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<p>The application of mineralogy and ore characterization holds a significant role in the development of mineral processing. The present research focuses on assessing the processing of gold from oxide ores, especially gold-bearing iron oxides with a gold grade of 1.1&#xa0;g/ton. First, the mineralogical and microscopic studies of the ore sample were examined. Afterward, the recovery of gold from the ore was analyzed through gravity concentration and cyanidation techniques. The results illustrated that the sample is composed of oxide minerals and contains free gold and exposed gold in the particle size below 150&#xa0;µm. Pre-concentration tests of gold-bearing minerals were conducted using gravity separation techniques, including a shaking table and a Knelson concentrator. The results indicated that the recovery of gold through these methods was limited due to insufficient quantities of free gold grains present in the coarser size fraction. Subsequently, cyanidation studies were carried out at pH 10.5, 3000&#xa0;mg/L of cyanide concentration, and 24 h of leaching time. The selected variables were temperature, solid contents, and particle size. The highest gold recovery (95.03%) was achieved with experimental conditions: particle size of 80% passing 53&#xa0;µm, 25% solid contents, and leaching temperature of 80&#xa0;°C. If a detailed technical and economic evaluation is conducted to optimize energy consumption and reduce grinding costs in the industry, it may be feasible to use the particle size of 80% passing 147&#xa0;µm, as the ideal particle size for the cyanidation process. This approach has led to a gold recovery rate of 90.51% at leach conditions of 30% solid content and ambient temperature.</p> Graphical abstract <p></p>

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Gold-Bearing Iron Oxides Processing Based on Ore Characterization: Gravity Pre-concentration and Cyanide Dissolution

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Hamidreza Roostaei,
  • Masoumeh Kordparijaei,
  • Shahin Mesroghli

摘要

The application of mineralogy and ore characterization holds a significant role in the development of mineral processing. The present research focuses on assessing the processing of gold from oxide ores, especially gold-bearing iron oxides with a gold grade of 1.1 g/ton. First, the mineralogical and microscopic studies of the ore sample were examined. Afterward, the recovery of gold from the ore was analyzed through gravity concentration and cyanidation techniques. The results illustrated that the sample is composed of oxide minerals and contains free gold and exposed gold in the particle size below 150 µm. Pre-concentration tests of gold-bearing minerals were conducted using gravity separation techniques, including a shaking table and a Knelson concentrator. The results indicated that the recovery of gold through these methods was limited due to insufficient quantities of free gold grains present in the coarser size fraction. Subsequently, cyanidation studies were carried out at pH 10.5, 3000 mg/L of cyanide concentration, and 24 h of leaching time. The selected variables were temperature, solid contents, and particle size. The highest gold recovery (95.03%) was achieved with experimental conditions: particle size of 80% passing 53 µm, 25% solid contents, and leaching temperature of 80 °C. If a detailed technical and economic evaluation is conducted to optimize energy consumption and reduce grinding costs in the industry, it may be feasible to use the particle size of 80% passing 147 µm, as the ideal particle size for the cyanidation process. This approach has led to a gold recovery rate of 90.51% at leach conditions of 30% solid content and ambient temperature.

Graphical abstract