One of our chinese customers detected an amazing coin treasure using his OKM 3D ground scanner eXp 5000. He located hundreds of so-called “cash”-coins buried in 3 meters depth. Those coins seems to be 200 – 300 years old and date back to the Qing-Dynasty which reigned the Chinese Empire from 1644 until 1911. Cash coins were always a payment instrument of the lower class. That is why those coins were never made of silver and gold, mainly of copper or bronze.