No testing has found even a trace of gold in these, and there is nothing to support belief in this myth, which appears to originate in the mid-19th century.Burger, in his study of Ch'ing Dynasty cash, made a case for these coins being a special issue of AD 1713, to celebrate K'ang Hsi's 60th birthday.From the reign of Yung-cheng, to the end of the Ch'ing dynasty, almost all of the coins conform to the standard types, with "BOO" in the reverse to the left, and the mint name in Manchurian script to the right. His is also one of the few Chinese emperors to abdicate the throne, which he did to honor K'ang Hsi (his father) by ending his reign just before it would have exceeded the length of K'ang Hsi's reign.
Please note that we are currently up grading this section, and for those coins for which we indicated "value not yet determined", they are not necessarily scarce and we will be adding the values in the not too distant future (a few of them are rare).
The primary series has the regular Ch'ien-lung inscription, produced at many mints throughout his reign. The name is written in Manchurian on the left, and Arabic on the right. F .00   VF .00 S-1524, "BOO YUN" (Yunnan mint).
The second type is referred to as the Shan-lung commemorative issue, with two upright strokes added to the bottom of the character "Lung", and is thought to have been issued during the period from his abdication in 1795 to his death in 1799. ) Note the two small upright lines at the bottom of the bottom character. F .00 VF .00 S-1525, "BOO T'UNG" (Probably Tung Ch'uan in Yunnan, not Ta-tung in Shansi as Schjoth lists). F .00 C-30-8, 10 Cash (same size as a 1 cash) of Aksu mint in Sinkiang province.
When two or more reign titles used the same mint mark, we normally use the same image of of the mint mark for all of them, which speeds up download times, but means that some of the mint marks on the actual coins will have stylistic differences from the images used.
During the mid 1500's the Manchurians rebelled against the Ming Dynasty, and in AD 1559 Nurhachu (also know as T'ai Tsu) established a small Manchu dynasty.