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I always thought that if you cancelled a building while it's being built, you got all your mineral back, but I read that the extractor trick for zerg costs 6 minerals when you cancel it.

Does this apply to all buildings/races? How is that fee calculated?

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Since there is nothing which costs 1 mineral for Zerg, some people short hand this cost to 10. – tzenes Nov 30 '10 at 17:20
up vote 13 down vote accepted

You get 75% back of the cost, minerals and gas. So if you cancel a building that costs 200 minerals and 100 gas, you'll get back 150 minerals and 75 gas.

An extracter cost 25 minerals, 25% of it is 6 (after rounding), so that's what you lose for canceling it.

Notice that this only applies to buildings - canceling a unit or an upgrade gives back the full amount of minerals and gas spent.

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Is this regardless of how long the structure/unit has been in production? – Brant Nov 30 '10 at 17:22
@Brant correct, it doesn't matter how long it has been in production. – Oak Nov 30 '10 at 17:24
wow, I never realized I wasn't getting all my minerals back... – juan Nov 30 '10 at 17:41
Is this exclusive to zerg buildings or does it apply to all races? – Raven Dreamer Nov 30 '10 at 19:02
@Raven this applies to all buildings, including Terran building add-ons. – Steven Nov 30 '10 at 19:26

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