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美国矿务局研究人员正在按今后原地浸出的条件，对黄铜矿的氨／氧浸出进行研究。在某篇评述性文献中指出两个主要问题：（１）提供充足的氧化剂可以推进浸出反应；（２）由于在矿物表面形成一层Ｆｅ２Ｏ３的反应产物，故会降低浸出动力学。初步性能研究在２Ｌ、充分搅拌的高压釜中进行，包括自动取样及数据采集，利用统计实验设计确定了从较纯黄铜矿样品中浸出铜的最重要参数，即温度、氧化剂浓度、氢氧化铵浓度、以及温度与氢氧化铵浓度之间的相互制约作甩。结果表明，为了评估氧化剂进人原地矿体的情况，需要作进一步的研究工作；并表明，添加某些有机化合物（例如单糖、聚乙烯醇）至少能使溶液中已反应的某些铁得以稳定，从而减少由于Ｆｅ２Ｏ３包裹作用造成的钝化作用。为了确认这种方法的实用效果，已研究了几种类型的有机添加剂、添加剂对铁较合的程度以及控制螯合铁的一些方法。
US Bureau of Mines researchers are leaning conditions in situ in the future, the chalcopyrite ammonia / oxygen leaching research. Two major issues are pointed out in a review article: (1) Adequate oxidant is provided to promote the leaching reaction; and (2) Leaching kinetics is reduced by the formation of a layer of Fe2O3 reaction product on the mineral surface. Preliminary performance studies were conducted in a 2 L, well-stirred autoclave, including automatic sampling and data acquisition. The statistical experimental design was used to determine the most important parameters for leaching copper from the more pure chalcopyrite samples, namely temperature, oxidant concentration, Ammonium concentration, and the temperature and the concentration of ammonium hydroxide between the constraints for rejection. The results show that further studies are needed to assess the presence of oxidizing agents in situ. It has also been shown that the addition of certain organic compounds (such as monosaccharides and polyvinyl alcohols) can at least react some of the reacted iron in the solution To be stable, thereby reducing the passivation effect due to Fe2O3 encapsulation. In order to confirm the practical effect of this method, several types of organic additives, the degree of additive compatibility with iron, and some methods of controlling chelated iron have been studied.