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The recovery amount is impossible to predict, since Mother Nature doesn't operate in absolute ratios.

According to Wikipedia:

"In reconnaissance for diamond mining, blue ground refers to a layer of non-oxidized kimberlite. Kimberlites are a class of igneous rocks commonly associated with diamond mining."

Unless the blueground was incredibly rich, your carat recovery may be very small. In addition, about 80% of all diamonds mined are industrial diamonds, not gemstone quality.

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