1865: 1 Ozt. Pt (SPb, Bulk Ore @SG 21.5) = 3.94 руб Kr.
1865: 1 Ozt. Pt (+Assumed Refined Cost руб Kr. 1.1156) = 5.06 руб Kr.
1865, Russian ore production: 2,273.61 Kgs/ 73,098.29 Ozt.
Citation: A Treatise on Chemistry: Metals; Henry Enfield Roscoe, Carl Schorlemmer (1879)
"According to reliable sources, the price per kg. of purified Russian platinum in 1865 was 501 francs and in 1866 from only 457 to 549 francs."
Spink & Son : The Numismatic Circular, Vol. 15, May 1907 p. 9885:
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