Building Overview Technologies Game Strategies History
Smelter upgrades (hotkey: A) increase the production bonus that Smelters add to Metal production.

The second technology line (hotkey: B) improves a number of different things. Every upgrade:

Metallurgy MetalEdit

Metal AlloysEdit


"And all the pins of the tabernacle, and of the court round about, were of brass."

—Exodus (38:20)
  • Smelters increase output of mines in host cities by 100%.
Cost Requirements Leads to
  • 250Timber; 250Food
  • Time to complete: 23.33 seconds (350 frames)
  • S4 Science
  • 310388541f2b80f43dca5471be265ba9 Metal

Cold CastingEdit


A new means of gaining the sheen and glamour of metal, minus the weight and cost of metal — or even the metal itself for that matter.

—Job (5:8)
  • Smelters increase output of Mines in host cities by 150%.
Cost Requirements Leads to
  • 350Timber; 350Food
  • Time to complete: 26.67 seconds (400 frames)
  • Alloys Metal
  • S5 Science
  • Steel Metal


"Not alone for the blade was the bright steel made." — Charles Mackay, 19th century Scottish poet
  • Smelters increase output of Mines in host cities by 200%.
Cost Requirements Leads to
  • 450Timber; 450Food
  • Time to complete: 30 seconds (450 frames)
  • 310388541f2b80f43dca5471be265ba9 Metal
  • S6 Science