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FIFO stockpiles reclaim the oldest chunk first.
 
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LIFO stockpiles reclaim the newest chunk first.
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Blended stockpiles reclaim a homogenous blend of all chunks. The stockpile cannot be reclaimed until all chunks are full. The Blended reclaim type can be used to model large blended stockpiles that are built in campaigns.   |
Mutex Group
A Mutex Group is about making sure that the next on-blend stockpile is being built while the current on-blend stockpile is being fed.
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Minimum Build Threshold can be set for each stockpile in Setup > Stockpile Build Settings.
If all stockpiles in a group are full, the first stockpile to deplete below the threshold is switched immediately to build.
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