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GENMIN的工艺研究室一直在研究一种费用低并适用于从氰化浸出渣中浮选黄铁矿的工艺。传统的用于浮选金浸渣中含金黄铁矿的工艺只有在用硫酸消除氰化物和氢氧化物的抑制作用后才有可能进行。最近，在GENMIN的工艺研究室和在Buffelsfontein金矿现场的试验工作表明，浸渣中的含金黄铁矿可以用胺作为捕收剂来浮选。胺浮选虽然缓慢，其粗选回收率可达83％S（总量），但随后发现，用新鲜水来洗涤和重新调浆浸渣会使黄铁矿在碱性条件下很容易地浮选。进一步的研究发现，正是在再调浆以前对浸渣滤饼的洗涤才得以确定黄铁矿的抑制作用。采用这种方法并且添加新鲜水、CuSO4、SIBX和起泡剂，可以获得95．3％S（总量）的回收率。用含±100ppm氰化物的生产用水洗涤和再调浆就象生产中使用的来自锌沉淀回路（ppT）的循环使用的贫液一样，会导致对黄铁矿的有效抑制作用。在试验室试验中，这个过程的回收率只有2．9％S（总量）。
GENMIN’s Process Laboratory has been studying a process that is low-cost and suitable for flotation of pyrite from cyanide leach residues. The traditional process for flotation of gold-bearing pyrite in leached gold leachate is only possible after sulfuric acid is used to eliminate the inhibitory effects of cyanide and hydroxide. Recently, pilot work at GENMIN’s Process Laboratory and at the Buffelsfontein Gold Mine site has shown that the gold-bearing pyrite in the leach residue can be flotated with amines as the collector. Amine flotation, though slow, gave a crude recovery of up to 83% S (total), but subsequently found that washing and reslurrying the leached residue with fresh water made pyrite readily float under alkaline conditions selected. A further study found that it was the suppressive effect of pyrite that was determined prior to reslurrying the filter cake of leachate. With this method and the addition of fresh water, CuSO4, SIBX and foaming agent, 95.3% S (total) recovery was obtained. Washing and repulping with a production water containing ± 100 ppm cyanide, like the recycled lean solution from the zinc precipitation loop (ppT) used in the production, leads to an effective inhibition of pyrite. In laboratory tests, the recovery rate for this process was only 2.9% S (total).