1922: 1 Troy Oz. Iridium (US ore, intrinsic) = USD$ 160. -225.
Platinum needles:11/1922
California mineral production for 1922; Walter W. Bradley (1923) p.55
http://archive.org/stream/1922forniaminera00bradrich#page/58/mode/2up
June 11, 2012
USA, 1922
1922: 1 Troy Ounce Platinum (US ore, intrinsic) = USD$ 70. - 113.
1922: 1 Troy Oz. Iridium (US ore, intrinsic) = USD$ 160. -225.
Platinum needles:11/1922
California mineral production for 1922; Walter W. Bradley (1923) p.55
http://archive.org/stream/1922forniaminera00bradrich#page/58/mode/2up
1922: 1 Troy Oz. Iridium (US ore, intrinsic) = USD$ 160. -225.
Platinum needles:11/1922
California mineral production for 1922; Walter W. Bradley (1923) p.55
http://archive.org/stream/1922forniaminera00bradrich#page/58/mode/2up
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