James St. John:
Magnetite skarn (Black Hawk Ore Body, Early Miocene, 22-23 Ma; Black Hawk Pit, Iron Mountain, Utah, USA) 1
James St. John:
Magnetite skarn (Black Hawk Ore Body, Early Miocene, 22-23 Ma; Black Hawk Pit, Iron Mountain, Utah, USA) 2
James St. John:
Magnetite skarn (Black Hawk Ore Body, Early Miocene, 22-23 Ma; Black Hawk Pit, Iron Mountain, Utah, USA) 3
James St. John:
Magnetite skarn (Black Hawk Ore Body, Early Miocene, 22-23 Ma; Black Hawk Pit, Iron Mountain, Utah, USA) 4
James St. John:
Magnetite skarn (Black Hawk Ore Body, Early Miocene, 22-23 Ma; Black Hawk Pit, Iron Mountain, Utah, USA) 5
James St. John:
Magnetite skarn (Black Hawk Ore Body, Early Miocene, 22-23 Ma; Black Hawk Pit, Iron Mountain, Utah, USA) 6
James St. John:
Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 1
James St. John:
Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 2
James St. John:
Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 3
James St. John:
Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 4
James St. John:
Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 5
James St. John:
Magnetite skarn (Early Miocene, 22-23 Ma; iron mine at Iron Mountain, Utah, USA) 6