Talk About: -Social Security

question 22

Essay

Talk about:
-social security

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Definitions:

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.