Demise of Nations – Resource Tiles
There is research that allows you to build farms, lumberyards, and mines on the map and research that allows you to level up those.
RESOURCE TILES
Farms
To build (food: crops, rice, potatoes, grains) Farms, look for grass tiles that look “dirty”, select it, and hit the +. A menu will pop up where you can select the Farm and build it. Once built and having researched it, you may upgrade it to increase the yield capacity (max level is 4).
Mines
To build Mines (iron mine and stone quarry), look for mountain/hill tiles that are “shiny”, select it, and hit the +. A menu will pop up where you can select the Mine and build it. Once built and having researched it, you may upgrade it to increase the yield (max level is 2).
Lumberyards
To build (lumber) Lumberyards, look for forest tiles that look like they have been visited by a “lumberjack”, select it, and hit the +. A menu will pop up where you can select the Lumberyard and build it. Once built and having researched it, you may upgrade it to increase the yield (max level is 2).