+ 2 max iron workers
Research data
- Research branch
- Iron mine
- Unlock requirement
- Iron mine level 4 · Carpenter level 4
- Cost rank
- 17
- Wood cost
- 20,000
- Stone cost
- 20,000
- Food cost
- 20,000
- Gold cost
- 8,000
- Iron cost
- 12,000
- Effect
- + 2 max iron workers
Improved Work Area IV
+ 2 max iron workers