One of the mysteries of the English language finally explained.
- another term for kimberlite
- ‘To the northwest in section 8, a group of grassy springs with some 'blue ground' were found.’
- ‘In the early days, blue ground was dumped in big piles and the miners waited to extract the diamonds until weathering had turned the kimberlite into yellow ground.’
- ‘When they reached the bottom of the soft yellow ground and struck the "blue ground" that lay underneath, many miners thought their claims had petered out.’
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