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Completion: April 2007 Publisher: Guo Changqing guidance of experts: exchanging views Gong Meiling Project Leader: Lee Tin report Pages: 36 Total starts Foreword
Introduction to the report:
Test report on the optionality of ore in Anfangba gold deposit, Gansu
Report Name: Gansu Awa Dam gold mine ore Optional Test Report report format: word
Foreword:
In December 2006, XXX, Gansu Province, entrusted Xi'an Tianzhou Mining Technology Development Co., Ltd. to conduct an ore-selective ore test on the Anfangba gold deposit in Gansu. The purpose was to find out through the ore selectivity test. The natural type of ore, the order of mineral formation, the state of occurrence of gold, and structural structure. Through the ore selectivity test study, the mine is provided with reasonable beneficiation process and technical indicators to provide a basis for the development and utilization of the ore resources.
Identification number of rock and the chemical analysis shows: GOLD Gansu Awa belonging refractory dam refractory gold ore, which main reasons: First, the high arsenic containing gold, high sulfur, high iron containing, high carbon, It also contains a certain amount of copper and antimony . These minerals are extremely detrimental to the cyanidation leaching of gold and are also unfavorable for flotation. Second, the ore contains a large amount of arsenopyrite, while natural gold is present as fine particles in chalcopyrite-toxic sand minerals. Between the particles, the natural gold mineral particles are 0.01-0.05mm, the natural gold particle size is fine, and it is closely related to the poisonous sand and pyrite, which makes the dissociation of gold and arsenopyrite and pyrite difficult. It is the gold concentrate grade and gold. The main reason for the low recovery rate.
After comparing the mines with multiple schemes, the priority flotation process was selected, the gold concentrate was selected, and the preferential flotation process of sulfur was selected. The process obtained the index: gold concentrate containing 26.67 g/t, The gold concentrate contains 89.2 g/ton of silver , the gold recovery rate is 59.30%, and the silver recovery rate is 45.53%. Conclusion:
1. Anfangba gold mine in Gansu, the original ore contains arsenic, sulfur, carbon and strontium. The ore is complex in nature. The gold minerals are closely related to the poisonous sand and pyrite. The gold has a fine grain size. The gold mine is difficult to dip. Hard to choose gold ore.
2. This test carried out a multi-program test on the Anfangba gold mine. The new process of solid arsenic and solid sulfur roasting cyanidation prevented the pollution of toxic and harmful gases, and the gold leaching rate was higher than the direct cyanidation leaching rate.
3. This test finally determines the priority flotation process. The gold concentrate has a gold content of 26.07 g/t, and the gold recovery rate is 59.30%. At the same time, the associated mineral silver is recovered, and the silver concentrate grade is 89.2 g/ The recovery rate of tons and silver is 45.53%.
4. The gold grade of flotation tailings is 0.76 g/ton. After cyanidation, the leaching residue contains 0.46% gold and the gold leaching rate is 39.50%.
5. Because the ore contains high arsenic, the gold concentrate contains 6.77% of arsenic, which causes the arsenic in the gold concentrate to exceed the standard. (The national standard gold concentrate contains arsenic <0.5%), which will bring difficulties to sales.
6. Through the preliminary estimation of economic benefits, the daily processing of 100 tons of ore, the annual profit and tax can be 2.758 million yuan, the daily processing of 300 tons of ore, the annual profit and tax can be 7.735 million yuan; the daily processing of 500 tons of ore, the annual profit and tax can be 12.8296 million yuan.
7. The preliminary estimate of economic benefits is for reference only and does not make design basis.