Primary Halo Zoning And Prediction Of Deep Ore-body Of The Zhaishang Gold Deposit,Gansu

The Zhaishang gold deposit in Gansu Province is located in the West Qinling area,it is a giant Carlin-like gold deposit discovered recently.The mining area is Located in the western part of the Min-Li metallogenic belt,and the tectonic location Located in Xicheng-Fengtai-Zhenxun Tension-pulling Depression Basin in the West Section of the North Belt of West Qinling,the gold mineralization in the mining area is relatively common.Hydrothermal filling is responsible for the formation of fractured ore-bearing faults.In this paper,based on the basic theory of primary halos,the original data of 515samples of six boreholes in the 148-line section of the Northern ore belt were analyzed and analyzed by statistical analysis methods.Elemental anomalies were identified and elements were identified.Based on the axial zoning sequence,the formation mechanism of the elemental zonal sequence was analyzed.Finally,a deep orebodies prediction model was established.The results of the prediction of the deep blind orebodies were as follows:?1?Ten elements in the borehole The raw halo raw data was processed and the anomalous profile of each element was plotted.It can be seen from the figure that the original halo zone of the ore body is obviously and well developed,and the primary halos of most of the elements and the strike distribution of the ore body are basically the same.?2?Using the original Grigorian halo method,the original halo sequence?from shallow to deep?in the 148 section of the Northern ore belt is obtained?Pb-Zn-Sb-Ag-W-As-Au-Cu-Mo-Bi in the left side orebody.;Zn-Sb-Mo-Pb-Ag-Au-Cu-W-Bi-As in the right side orebody??3?Multiplicative index using some combination of frontal halo elements A ratio is obtained compared with the cumulative multiplier value of the combination of tail-zone elements,and the depth of the ore body can be estimated by the ratio of the ratio.The change trend is:the left ore body prediction model:ore body head?elevation 2730m?3.17×10^-1?Middle of the ore body?elevation 2649m?3.32×10^-2?tail of the ore body?elevation 2570m?1.39.The index gradually decreases with the depth of the ore body and reaches the tail of the ore body suddenly increases,which indicates that there may be a blind ore body in the deep.Right side ore body prediction model:ore body head?elevation 2760m?11.92?upper ore body?elevation 2700m?3.17×10^-1?lower orebody?elevation 2650m?1.09×10^-1?tail of ore body?Level 2600?2.15.The index number of the right ore body has experienced a process of weakening to increase.The increase in the number of tail indicators indicates the development of frontal halo elements,indicating that there may be a blind ore body in the deep.