| 1. | Although relatively clean, it can release toxic hydrogen sulfide gas.
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| 2. | Some of the gold at Porgera occurs in iron sulfide minerals.
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| 3. | All will cause sulfide corrosion, resulting in a blackish tarnish.
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| 4. | The sulfide-oxidizing bacteria can also get sulfide from sediments.
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| 5. | The sulfide-oxidizing bacteria can also get sulfide from sediments.
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| 6. | A fluorescent compound, zinc cadmium sulfide, also was used.
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| 7. | The bacteria live on hydrogen sulfide gas associated with volcanic activity.
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| 8. | Padaeng imported 140, 000 tonnes of zinc sulfide in 1997.
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| 9. | The critical reaction is the oxidation of sulfide by ferric iron.
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| 10. | Sulfide minerals and analogous compounds produce gases upon reaction with oxygen.
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