68857 23013	43 / 326	2400