Mathews Empirical Method to Determine the Stability Zone of Underground Stopes in an Artisanal Mine in Central Coastal Peru (#1641)

Authors

Huaman-Rapri, Steven

Rojas-De La Vega, Neil

Pehovaz-Alvarez, Humberto

Abstract

The geomechanical evaluation of stopes is a critical component in any mining operation, especially in artisanal mines. This study focuses on the Buena Gracia artisanal mine, located on the central coast of Peru, with the objective of determining the stability zone of its stope. The Mathews empirical method is employed for this purpose, providing a graphical representation that clearly distinguishes stable and unstable zones. This representation facilitates decision-making in the design and control of the underground environment. Empirical methods in geomechanics are vital in mining, allowing for a rapid and accurate assessment of geological structure stability based on observations and previous experiences. These methods enable informed decision-making and improve mining operation safety. To calculate the Mathews method factors, two specialized software tools are used: RS2, which calculates the maximum induced compression stress value (σmax) for factor A; and Dips, which identifies the main discontinuity families for factor B. These factors, along with factor C and Barton’s Q, determine the stability number (N'). This stability number, combined with the stope’s hydraulic radius, provides the underground stope stability zone. The study successfully identified the stable zones of the stope surfaces, highlighting the importance of empirical methods in artisanal mining and demonstrating how combining these methods with modern technology can improve stope safety.