Sub Surface Mining

Knowledge to mine in sub surface.

Name	Costs
Sub Surface Mining	1400 1200 1200 1000	0	01d09h20m

Ability
Provides	Requires
+5% Resource production workforce - Clay to user +5% Resource production workforce - Iron to user Sub Surface Mining technology	User has not Sub Surface Mining technology Building is Guild House

City Buildings to research
Name	Construction Costs			Gold Production	Culture Points	Trade Points
Guild House	2200 2300 1850 2000 1400	0	08d16h20m	0	40	20

Sub Surface Mining techtree