Why my miners are not using my stockpile?

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I decided to put a stockpile near my mine to minimize the resource move time, but instead they are just dropping the iron to the dirt, when there's a stockpile right in front of it. What I'm doing wrong?
Improving the question, is it true that miners only mine and do not drop the iron at the nearest stockpile?
Well, it's getting real ironic how the guys at the quarry do their job but the miners don't:
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What is stockpiling in mining?
An accumulation of ore or mineral built up when demand slackens or when the treatment plant or beneficiation equipment is incomplete or temporarily unequal to handling the mine output; any heap of material formed to create a reserve for loading or other purposes.What is an ore stockpile?
Stockpiles are used between mine and concentrator for large quantities and very coarse ore. They are also large enough to allow blending to provide a more consistent plant feed. Formed on an earthern or concrete pad by some form of stacker, they are usually uncovered.OSSGA - Stockpile Safety
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Kindel Media, Henri Mathieu-Saint-Laurent, cottonbro, Oleksandr Pidvalnyi