In recent years, China 's gold production has declined due to policy constraints, resource depletion, and challenges in deep mining, which are common issues faced by most enterprises. Therefore, safely and efficiently recovering resources within policy limits has become a critical priority for enterprises. This study preliminarily determines the structural parameters for mining the main shaft security pillars in the Shangpai mining district of the Paishanlou Gold Mine using the Mathews stability graphical method based on field conditions. Flac"numerical simulations were employed to evaluate the feasibility of safely recovering ore bodies within the security pillar. Results indicate that safe extraction is feasible: plastic zones induced by mining are mainly concentrated around the goaf, and 10-15 m width is recommended for pillars retained between the mining area and existing goafs. Mining causes minor deformation in the middle-lower sections of the main shaft without significant stress concentration, posing no major impact on shaftfunctionality. These findings provide theoretical support and practical guidance for mining the T4 orebody within the vertical shaft security pillar.