Abstract:

The Na Bop-Pu Sap area, Bac Kan province is located in Northeastern Vietnam and is part of the Lo Gam structural zone, well-known for its rich lead-zinc mineral deposits. Based on data collection and compilation, the paper using statistical methods were applied to analyze the data and determine the characteristics of the lead-zinc ore bodies. The study found that the lead-zinc deposits in the Na Bop-Pu Sap area are primarily of the vein type and are located in the carbonatic rocks of the Coc Xo formation. The ore bodies are characterized by small thickness, a vein-like structure, and a layered form, and have been extensively explored by a comprehensive network of drilling and mining facilities. Statistical analysis revealed that the average Pb+Zn content in the TQ.1 ore body reach 7.48% (the largest scale of lead-zinc ore body), with a coefficient of variation (Vc) of 63.22% (unequal), and follows a standard logarithmic distribution. The average thickness of the TQ.1 ore body was found to be 6.6m, with a coefficient of variation (Vm) of 71.74% (unstable). The results of the quantification study led to the classification of the Na Bop-Pu Sap lead-zinc mine as a type III exploration mine. It is recommended that exploration activities be conducted using a transect exploration network, with exploration grids of size (60÷70) m × (20÷30) m, and a reserve level of 122. These results provide a foundation for suggesting a mining group and exploration grid pattern for lead-zinc ore in the Cho Don area and other lead-zinc deposits in similar geological settings.