Definition

1. Adjective:
   • Extracted from an underground mine: Describes coal or other minerals that are obtained through underground mining operations, as opposed to surface or strip mining methods.

Usage

• The term "deep-mined" is used attributively, typically before a noun (like "coal"), to specify its origin.
• It is a compound adjective formed from "deep" and "mined."

Examples

• Adjective:
  • The power plant switched to using deep-mined coal.
  • The environmental impact of deep-mined resources is different from that of surface-mined ones.

Advanced Usage

• Technical/Industry Context: The term is primarily used in mining, energy, and geological discussions to distinguish the extraction method.
  • The report compared the safety records of deep-mined versus open-pit operations.

Variants and Related Words

• Deep mining (n): The method of extracting minerals from deep underground.
  • Deep mining is a challenging and costly operation.
• Underground-mined (adj): A synonym often used interchangeably with "deep-mined."

Synonyms

• Underground-mined
• Subsurface-mined

Antonyms

• Surface-mined
• Strip-mined
• Open-cast (chiefly British English)

Adjective

1. of coal, as contrasted with coal obtained from a strip mine
   • deep-mined coal