One of the mysteries of the English language finally explained.
Kimberlite that is exposed at the surface and has become yellow as a result of atmospheric oxidation.
- ‘It is mined from a matrix of weathered clay-like rock (kimberlite) called "yellow ground."’
- ‘Quarry operations at the PPC Limeacres limestone mine revealed a small kimberlite pipe, allowing a good view of yellow ground.’
- ‘This type of deposit is called eluvium and is commonly known as "yellow ground" in mining terms.’
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