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A resource is a special commodity which typically gives bonus production to its tile, and also gives bonuses to all cities which have access to it. A resource on the map is called a tile resource if the context is unclear. A resource that a civilization has access to is just called a "resource"; unfortunately, there is no widely used term to disambiguate this usage from "tile resource." For the purposes of the wiki, we refer to tradeable resources as trade resources.

Seeing Resources[]

Tile resources are shown on the main map using their own graphics. You can also turn on resource bubbles to more clearly locate them. Some tile resources will not be revealed on the map until particular technologies are known; for example, Horses Horse (Civ4).png are not revealed until a civilization knows the Animal Husbandry tech.

The trade resources that each particular City has access to are shown on the upper right portion of the city screen in iconic form, along with the effect that the resource has in that city. Strategic resources have no direct effect; some of them allow the building of particular military units, while others offer a production bonus to the construction of some buildings or wonders. Luxury and food resources will give one or two points of happiness or health.

Accessing Resources[]

There are several means to gain access to a trade resource. These are reviewed in this section.

Via Tile Development[]

The fundamental way one gets most trade resources is to "enable" the resource with an appropriate technology, and then to "unlock" a tile resource by building its particular tile improvement on it. (Alternatively, one may unlock any land-based resource either by building a Fort on it, or by settling a City directly on top of it; however, since they give no improvement bonus to the tile, it is typically preferable to build the proper tile improvement.) The tile improvement which unlocks each particular resource is listed in the tables below. For example, Wheat Wheat (Civ4).png is unlocked by a Farm.

For the most part, the enabling technology is the technology which allows the building of the resource's particular tile improvement. For example, Gems Gems (Civ4).png are enabled by Mining, which is the technology which allows the building of the Mine; prior to the discovery of Mining, a City settled atop Gems will not have the Gems' +1 Happiness (Civ4).png bonus, nor will Gems be made available for trade. The sole exception is Uranium Uranium (Civ4).png which, despite being associated with the Mine improvement which is allowed with Mining, is only enabled by Fission.

In summary, to gain access to the trade resource in a city, all of the following conditions must hold:

  • The resource must be revealed by the revealing technology.
  • The civilization controlling the tile must have the technology to enable that resource.
  • The tile must have the right tile improvement (or a Fort, or a City) to unlock the resource.
  • The tile must have trade access to the city.

Unless directly settled upon by a City, to get trade access to a tile resource, its tile must be connected by road or river to a nearby city. When you build a road to a resource tile which you've improved, this is called hooking up that resource. To allow trade with an encountered foreign civilization, the network of roads and rivers must connect all of: 1. the tile resource, 2. your Capital city, and 3. the foreign civilization's Capital city.

Via Wonders[]

There are three late-game trade resources - Hit Movies (Hit Movies (Civ4).png), Hit Singles (Hit Singles (Civ4).png), and Hit Musicals (Hit Musicals (Civ4).png) - which are created via building particular wonders. When a civilization owns such a wonder, it obtains a certain number of the associated hits into its trade network. (The particular number of resources varies with the map size—more resources for larger maps.) Hits cause happiness in any civ and may be traded just as any other trade resource.

Via Trade[]

Trade resources can also be gained by trading between civilizations. With trade access, one civ can make a deal with another to supply a trade resource, in return getting gold Coins (Civ4).png or some other trade resource.

Via a Corporation[]

There are two trade resources, Oil Oil (Civ4).png and Aluminum Aluminum (Civ4).png, which can alternatively be accessed in a city by having a corporate branch there. Oil is available in all cities with Standard Ethanol Standard Ethanol (Civ4).png. Aluminum is available in all cities with Aluminum Co. Aluminum Co. (Civ4).png.

Tables of Resources by Type[]

There are three main subtypes of resources: strategic resources, luxury resources, and food resources. These are described below, with a listing of the resources of each type.

Strategic Resources[]

With the exception of Uranium Uranium (Civ4).png, all strategic resources give +1 Hammer (Civ4).png Production tile bonus on their tile regardless of what tile improvement it may have, so long as the resource has been revealed. All except Uranium Uranium (Civ4).png give additional hammers Hammer (Civ4).png when unlocked by the proper tile improvement.

Most strategic resources allow the building of certain military units, for example, a city must have access to Horses to build mounted units, Iron for Swordsmen, or Uranium for the ICBM. Most of them also give a +100% production bonus to certain buildings. Marble and Stone are exceptional in that they do not permit any military unit, and one or the other of them gives +100% Hammer (Civ4).png to the building of most wonders.

Resource,
Tile bonus
Improvement
(Requires)
Improvement base yield Improvement bonus yield Revealed by Note
Aluminum (Civ4).png Aluminum,
+1 Hammer (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
+1 Hammer (Civ4).png, +1 Coin (Civ4).png Industrialism
Industrialism
Also provided by Aluminum Co. (Civ4).png
Coal (Civ4).png Coal,
+1 Hammer (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
+1 Hammer (Civ4).png Steam Power
Steam Power
Allows building of railroads
Copper (Civ4).png Copper,
+1 Hammer (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
+1 Hammer (Civ4).png Bronze Working
Bronze Working
Horse (Civ4).png Horse,
+1 Hammer (Civ4).png
Pasture
(Animal Husbandry)
none +2 Hammer (Civ4).png, +1 Coin (Civ4).png Animal Husbandry
Animal Husbandry
+1 Happiness (Civ4).png with Hippodrome (Byzantium only)
Iron (Civ4).png Iron,
+1 Hammer (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
+1 Hammer (Civ4).png Iron Working
Iron Working
Marble (Civ4).png Marble,
+1 Hammer (Civ4).png
Quarry
(Masonry)
+1 Hammer (Civ4).png with a railroad +1 Hammer (Civ4).png, +2 Coin (Civ4).png always revealed
Oil (Civ4).png Oil,
+1 Hammer (Civ4).png
Well
(Combustion)
or
Offshore Platform
(Plastics)
none +2 Hammer (Civ4).png, +1 Coin (Civ4).png Scientific Method
Scientific Method
• Allows building of railroads
• Also provided by Standard Ethanol (Civ4).png
Stone (Civ4).png Stone,
+1 Hammer (Civ4).png
Quarry
(Masonry)
+1 Hammer (Civ4).png with a railroad +2 Hammer (Civ4).png always revealed
Uranium (Civ4).png Uranium Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
+3 Coin (Civ4).png Physics
Physics
• Enabled by Fission
• No tile bonus

Luxury Resources[]

Most tile-based luxury resources give +1 Coin (Civ4).png Commerce tile bonus on their tile regardless of what tile improvement it may have. The three exceptions are Ivory Ivory (Civ4).png, which has a tile bonus of +1 Hammer (Civ4).png Production, and Sugar Sugar (Civ4).png and Whale Whale (Civ4).png, which both have a tile bonus of +1 Bread (Civ4).png Food.

All tile-based luxury resources give additional Coin (Civ4).png Commerce when unlocked by the proper tile improvement. Note that Gems Gems (Civ4).png, Gold Gold (resource) (Civ4).png, and Silver Silver (Civ4).png have a -1 Hammer (Civ4).png improvement bonus yield, which decreases the Mine's Production from +2 Hammer (Civ4).png (without a railroad) to +1 Hammer (Civ4).png.

All luxury resources give +1 Happiness (Civ4).png Happiness to cities that have access to them. Many give an additional +1 Happiness (Civ4).png Happiness with an appropriate building, whereas others give +1 Health (Civ4).png Health.

Resource,
Tile bonus
Improvement
(Requires)
Improvement base yield Improvement bonus yield Effects Note
Dyes (Civ4).png Dye,
+1 Coin (Civ4).png
Plantation
(Calendar)
none +4 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Theatre
Furs (Civ4).png Fur,
+1 Coin (Civ4).png
Camp
(Hunting)
none +3 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Market
Obsoleted by Plastics
Gems (Civ4).png Gems,
+1 Coin (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
-1 Hammer (Civ4).png, +5 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Forge
Gold (resource) (Civ4).png Gold,
+1 Coin (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
-1 Hammer (Civ4).png, +6 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Forge
Incense (Civ4).png Incense,
+1 Coin (Civ4).png
Plantation
(Calendar)
none +5 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Cathedral
Ivory (Civ4).png Ivory,
+1 Hammer (Civ4).png
Camp
(Hunting)
none +1 Hammer (Civ4).png, +1 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Market
Obsoleted by Industrialism
Silk (Civ4).png Silk,
+1 Coin (Civ4).png
Plantation
(Calendar)
none +3 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Market
Silver (Civ4).png Silver,
+1 Coin (Civ4).png
Mine
(Mining)
• +2 Hammer (Civ4).png
• +1 Hammer (Civ4).png with a railroad
-1 Hammer (Civ4).png, +4 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Forge
Spices (Civ4).png Spices,
+1 Coin (Civ4).png
Plantation
(Calendar)
none +1 Bread (Civ4).png, +2 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Health (Civ4).png with Grocer
Sugar (Civ4).png Sugar,
+1 Bread (Civ4).png
Plantation
(Calendar)
none +1 Bread (Civ4).png, +1 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Health (Civ4).png with Grocer
Whale (Civ4).png Whale,
+1 Bread (Civ4).png
Whaling Boats
(Optics)
none +1 Hammer (Civ4).png, +2 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Happiness (Civ4).png with Market
Obsoleted by Combustion
Wine (Civ4).png Wine,
+1 Coin (Civ4).png
Winery
(Monarchy)
none +1 Bread (Civ4).png, +2 Coin (Civ4).png • +1 Happiness (Civ4).png
• +1 Health (Civ4).png with Grocer

The three "Hit" luxury resources are exceptional in that they are not located on tiles. Instead, a monopoly is granted to whomever controls the resource's late-game wonder, either by building the wonder or by capturing it from another civilization.

"Hit" resource Wonder
(Requires)
Effects Effects
(Building bonus)
Effects
(Unique building bonus)
Hit Movies (Civ4).png Hit Movies Hollywood
(Mass Media)
+1 Happiness (Civ4).png +1 Happiness (Civ4).png with Broadcast Tower +1 Happiness (Civ4).png with Mall (America only)
Hit Musicals (Civ4).png Hit Musicals Broadway
(Electricity)
+1 Happiness (Civ4).png +1 Happiness (Civ4).png with Broadcast Tower +1 Happiness (Civ4).png with Mall (America only)
Hit Singles (Civ4).png Hit Singles Rock 'n' Roll
(Radio)
+1 Happiness (Civ4).png +1 Happiness (Civ4).png with Broadcast Tower • +1 Happiness (Civ4).png with Odeon (Greece only)
• +1 Happiness (Civ4).png with Mall (America only)

Food Resources[]

All food resources give +1 Bread (Civ4).png Food tile bonus on their tile regardless of what tile improvement it may have. All of them give additional food when unlocked by the proper tile improvement.

All food resources give +1 Health (Civ4).png Health to cities that have access to them, and an additional +1 Health (Civ4).png Health with an appropriate building.

Resource,
Tile bonus
Improvement
(Requires)
Improvement base yield Improvement bonus yield Effects
Bananas (Civ4).png Banana,
+1 Bread (Civ4).png
Plantation
(Calendar)
none +2 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Grocer
Clam (Civ4).png Clam,
+1 Bread (Civ4).png
Fishing Boats
(Fishing)
none +2 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Harbor
Corn (Civ4).png Corn,
+1 Bread (Civ4).png
Farm
(Agriculture)
• +1 Bread (Civ4).png with irrigation
• +1 Bread (Civ4).png with Biology
+2 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Granary
Cow (Civ4).png Cow,
+1 Bread (Civ4).png
Pasture
(Animal Husbandry)
none +1 Bread (Civ4).png, +2 Hammer (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Supermarket
Crab (Civ4).png Crab,
+1 Bread (Civ4).png
Fishing Boats
(Fishing)
none +2 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Harbor
Deer (Civ4).png Deer,
+1 Bread (Civ4).png
Camp
(Hunting)
none +2 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Supermarket
Fish (Civ4).png Fish,
+1 Bread (Civ4).png
Fishing Boats
(Fishing)
none +3 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Harbor
Pig (Civ4).png Pig,
+1 Bread (Civ4).png
Pasture
(Animal Husbandry)
none +3 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Supermarket
Rice (Civ4).png Rice,
+1 Bread (Civ4).png
Farm
(Agriculture)
• +1 Bread (Civ4).png with irrigation
• +1 Bread (Civ4).png with Biology
+1 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Granary
Sheep (Civ4).png Sheep,
+1 Bread (Civ4).png
Pasture
(Animal Husbandry)
none +2 Bread (Civ4).png, +1 Coin (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Supermarket
Wheat (Civ4).png Wheat,
+1 Bread (Civ4).png
Farm
(Agriculture)
• +1 Bread (Civ4).png with irrigation
• +1 Bread (Civ4).png with Biology
+2 Bread (Civ4).png • +1 Health (Civ4).png
• +1 Health (Civ4).png with Granary

Calculating Tile Yields[]

By using the above tables, along with the yield data from Terrain, the tile yields of any given tile can be calculated. Below are some examples of how such yields are derived.

Example 1[]

Resource (Civ4) tile yield example1.png

In this first example, a riverside Plains-Hill Windmill on top of Coal has a total yield of:

1 Bread (Civ4).png, 5 Hammer (Civ4).png, 2 Coin (Civ4).png

The adjacent city contains a Levee. The Windmill is only partly upgraded: the technology Replaceable Parts has been discovered, the technology Electricity has not been discovered, and the Environmentalism civic is not being run. The leader is not Financial.

Using the above tables, we see that Coal is unlocked by either a Mine (or a Fort, or a City) and only a Mine can allow Coal's improvement bonus yield of +1 Hammer (Civ4).png. As a Windmill is being used instead, no improvement bonus yield is awarded. Additionally, even if the tile were connected to the civilization's capital by a road, the use of a Windmill means that the tile does not make available any Coal resource, neither for domestic use nor for foreign trade. Nonetheless, the tile may still be valuable to the adjacent city working it, due to the relatively high yield.

Category of Contribution Yield Contribution Bread (Civ4).png Hammer (Civ4).png Coin (Civ4).png
Terrain Plains +1 +1 0
" Hill -1 +1 0
" No Terrain feature 0 0 0
" Adjacent river 0 0 +1
Resource Coal Coal (Civ4).png tile bonus 0 +1 0
Improvement Windmill base yield +1 0 +1
" Replaceable Parts 0 +1 0
" No Electricity 0 0 0
" No Environmentalism 0 0 0
Improvement Bonus

from Resource

No Mine Bonus

from Coal Coal (Civ4).png

0 0 0
Buildings River tile with Levee 0 +1 0
Total Yield on Tile ................................. 1 5 2

Example 2[]

Resource (Civ4) tile yield example2.png

In this example, a non-Financial leader has a Grassland-Flatland Mine on top of Gems, with no railroad, has a total yield of:

2 Bread (Civ4).png, 1 Hammer (Civ4).png, 6 Coin (Civ4).png

Using the above tables, we see that Gems are unlocked by either a Mine (or a Fort, or a City) with only a Mine allowing for the Gems' improvement bonus yield of +1 Hammer (Civ4).png. Because a Mine is present, an improvement bonus of -1 Hammer (Civ4).png +5 Coin (Civ4).png is awarded, which dramatically increases the tile's Coin (Civ4).png Commerce yield at the expense of a slight reduction of the Hammer (Civ4).png Production yield which Mines usually provide. Because the enabling Mining technology has been discovered, the unlocking Mine improvement is present, and the tile is connected to the civilization's capital city by road network, the Gems resource is made available to the civilization for domestic use or trade. If not traded away, the Gems provide +1 Happiness (Civ4).png to all connected cities and an additional +1 Happiness (Civ4).png to those with a Forge, with additional bonuses available to connected cities with Civilized Jewelers Inc. Civilized Jewelers Inc. (Civ4).png.

Category of contribution Yield Contribution Bread (Civ4).png Hammer (Civ4).png Coin (Civ4).png
Terrain Grassland +2 0 0
" Flatland 0 0 0
" No Terrain feature 0 0 0
" No river 0 0 0
Resource Gems Gems (Civ4).png tile bonus 0 0 +1
Improvement Mine base yield 0 +2 0
" No railroad 0 0 0
Improvement Bonus

from Resource

Mine Bonus

from Gems Gems (Civ4).png

0 -1 +5
Buildings None
Total Yield on Tile ..................................... 2 1 6
Civilization IV [edit]
WarlordsBeyond the SwordColonization

Buildings (Unique) • CivicsCivilizationsErasLeaders (Traits) • ReligionsResourcesSoundtrackTechnologiesTerrains (Tile Improvement) • Units (UniqueClassPromotions) • Wonders

Coin (Civ4).png CommerceCulture (Civ4).png CultureBread (Civ4).pngFoodEspionage (Civ4).png EspionageHappiness (Civ4).png HappinessHealth (Civ4).png HealthPower (Civ4).png PowerHammer (Civ4).png ProductionBeaker (Civ4).png Science

† Total conversion remake of the game Sid Meier's Colonization using Civilization IV engine
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