Caracterização das zonas sísmicas mais ativas da Mina Cuiabá, Minas Gerais, Brasil.

Abstract

A medida que minas subterrâneas profundidade, aumento tensões atuantes no maciço rochoso o que ocasionar um maior número de eventos dinâmicos, como rockbursts e FOG ( Fall of Ground ). Portanto, conhecimento do maciço rochoso é primordial. A Mina Cuiabá, objeto desse estudo, é das mais importantes explorações subterrâneas de ouro do país. A medida a mina se desenvolve profundidade, a possibilidade de monitorar e prever o comportamento maciços rochosos constitui tema de alta relevância. contexto, trabalho caracterizar a microssismicidade ABSTRACT: When underground mines grow in depth, there is a raise in rock-mass stress, which can cause more complex events, such as rockbursts and FOG (Fall of Ground). A good knowledge of the rock mass is therefore important. The Cuiabá mine, the object of this study, is one of the largest underground gold mines in the country. With the development of the mine in depth, the possibility of tracking and visualizing the actions of the rock mass is a highly relevant subject. Therefore, the present work aims to characterize the microseismicity of Mina Cuiabá, based on the microseismic monitoring implemented since December 2015 along the 11 th and 17 th levels of the mine. The last 4 years of monitoring (2016-2019) were analyzed in order to better understand microseismic activity, to identify the more active zones and by the Fonte Grande Sul body – right side, followed by Fonte Grande Sul - left side and Serrotinho. Together, these three regions have concentrated almost all the events occured, in fact, Fonte Grande and Serrotinho are the most productive bodies in Cuiabá in recent years.