CH-7 is known to contain mantle nodules throughout.
The distribution is not known and confirmation that the nodules contain diamonds is unknown.
Chidliak does have known nodules throughout various kimberlites and CH-6 actually has tested diamonds in a few samples containing 10X the amount of diamonds.
Check out this page for mantle nodules at Chidliak -- Chidliak Mantle Nodules
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