Design of an economically feasible support for the replacement of pillars in Providencia Mine, Antioquia - Stage 1

Main Article Content

Autores

Claudia Yasmin Montaño-Chinchilla https://orcid.org/0000-0002-3233-0077
Jorge Martin Molina-Escobar, Ph. D. https://orcid.org/0000-0002-6068-2571
Ludger Oswaldo Suarez-Burgoa, Ph. D.
Elkin de Jesús Ceballos-Guerra

Abstract

Pillar replacement in mining works is a technique of using the pillars that are part of the support structures having a high degree of mineralization, which attracts economic interest. The technique consists of replacing the support pillars of the mineral matrix that contain appreciable and beneficial quantities of mineral by artificial pillars that provide geomechanical structure to the operations, generating support and safety benefits greater than or equal to those provided by the original pillars and thus maximizing the intrinsic economic value of the available rock in the operation. Based on the literature regarding design techniques for the assembly of pillars used in underground gold mining, daily and continuous field inspections were conducted for two months, taking the necessary data for the proposed design following ISRM standards for data collection. The proposed pillars must consider a set of operational economic requirements and meet the geomechanical performance required to guarantee the safety and stability of the site. The design consisted of a combination of two types of pillars, one of concrete and one of mesh, cables and sterile material (granodiorite and dyke). The measurements consisted of RMR determination, the dimensions of the current pillars, and the geomechanical condition using detailed scanlines. Subsequently, the information was refined and correlated, and the degree of fracture and safety factor of the original pillars versus those proposed in the new designs were calculated. As a result, the optimal design for the construction of the replacement pillars should have dimensions of 2 x 1.7 x 1.7 meters, achieving a safety factor of 1.36, complying with the geomechanical requirements of safety and stability and yielding a profit of 405 % as a cost-benefit ratio in replacing the original pillars by those proposed in the design; the sterile material and mesh pillars would have dimensions of 2 x 2 x 2 meters.

Keywords:

Article Details

Licence

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

All articles included in the Revista Facultad de Ingeniería are published under the Creative Commons (BY) license.

Authors must complete, sign, and submit the Review and Publication Authorization Form of the manuscript provided by the Journal; this form should contain all the originality and copyright information of the manuscript.

The authors who publish in this Journal accept the following conditions:

a. The authors retain the copyright and transfer the right of the first publication to the journal, with the work registered under the Creative Commons attribution license, which allows third parties to use what is published as long as they mention the authorship of the work and the first publication in this Journal.

b. Authors can make other independent and additional contractual agreements for the non-exclusive distribution of the version of the article published in this journal (eg, include it in an institutional repository or publish it in a book) provided they clearly indicate that the work It was first published in this Journal.

c. Authors are allowed and recommended to publish their work on the Internet (for example on institutional or personal pages) before and during the process.
review and publication, as it can lead to productive exchanges and a greater and faster dissemination of published work.

d. The Journal authorizes the total or partial reproduction of the content of the publication, as long as the source is cited, that is, the name of the Journal, name of the author (s), year, volume, publication number and pages of the article.

e. The ideas and statements issued by the authors are their responsibility and in no case bind the Journal.

References

[1] E. Hoek, and E. Brown, Underground Excavations in Rock, London: Institution of Mining & Metallurgy, 1980.

[2] P.R. Oyangüren, D.L. de la Cuadra, R. Laín Huerta, and G. O. E., Mecánica de rocas aplicada a la minería metálica subterránea, Madrid: Instituto Geológico y Minero de España, 1984.

[3] B. H. G. Brady, and E. T. Brown, Rock Mechanics for Underground Mining, Moscow: Kluwer Academic Publishers, 2005.

[4] C. O. Brawner, Proceedings of the First International Conference on Stability in Underground Mining, New York: Society of Mining Engineers of AIME, 1982.

[5] SRK Consulting, NI43-101 Technical report on a preliminary economic assessment on the Segovia and Carla Operations, Department of Antioquia, Colombia, Zandor Capital S.A, Bogotá, 2014.

Downloads

Download data is not yet available.