1999 - [Elektronische Ressource]
Price Year Price Year Price
1850 17.00 1888 NA 1926 0.270 1964 0.237
1851 NA 1889 NA 1927 0.254 1965 0.245
1852 NA 1890 NA …, multiply by 2,204.62.
Note:
1850-94, in U.S. Geological Survey Minerals Yearbooks and predecessor volumes.
1895-98, 98%-pure …