The particle size distribution and the material constitution of samples taken from old milltailings of sulfide and oxidized ore are studied. It is shown that more than 50% of gold occurs in fine size grade of −0.044 mm. The method of gas adsorption reveals large specific area in the samples, which is important for re-entrainment and migration of gold and associate components. It is found that gold correlates with iron-bearing species, which is useful for the magnetic separation of gold. The differential scanning calorimetry shows that the samples of the milltailings lack significant quantity of carbon black capable to adsorb gold. It is found that it is possible to generate insoluble residuum of iron cyanoferrates in the tailings, and microne size particles of mobile gold will self-settle on them.

中文翻译：

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旧磨矿中黄金的存在和流动性

研究了从硫化矿和氧化矿的旧磨尾矿中采集的样品的粒度分布和物质组成。结果表明，超过 50% 的金出现在 -0.044 毫米的细粒度品位中。气体吸附方法揭示了样品中较大的比表面积，这对于金和相关成分的再夹带和迁移很重要。发现金与含铁物种相关，这对金的磁分离很有用。差示扫描量热法表明，磨矿样品缺乏大量能够吸附金的炭黑。研究发现，尾矿中可能会产生不溶性氰铁酸铁残留物，流动金的微米级颗粒会在其上自行沉降。