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Within APS, a new stockpile build is triggered when all of the material from the stockpile has been depleted. If a stockpile switches to build mode before all of the material has been reclaimed, the build number will remain the same until all of the material from the stockpile has been depleted. In the Stockpile Builds report, the values shown for a particular build will be for the point in time where the build encountered its highest peak. This logic can be seen in the image below.
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