Sampling of heap leach tailings
Sampling of ore-tailing after heap leaching is an important and not completely solved problem. Because the grade of the tailings is the key data reflecting the final result of the heap leaching. At present, the following methods are used in China:
1. Drilling (or digging) sampling
After the heap leaching is completed, the rig is drilled at a certain interval on the heap, or the well is dug according to a certain degree of network. The drilling method is suitable for ore piles with a small degree of fragmentation (eg -15 mm). For the ore heap with large block size, the drilling method on the one hand is too small to meet the processing shrinkage needs of the sample; on the Other hand, the drilling machine is inconvenient for the large and loose ore heap operation, and takes It does not represent the ore sample at the bottom of the large ore and the heap; if it is not properly operated, it may damage the underlayer. Therefore, the excavation method is often used for the ore heap with large block size. It can take out a large amount of ore and can sample at different depths on the well wall. However, digging well sampling, labor intensity, and poor safety. Special attention should be paid to the collapse of the well during operation.
Second, random sampling during the unloading process
At present, most of the domestic dumping sites are transported to the waste rock yard for permanent storage after the heap leaching, and then new piles are built. Therefore, in the process of unloading, the bulldozer can be used to push the tailings layer by layer or use the excavator to catch the tailings into the mining tool. In this way, the stack can be unloaded at the same time, random sampling by car or layer by layer, Xinjiang Shull Black gold mine tailings heap leaching field is kind of doing so.
Third, the pre-processing sample method
Its specific practice is: pre-processing and preparing a large sample of ore with similar grades, ore lumps, and similar lithology, divided into several parts; according to the plan, during the pile-up process, at different depths of the pile These samples are placed in different areas. After the end of the heap leaching, these pre-embedded samples are taken out and analyzed to replace the grade of the heap leaching tailings. The industrial test reactor of Guizhou Zimuyu Gold Mine is divided into three layers, a total of 108. The leaching rate calculated from this is in good agreement with the tail slag analysis results of the random sampling of the whole pile during the unloading process.
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