Kunin Technologies, which pulls critical metals from mine waste, has raised $15.2 million

A Form D filed Friday shows 20 investors put money into the Chattanooga startup through equity and SAFEs, a big step up from the $1.75 million it had raised as of March.

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A large rough gray rock lies among gravel before a wire fence and hills, beside a sign reading “Kunin.”

A Form D filed Friday shows 20 investors put money into the Chattanooga startup through equity and SAFEs, a big step up from the $1.75 million it had raised as of March.