Fluid inclusion study in the Huanuni mine, Bolivia.

Secondary inclusions along a healed crack show a wide range of filling temperatures but a narrow range of salinities. This would suggest that the inclusions were trapped from similar solution in different gas/liquid ratios, due mainly to boiling of the ore forming fluid. The mode of occurrence of the fluid inclusions indicates that the fluid boiled frequently at all stages of mineral deposition. Since the lowest filling temperature of those inclusions would be close to the trapping temperature, it is concluded that the forming temperatures in the early and late vein stages were about 350 and 100 degrees C respectively. The boiling under conditions of super saturation, would also cause the profuse deposition of fine grain minerals at Huanuni mine.
Secondary inclusions along a healed crack show a wide range of filling temperatures but a narrow range of salinities. This would suggest that the inclusions were trapped from similar solution in different gas/liquid ratios, due mainly to boiling of the ore forming fluid. The mode of occurrence of the fluid inclusions indicates that the fluid boiled frequently at all stages of mineral deposition. Since the lowest filling temperature of those inclusions would be close to the trapping temperature, it is concluded that the forming temperatures in the early and late vein stages were about 350 and 100 degrees C respectively. The boiling under conditions of super saturation, would also cause the profuse deposition of fine grain minerals at Huanuni mine.