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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