| Answer | Crossword Clue |
|---|---|
| ORES | Valuable minerals |
| gangue | the worthless rock in which valuable minerals are found |
| gangues | GANGUE, the worthless rock in which valuable minerals are found |
| semiprecious | Denoting minerals that can be used as gems but are considered to be less valuable than precious stones |
| placer | A deposit of sand or gravel in the bed of a river or lake, containing particles of valuable minerals |
| placers | A deposit of sand or gravel in the bed of a river or lake, containing particles of valuable minerals |
