Abstract

The optimum pit limit definition is a fundamental step in the mine planning cycle, as it determines the overall profitability of the deposit (although from a static standpoint), and provides guidance for mining sequencing. Several approaches have been developed to determine the optimum pit shell such as the Lerchs-Grossmann (LG) three dimensional (3D) graph technique, widely used in commercial applications. Moreover, parametrization of the LG approach is also applied to define intermediate phases. Nonetheless, the solutions provided for such applications are inherent to the particular application, without direct connectivity to the original data (i.e. block model), limiting the capability of further data analysis, customized reporting and visualization. ​
The aim of this short course is to describe the fundamentals of the LG 3D algorithm for optimum pit limit definition, which is based on graph theory. Practical examples will be explained using block model data from mineral deposits stored in a relational database. The examples will be developed using our customized LG3DB app. ​​
At the end of the course the participant will have a better understanding of the theory behind optimization, be able to generate his/her own optimal pit limit in a database, visualize the results in a spreadsheet, and calculate tonne/grade by developing powerful queries. ​
This short course also explains many tips and tricks developed during the +30 years of experience working in the mining industry.

LOCATION:
6395 N Camino Padre Isidoro
Tucson, AZ 85718
United States