Figure 2

(a.) Reflected plane polarized light photomicrograph of advanced chalcopyrite flooding in hematite-bearing ores of the North Ore Shoot of the Bingham district. Note how both pyrite and hematite blades are resorbed, and how pyrite is now anhedral (as opposed to euhedral cubes in sulfide-poorer ores). Silver blades = hematite, pale yellow = pyrite, yellow = chalcopyrite, black = holes. Width of field = 2.69 mm.

(b.) Reflected plane polarized light photomicrograph of advanced chalcopyrite flooding in C-bed ore from the Superior district, Arizona. Note the sieve-texture pyrite with hematite, chalcopyrite, and bornite inclusions. Silver blades = hematite, pale yellow = pyrite, yellow = chalcopyrite, purple = bornite, black = holes, very dark gray = quartz. Width of field = 1.35 mm.
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