鉱脈

1. Origins, structure, and basic meaning

• Structure: 鉱脈, read こうみゃく, denotes a band or seam of mineral running through rock.
• Basic usage: It names a thin mineral vein found in rock and an underground vein shown by a red line on a model.

2. Common pitfalls and similar expressions

• Mineral deposit rather than mine tunnel
  • It is a band of mineral running through rock, not a passage excavated for miners.