--- title: "Underground stope drill & blast designs optimisation program" date: 2015-08-27T13:18:00-04:00 author: jessica napert canonical_url: "https://www.bbaconsultants.com/en-ca/publications/underground-stope-drill-blast-designs-optimisation-program" section: Publications --- The easiest way to mine valuable orebodies is through the use of explosives and well-planned blasting layouts that produce fragmentation profiles designed specifically for conveyance equipment in underground mines. The design of blasting patterns is specific to not only the explosives being used but also the rock or ore type being fragmented. Many blasting designs are based solely on the experience of those developed for similar orebodies in terms of properties and orientation or individuals that have some blasting experience. 1. The primary technical objective of this paper is to outline a unique methodology for determining underground blasting methodologies (developing specific blasting parameters) commensurate with explosive energies and rock/ore equations of state for a narrow-vein gold property located in Northern Quebec and for underground mines in general. The procedures developed are to define the desired fragmentation specification so that a specific thermodynamic break is generated, taking into account powder factor, energy factor, tonnages, explosive energies and distribution along with blasthole diameter and orebody orientation for a specific set of explosive and dynamic rock/ore properties. Determining dynamic modulus values for the ore using seismic sensors to measure P- and S-wave velocities, the aforementioned parameters will be utilised to set the design constraints to maximise recovery and minimise overbreak and dilution. New underground blasting software (AEGIS) will use thermodynamic break in conjunction with defined fragmentation profiles to create an array of blasting parameters used to design and plan ring layouts. This software will also allow mining planners, prior to drilling and loading a production blast, to appraise future intended blasting patterns to minimise the potential of diluting ore with host rock and the likelihood of damaging mine support structures. Note that this white paper was written in collaboration with Troy Williams and Chris Preston from iRing Inc. It was the subject of a presentation at the 11th International Symposium on Rock Fragmentation by Blasting. This content is for general information purposes only. All rights reserved ©BBA - [ 27 Jul 2026 Mining and Metals Early tailings decisions shape long-term mine performance - ![Geraldine Cosset](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/206707/Geraldine-Cosset.webp) - ![Jared Purdy](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/212424/Jared-Purdy.webp) ](https://www.bbaconsultants.com/en-ca/insights/early-tailings-decisions-shape-long-term-mine-performance "Early tailings decisions shape long-term mine performance") - [ 02 Jul 2026 Mining and Metals Python: A key tool for data analysis in mineral processing - ![Charles Blais](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/211197/Charles-Blais.webp) - ![Juan Pablo Vergara](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/211266/Juan-Pablo-Vergara.webp) ](https://www.bbaconsultants.com/en-ca/insights/python-a-key-tool-for-data-analysis-in-mineral-processing "Python: A key tool for data analysis in mineral processing") - [ 19 Jun 2026 Mining and Metals Speed is earned early in projects - ![Mm employee men jean lheureux retouch web SQ LR BBA](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/204266/mm_employee_men_jean-lheureux_retouch_web_SQ_LR_BBA.webp) - ![Mm employee men benoit richard retouch web SQ LR BBA](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/203602/mm_employee_men_benoit-richard_retouch_web_SQ_LR_BBA.webp) ](https://www.bbaconsultants.com/en-ca/insights/speed-is-earned-early-in-projects "Speed is earned early in projects") - [ 17 Jun 2026 Industrial data platforms: building a solid foundation to optimize your operations - ![Pierre Boucher](https://www.assets.bbaconsultants.com/bba-production-assets/production/images/avatars/_size_avatar/2671/Pierre-Boucher.webp) Pierre Boucher, P.Eng. Senior Engineer, Operational Technology and Infrastructure ](https://www.bbaconsultants.com/en-ca/insights/industrial-data-platforms-building-a-solid-foundation-to-optimize-your-operations "Industrial data platforms: building a solid foundation to optimize your operations") [ See all ](https://www.bbaconsultants.com/en-ca/insights "Go to Publications listing page") Let’s see what we can do together [ Contact us ](https://www.bbaconsultants.com/en-ca/contact) The easiest way to mine valuable orebodies is through the use of explosives and well-planned blasting layouts that produce fragmentation profiles designed specifically for conveyance equipment in underground mines. The design of blasting patterns is specific to not only the explosives being used but also the rock or ore type being fragmented. Many blasting designs are based solely on the experience of those developed for similar orebodies in terms of properties and orientation or individuals that have some blasting experience. 1. The primary technical objective of this paper is to outline a unique methodology for determining underground blasting methodologies (developing specific blasting parameters) commensurate with explosive energies and rock/ore equations of state for a narrow-vein gold property located in Northern Quebec and for underground mines in general. The procedures developed are to define the desired fragmentation specification so that a specific thermodynamic break is generated, taking into account powder factor, energy factor, tonnages, explosive energies and distribution along with blasthole diameter and orebody orientation for a specific set of explosive and dynamic rock/ore properties. Determining dynamic modulus values for the ore using seismic sensors to measure P- and S-wave velocities, the aforementioned parameters will be utilised to set the design constraints to maximise recovery and minimise overbreak and dilution. New underground blasting software (AEGIS) will use thermodynamic break in conjunction with defined fragmentation profiles to create an array of blasting parameters used to design and plan ring layouts. This software will also allow mining planners, prior to drilling and loading a production blast, to appraise future intended blasting patterns to minimise the potential of diluting ore with host rock and the likelihood of damaging mine support structures. Note that this white paper was written in collaboration with Troy Williams and Chris Preston from iRing Inc. It was the subject of a presentation at the 11th International Symposium on Rock Fragmentation by Blasting. This content is for general information purposes only. All rights reserved ©BBA