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Modeling Reactive Sulfide Rock at the Red Dog Mine

机译：在红狗矿的反应性硫化物岩

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The Red Dog Mine is a high-grade zinc-lead mine located in northwest Alaska which began operations in November 1989. In June 2014 the upper half of a charge in a trim shot in the Aqqaluk pit deflagrated. No other holes in the area were observed to react and the remainder of the pattern was shot without incident. This was the only known case of a deflagration in the 25 years of operations. As part of the investigation into the cause of this incident rock samples were obtained from the area of this hole and from other areas in this pit. The samples were assayed and tested for reactivity using the Reactive Ground Catalyzed Adiabatic test. Approximately half of the samples were found to be reactive with standard blasting agents. Unexpectedly, some of these were found to be reactive with blasting agents doped with urea to act as an inhibiter. Relationships between element grades and reactivity and between Specific Heating Capacity and reactivity were developed; however, the small sample size led to these models having an unrealistically large number of geological model blocks tagged as reactive. A program to better understand the behavior by testing more samples was initiated. Drill core was selected based on the predicted level of reactivity using the aforementioned relationships. The samples covered a greater range of grades and lithologies and included rock from the soon to be developed Qanaiyaq pit. The samples were dry pulverized then split for elemental assay, Reactive Ground Catalyzed Adiabatic testing, Specific Heating Capacity (SHC) determination, and X-ray Diffraction (XRD) mineralogical analysis. From this data, a Red Dog Mine specific assay based classification for separating reactive from non-reactive ground was developed. Furthermore, it was possible to divide the reactive ground into two subgroups: i) rock which reacts with ANFO-emulsion blends even when manufactured specifically with a reactivity suppression agent like urea and ii) rock which reacts with ordinary ANFO-emulsion blends only when a reactivity suppression agent like urea is absent.
机译：红狗矿是一家位于阿拉斯加西北部的高档锌铅矿，于1989年11月开始运营。2014年6月，在AQQaluk坑脱落的修剪射击中的收费的上半年。未观察到该地区中的其他孔反应，并且在没有事件的情况下拍摄的剩余物。这是唯一已知的25年运营中爆张的案例。作为研究该事件原因的调查的一部分，从该孔的区域和该坑中的其他区域获得。测定样品并使用反应性催化绝热试验测定并测试反应性。发现大约一半的样品用标准爆破剂反应。出乎意料地，发现其中一些与掺杂有尿素的喷砂剂充当抑制剂的反应性。开发了元素等级和反应性与特定加热能力与反应性之间的关系;然而，小样本大小导致这些模型，这些模型具有非极大量的地质模型块被标记为反应性。通过测试更多样本来更好地理解行为的程序。使用上述关系基于预测的反应水平来选择钻芯。样品覆盖了更多的成绩和岩性，并包括岩石即将开发出Qanaiyaq坑。将样品干燥粉碎然后分离用于元素测定，反应性接地催化绝热检测，特定的加热能力（SHC）测定和X射线衍射（XRD）矿物学分析。从该数据中，开发了一种基于红狗矿的特异性测定，用于将反应性与非反应性的反应性分离。此外，也可以将反应性接地分为两个亚组：i）岩体，即使在特定用尿素和II）岩石中特别用反应性抑制剂制造的岩石制造的岩石也可以与普通的Anfo-乳液混合的岩石一起制造，该岩体也是如此。反应性抑制剂如尿素不存在。

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