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In Tropico 4, when I select to construct a mine I get an overlay showing the location and density of ressources.

Do I build the mine right on top of that or rather beneath the ressource field?

I am pretty sure I once built a gold mine directly on top of the ressources and it was unable to mine anything.

Same with farms: When I want to build a farm, I see which area is best for growth. Do I build the farm into this area, or right beneath it so the field will be there?

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up vote 17 down vote accepted

According to experiments and documents referred to in this Tropico 3 thread on the official forums:

  • Farms should be placed such that the area surrounding the building has the highest yield potential. Ideally, you place your farm on a spot with horrible yield but that has high yield around it to maximize use of farming land.
  • Mines need to be placed on top of the deposit for peak efficiency.

Since there isn't much about the mechanics of the game that has changed between the Tropico 3 and 4, it's unlikely that Tropico 4 is any different. There are posts about Tropico 4 that say pretty much the same thing about farms, although they are on other non-official sites.

FWIW: My observations through my own playthrough in Tropico 4 supports the above statements. I don't have screenshots of overlays vs. crop placement or mine placement vs extraction rate, but the most productive mines for me have been right on top of the overlay area and the most productive farms were surrounded completely by green overlay areas with the road 3-5 squares away. They will build across the street to get to good land if they have to, but I usually place my road down a stretch of spread out farms for maximum effectiveness.

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You are aware that this is a Tropico 3 thread you are referring to? The info there may not necessarily apply to Tropico 4. –  atticae Oct 9 '11 at 1:05
    
@atticae: I'll clarify my answer. Not much about the mechanics have changed between the two versions, so it's unlikely this changed. –  Shaun Oct 9 '11 at 2:07
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100% on farms, however looking at miners working I noticed that they work around the mine not inside, so it might not be a good idea to place the mine on top, will test it over the weekend. –  BanditoBunny Aug 3 '12 at 7:26
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Note that if you have the Modern Times expansion, this answer is valid only for the non-upgraded versions. Borehole Mines and Bio Farms do have to be constructed directly on top of the resource. –  Shadur Aug 7 '12 at 5:13
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I did some tests with mines, it looks like the same rule applies to mines as to farms, the should be placed close to resource, but not on top of it. –  BanditoBunny Aug 9 '12 at 8:06
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According to the Tropico Wiki:

Mines must not be located directly on top of resources, since the building will hinder the mining process, but they must be located very close to maximise production.

This matches with what the graphics indicate - when the mine was on top of the deposit, only the squares not covered were being mined, but when the mine was just off to the side, almost the whole area had miners.

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Well, it's a wiki entry without any source given or explanation where this knowledge came from, so we cannot know how reliable that information is. From what I read this is probably right thought. Any experiments supporting the theory would be nice. –  atticae Jun 29 '12 at 10:31
    
It's worth noting that based on very circumstantial evidence (i.e. I just happened to notice this in one scenario, and I didn't control for anything), the mine placed directly on top of the green was more productive than the one placed off to the side a bit. Further testing is probably warranted. Shaun probably has the right answer. –  Bobson Aug 8 '12 at 17:23
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Workers cannot mine or harvest crops where building and trees are placed. So I would avoid placing mines and farms directly on the green area, and instead place them a little further away from the green area, as this lowers their efficiency. Placing the buildings on the yellow area seems to be the most efficient way of doing it, as the workers gain easy access to the green areas, while still having some yellow areas around them.

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I personally always build a mine on both sides right next to the indicated resource marker so I have a lot more miners hired and working on the spots like gold, since there's not as much as iron.

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This is relevant to Tropico Paradise Island but may also apply to other Tropico versions.

In order for mines to be productive the mine has to be built close to, but not on top of, the yellow area for the minerals. But the mine also has to be built BELOW it. Why? Because the miners move half as fast when they're carrying minerals, speed is a lot slower when moving uphill (and makes them tired quickly) so it follows they will be a lot less productive when carrying minerals uphill.

You know that a mine's not going to be profitable anymore when they start going below the mine for minerals, although gold sells for so much that it can run for maybe ten or fifteen years after that.

Mines typically are profitable for about 25 years. And if you have a huuge mining plot you should build mines on the outside then tear them down when they're not profitable, rebuilding them working your way in. On flat islands only gold mines are worthwhile, and they don't last long.

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