| Company | Orezone Gold Corporation |
| Date | March 2014 |
| Region | Not Specified |
| Commodities | Gold |
| Mine Type | Open Pit |
| Throughput | 15,000 tpd |
| Mine Life | 8 years |
| Annual Production | 5,475,000 t |
| Status | Development |
Executive Summary
This 2014 Preliminary Economic Assessment outlines the proposed development of the Bomboré Gold Project by Orezone Gold Corporation. The project is designed as an open-pit mine targeting two distinct ore types: saprolite (oxide) and sap-rock (transition). The processing strategy relies on a heap leach circuit capable of treating approximately 15,000 tonnes per day, with an estimated mine life of 8 years based on a total ore reserve of 45 million tonnes.
The processing plant design includes a three-stage crushing circuit to prepare the ore for leaching, followed by agglomeration using lime and cement to improve permeability. The heap leach system utilizes a cyanide solution applied at a rate of 8 L/h/m², with a designed leach time of 75 days. Gold recovery is achieved through a carbon adsorption circuit, followed by desorption, electrowinning, and smelting to produce doré bullion.
The report details the engineering basis for the crushing, leaching, and recovery systems, including stability analyses for the leach pad and water balance modeling for a zero-discharge operation. Preliminary engineering was conducted by Kappes Cassidy and Associates, with design criteria established for crushing product sizes, reagent consumption, and power requirements across two phases of heap expansion.
Website: https://orezone.com/press-releases/orezone-reports-first-gold-from-bombore-hard-rock-expansion/
Report Date: March 2014
Region: Not Specified
Project Status: Development
Commodity: Gold
Throughput: 15,000 tpd
Mine Life: 8 years
Mine Type: Open Pit
Ore type:
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
Bomboré Phase II Expansion — 2023 Technical Report
Bomboré Phase II Expansion — 2023 Technical Report
| Company | Bomboré |
| Mine | Bomboré |
| Region | Nobsin River Area |
| Commodities | Gold |
Executive Summary
This report details the Recovery Methods for the Bomboré Phase II Expansion Definitive Feasibility Study, focusing on the integration of a new Hard Rock plant with the existing Oxide plant. The total processing capacity is designed to reach 10.3 Mtpa, with the Oxide plant handling 5.9 Mtpa of Oxide and Upper Transition ores, and the new Hard Rock plant processing 4.4 Mtpa of Lower Transition and Fresh ores.
The Hard Rock plant utilizes a conventional unit operations flowsheet including crushing, grinding, pre-oxidation, and Carbon-in-Leach (CIL) circuits to maximize gold recovery while minimizing capital and operating costs. Key equipment includes a primary jaw crusher, an 18,000 kW SAG mill, and a CIL circuit with seven tanks and a pre-oxidation tank. Gold is recovered via Zadra elution, electrowinning, and smelting into doré bullion bars.
The existing Oxide plant continues to process softer saprolite ore using an MMD sizer and ball mill circuit. Both plants share carbon regeneration and gold room facilities, ensuring operational synergy. The design emphasizes reliability, maintenance access, and automation to support the Life of Mine (LOM) schedule.
Reports
- entities/Bombore_Mine
Website: https://orezone.com/operations-overview/bombore/
Report Date:
Region: Nobsin River Area
Project Status:
Commodity: Gold
Throughput:
Mine Life:
Mine Type:
Ore type:
