First Find of Ga-Bearing Minerals in Ores of Ural Massive Sulfide Deposits
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Breccia
Sulfide Minerals
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Calculation of the hexagonal pyrrhotite-pyrite-sphalerite equilibrium curve from published data indicates that the mole percent of FeS in sphalerite increased from 15 at 742 degrees C to 26 at 308 degrees C. This curve is in disagreement, below 500 degrees C, with those already published.
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Pentlandite
Sulfide Minerals
Mineral resource classification
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X-ray diffraction techniques were used to analyze 38 sphalerite samples for FeS and 27 pyrrhotite samples for Fe. The samples were selected from throughout the massive sulfides of the Quemont ore zones [Noranda, Quebec]. The data indicate the average temperature of formation of the sphalerite was 540 degrees C. with a standard deviation of + or -72 degrees C. The average temperature of formation of the pyrrhotite was 325 degrees C, with a standard deviation of + or -47 degrees C. This discrepancy is explained on the basis of the ore having formed from a sulfide melt with an original sphalerite-pyrrhotite equilibrium at around 540 degrees C., then subsequently the pyrrhotite phase has undergone readjustment in the solid state to form a more Fe-rich pyrrhotite plus pyrite. This readjustment was completed at around 325 degrees C.
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Based on the JK Drop Weight test and principle of selective crushing, a multicomponent complex ore with its component minerals, i.e., pyrrhotite, sphalerite, and quartz, was used to explore the impact crushing characteristics and relationship between the complex ore and its component minerals. Results show that the order of impact crushing resistance is quartz > pyrrhotite > ore > sphalerite. The particle-size-distribution characteristic curve of ore crushing products is always “sandwiched” between the curves of pyrrhotite, sphalerite, and quartz within the same feed-size range. When the particle size is −63 + 53, −45 + 37.5, −31.5 + 26.5, and −22.4 + 19 mm, the component mineral pyrrhotite has a negative effect on the impact crushing of ore, while the component mineral sphalerite has a positive effect. When the particle size is −16 + 13.2 mm, the component mineral pyrrhotite has a positive effect on the crushing effect of the ore, while the component mineral sphalerite has a negative effect. The component mineral quartz always has a negative effect on the impact crushing effect of ore in all the studied particle sizes.
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Sulfide Minerals
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Sulfide Minerals
Gangue
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