1. A large supply of some metal, chemical or which is kept ready for future use, during a shortage or a period of higher prices.
2. It is an intermediate point where ore or waste is stored to keep the process running in case there's a problem.
3. 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.
4. The ore accumulated at the surface when shipping is suspended.
5. Material dug and piled for future use.
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