Abstract.

Inmaculada Mining Project, located in the south of the Peruvian Andes (4500 metres above sea level), in the department of Ayacucho, mainly operates its Angela Vein which has silver and gold mineralisation. The vein dips 60° towards the southeast, and measures 2 kilometres long, has a height of 200 to 400 metres and a thickness ranging from 2 to 15 metres.

Geomechanical evaluation is one of the most important aspects in mining for the operation of an ore deposit. The main objective is to ensure the overall stability of the mine in a productive and safe way throughout the mining cycle.

The aim of this study is to select the optimum mining method according to the geomechanical and geometrical vein conditions. As well as to determine the size of the openings or stopes through empirical methods and confirm them by numerical methods, ensuring the stability of the ore and the surrounding rock mass, in order to obtain low dilution.

1. Introduction

The Inmaculada Mining Project mainly consists in the operation of its Angela Vein, which has economic silver (Ag) and gold (Au) values. The vein dips 60° towards the southeast, and measures 2 kilometres (km) in length, has a height of 200 to 400 metres (m) and a thickness ranging from 2 to 15 m.

1.1. Location

The Inmaculada Mining Project is located in southern Peru in the district of Ravacayco, province of Parinacochas, department of Ayacucho, at approximately 4500 metres above sea level (masl) (Fig. 1).

1.2. Geological and Geotechnical Investigations

To determine the geological and geotechnical characteristics of the rock mass for the footwall, mineralisation and hanging wall, drilling and logging of 148 existing exploration diamond drill holes and 5 oriented-core diamond drill holes was required (Fig. 2).

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