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Because consumers value product variety,
Low-Grade Ores
Minerals containing a smaller percentage of valuable metals or minerals, thus requiring more resources to extract them profitably.
Depletion Time
The estimated time it will take to use up a resource at its current rate of consumption.
Mineral Reserves
Quantities of minerals that can be profitably extracted and processed with current technology.
Metallic Mineral
Minerals from which metal can be extracted, typically characterized by a shiny, metallic luster and conductivity of heat and electricity.
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