The rainy season poses significant challenges to mining operations. Haul trucks get stuck in soft ground, haul roads deteriorate, and pit and dump floors become boggy and slippery. Despite these challenges, supervisors and mine leadership must stay a step ahead by initiating wet-weather preparations well in advance, ideally five months before the onset of the rains. Competent sheeting material is not always readily available, which makes understanding pit rock configuration critical. This knowledge enables proactive decisions, such as stockpiling competent material for road and loading bay sheeting when conditions deteriorate. Upon reporting for the night shift, I found the pit loading bay in very poor condition. I immediately assigned a dozer to skim off the soft material, carried out extensive box cutting, and sheeted the area with approximately one metre of competent material. The result was a stable loading bay that allowed operations to run smoothly for the remainder of the 12-hour shift. Although we lost about one and a half hours to restore the conditions, the decision was worthwhile. It eliminated the risk of equipment damage, improved safety, and reduced unnecessary costs associated with burning fuel while dispatching only a few trucks due to poor conditions. These are the types of decisions supervisors must be willing to make. In many cases, it is better to temporarily shut down an operation, fix the problem properly, and resume efficiently rather than operate under unsafe and uneconomical conditions. Equally important, day shift teams must work proactively to prepare work areas for incoming shifts, ensuring conditions are favourable and operations remain sustainable. Mining is a business, effective planning is essential to keep operations safe, efficient, and running.

En minería, muchas veces los resultados más visibles dependen de acciones que ocurren antes de que empiece la operación principal. Una de ellas es la preparación del banco de perforación, una actividad que puede parecer rutinaria, pero que tiene un impacto directo en la calidad de la voladura, la seguridad en campo y la toma de decisiones operativas. La preparación del banco consiste en acondicionar el área donde trabajará la perforadora para garantizar estabilidad, seguridad y precisión. Esto incluye: • Retiro de rocas de sobre tamaño, permitiendo el tránsito seguro y estable de la perforadora. • Eliminación de rocas sueltas o colgantes en la cresta del talud, reduciendo el riesgo de caída de material. • Construcción de muros de restricción con material de voladura, para evitar el ingreso de personal y equipos no autorizados a zonas de riesgo. Cuando esta actividad se ejecuta correctamente, se logra: ✔ Marcación precisa de la malla de perforación mediante equipos topográficos. ✔ Mejores condiciones de maniobra y circulación para la perforadora. ✔ Terreno seguro y adecuado para el personal durante el carguío de explosivos. ✔ Mejor información para planificaciones de corto y mediano plazo en la explotación de futuros bancos. En operaciones mineras, los detalles operativos previos son los que muchas veces definen el éxito del resultado final. ¿Qué otras acciones operativas “pequeñas” consideran ustedes que generan un gran impacto en seguridad, productividad o calidad dentro de la minería?

Cleanliness in underground gold mines is critical for ensuring worker safety, reducing equipment failure, and maintaining operational efficiency. It mitigates risks from dust, hazardous chemical spills, and debris, which can cause serious health issues like silicosis, and improves visibility, ventilation, and emergency response, while also protecting machinery from accelerated wear and tear. Key aspects of the importance of cleanliness in underground gold mines include: Health and Safety: Regular cleaning reduces the accumulation of dust and debris, mitigating risks of respiratory diseases like silicosis, tuberculosis, and HIV, which are prevalent in the industry. Proper sanitation is essential to avoid exposure to hazardous materials. Equipment Longevity: Dust and grime are highly detrimental to the lifespan of plant and equipment. Maintaining cleanliness reduces wear and tear, ensuring machines operate optimally and decreasing the risk of malfunction. Operational Efficiency: Clean roads and working areas improve workflow and prevent downtime caused by accidents or blocked access. Clean benches in blasting operations ensure better fragmentation, reducing oversized material. Emergency Preparedness: Clean, unobstructed routes are vital for safety and enable swift, safe evacuation in case of emergencies, such as collapses. Environmental Compliance: Proper management of debris, waste, and chemical spills ensures compliance with health and safety regulations, protecting the workforce and preventing environmental contamination. Regular maintenance and cleaning, including of, for instance, underground toilets, are crucial for sustaining high operational standards. 👉..Underground cleanliness, road repairs, and tidiness are essential, not just for important visits. Always be tidy, not just for notifications.

Comparto con ustedes este banco de preguntas que elaboré en compañía de mis colegas Diego Burgos Huanambal y Danny Cao. Esperamos que este material pueda ser de utilidad para su preparación académica y profesional en temas de minería. Sigamos aportando conocimiento y fortaleciendo nuestra comunidad minera.

This week’s safety meeting reminded me how something as “routine” as barring can be the difference between life and death underground. Barring is often one of the first tasks we perform at the start of a shift — but it’s also one of the most underestimated. In gold mining, especially in South African operations, most ground-related accidents are traced back to substandard barring. The purpose of a barring buddy isn’t just to stand by — it’s to be your second pair of eyes, ensuring your safety while you ensure the ground’s stability. It’s teamwork in its purest form: one focuses on the rock, the other on the risk. From our safety officer’s reminders to daily observations, I’ve learned that the best production starts with a safe workplace. The time spent barring properly is never wasted — it’s an investment in life itself. Let’s all remember: No bar, no start. What are some of the small safety practices on your mine that make the biggest difference? 💬 #MiningSafety #GoldMining #ZVENIA #ProfessionalGoldDigger #WomenInMining #GroundControl #SafeBarSafeStart #SouthAfricanMining

Large diameter raise boring is commonly used for developing cylindrical vertical to inclined shafts in underground mines. The circular cross section is favourable from a geotechnical perspective, and a significant benefit of raise boring is an improvement in safety with the removal of personnel to work directly in the shaft during development. However, unlike conventional shaft sinking, if ground conditions are poor, there is no generally little or no opportunity to install support until the shaft is completed. As such, shaft conditions need to be well understood prior to commencing development to determine whether the shaft can remain stable throughout the back-reaming process, or stable with pre-support. An alternative location needs to be sought if conditions in the selected location are not amenable to raise boring at the desired diameter, otherwise the shaft might collapse, and the expensive gear lost. Unsafe conditions could also arise if conditions are not amenable. The geotechnical investigation requirements will vary depending on the shaft development method and geotechnical conditions at the shaft location. For the highest confidence in results, the investigation drillhole should be located as close as possible to the planned shaft axis (within 10 m) and hole deviations should be understood when assessing the confidence of results along the length of the shaft. However, there are circumstances where 10 m can be too large, such as the presence of sub-vertical adverse geological structures which might be intersected by the raise but not by a drillhole placed along the raise axis. There would be a residual risk that an unknown subvertical structure close to the raise can lead to significant failure or falloff. If there was a history of this at the site, there might be a case to drill inclined holes to confirm that there are no adverse dykes or structures near the proposed raise, at least in the weathered zone. Although the investigation drillhole should be positioned as close as possible to the planned raise, it is important to consider that reaming cannot be conducted through drill rods if they become stuck in the hole. If that is considered to be a risk, the cover hole should be stepped off by about 5 m. Other considerations for data confidence include core loss, whether from navigational drilling (which should be avoided) or from poor ground conditions. HQ triple tube drilling should be considered throughout any weathered or weak rock zones and in all cases, careful core handling and marking of drillers’ breaks should be diligently applied. In some circumstances, the geotechnical investigation drillhole might not be required. For example, at a mine where there is already significant experience in raise drilling and the geological and geotechnical conditions are already well known (and consistent), investigation drillholes are not required for shorter and smaller diameter raises (such as escapeways). However, for any large diameter raises, the risks associated with low data confidence should be well understood if a shaft investigation drillhole is not undertaken. Comprehensive practical guidance on raise bore and shaft geotechnical analysis is presented in Mine Mentor’s module on the topic. To learn more, visit: https://mine-mentor.com/learning/

En minería, solemos escuchar frases como “hay que optimizar el proceso” o “necesitamos mejorar la operación” y para algunos resulta ser lo mismo, aunque parecen equivalentes, no lo son. La optimización y la mejora continua persiguen metas distintas, se aplican en momentos diferentes y exigen herramientas propias. Técnicamente, "Optimización" se define como la búsqueda del mejor resultado posible a través de un estudio matemático y simulación. Dicho en otras palabras optimizar significa ajustar un proceso para lograr el máximo rendimiento o el mínimo costo dentro de ciertas restricciones. En minería a cielo abierto, un ejemplo típico es la programación de fases con softwares como Whittle o Vulcan, que buscan maximizar el valor presente neto del yacimiento. En ese mismo camino, en minería subterránea, la optimización se refleja en metodologías como Mine-to-Mill, que ajustan desde la fragmentación en tronadura hasta la molienda, reduciendo consumo energético y elevando la recuperación de mineral. Mientras que la Mejora continua se define como pequeños pasos que construyen resultados. Es decir la mejora continua se centra en identificar fallas, eliminar ineficiencias y reforzar la cultura de trabajo. Aquí entran metodologías como el ciclo PHVA (Planificar, Hacer, Verificar, Actuar). En la práctica, puede significar ajustar protocolos de ventilación en minería subterránea, reducir la dilución en perforación y tronadura, o rediseñar el flujo de transporte de mineral en faenas a cielo abierto. Estos dos conceptos podrian explicarse facilmente de la siguiente manera. - Optimización: es cuantitativa, se apoya en modelos y simulaciones. - Mejora continua: es iterativa, sistematica, puede llegar a ser repetitiva se enfoca en hábitos, cultura y ajustes prácticos. - Secuencia lógica: mejorar primero, optimizar después. ¿Por qué importa esta distinción? Un proceso mal diseñado no puede ser optimizado con éxito. Primero hay que mejorarlo, estandarizarlo y estabilizarlo. Solo después es posible aplicar herramientas de optimización que realmente generen valor. En minería, confundir estos términos puede llevar a inversiones en software avanzado sin haber resuelto antes problemas básicos de gestión, seguridad o cultura organizacional. Reflexión final Optimización y mejora continua no compiten: se complementan. La primera ofrece resultados medibles y cuantificables; la segunda asegura que esos resultados se sostengan en el tiempo. Juntas, son la clave para una minería más rentable, eficiente y sostenible.

✅ Definition of Size Reduction Processes Size reduction represents one of the most vital initial stages in mineral ore processing, where large rock masses are broken down to sizes suitable for subsequent chemical or physical treatment. These processes refer to the mechanical efforts aimed at decreasing the natural ore size into smaller particles that align with the requirements of the next stage, whether grinding, leaching, or concentration. The primary objective is to achieve effective liberation of valuable minerals from the host rock and increase the surface area available for reaction, thereby enhancing the overall extraction efficiency. 🛠️ Types of Crushing Ores typically pass through two main stages of crushing, each contributing to the gradual reduction of particle size in a manner that supports the operational needs of the production line. Primary crushing deals with the large rocks directly extracted from the ground or blasting areas. The aim is to reduce these oversized materials into transportable pieces using conveyors or trucks. Common equipment used in this phase includes the jaw crusher and gyratory crusher, both known for their ability to handle large sizes and high hardness. Secondary crushing follows the primary stage, focusing on refining the particle size further and producing a more uniform product. Equipment such as cone crushers and impact crushers are employed at this stage to efficiently achieve the desired size suitable for downstream processes. 📌 Importance of Crushing in Gold Extraction Crushing plays a critical role in improving the efficiency of gold extraction, as it prepares the ore in an optimal form for chemical or physical processing. Firstly, crushing increases the specific surface area of ore particles, allowing for better interaction with chemical reagents like cyanide during leaching processes. Secondly, reducing the particle size enables the liberation of fine gold particles from the host minerals, which is essential for achieving high recovery rates. Additionally, these processes reduce the burden on grinding units and lower energy and reagent consumption, ultimately decreasing the plant's operating costs. 🎛️ Controlling the Crushing Process Effective control of the crushing stages is key to maintaining process stability, reducing losses, and achieving optimal efficiency. Control begins by adjusting the discharge opening of crushers to match the target size for the next stage. Regulating the feed rate into the crushers is also essential to avoid overloading, which can cause blockages or premature wear of equipment. Screening systems are used to separate the desired particle sizes and return oversize material for re-crushing, ensuring a consistent size distribution. Routine maintenance and regular analysis of the crushed product are vital for monitoring performance and sustaining high-quality production. ⚙️ Key Performance Indicators (KPIs) To evaluate the effectiveness of the crushing process, a range of technical performance indicators is utilized to guide operational improvements and optimize results. One of the most important indicators is the measurement of the product's median size (such as P80), representing the size through which 80% of the material passes. Crushing efficiency is also monitored in relation to energy consumption, along with the production rate in tons per hour. These KPIs provide a comprehensive picture of equipment performance and product quality, enabling informed and data-driven operational decisions.

In gold processing, the ore preparation stage is the initial step in the series of core operations aimed at improving ore quality and increasing recovery rates. This phase relies on crushing and screening technologies to reduce ore size and remove unwanted impurities, making it ideally suited for subsequent agglomeration and leaching processes. Key Ore Preparation Equipment: 1️⃣ Jaw Crusher: Used to reduce the size of large rocks during the primary crushing stage. 2️⃣ Secondary Crusher: Further reduces the size of the material from the jaw crusher, producing finer particles for screening and processing. 3️⃣ Screening: Separates raw materials based on size using vibrating screens, ensuring particle size compatibility for the next processing steps. 🛡️ Occupational Health and Safety: These processes require strict safety measures, including: 🦺 Wearing Personal Protective Equipment (PPE). 💨 Dust extraction systems to minimize harmful emissions. 🔧 Regular equipment maintenance to prevent breakdowns and accidents. ⚗️ Agglomeration: Agglomeration is a crucial step in preparing ore for Heap Leaching, where fine raw materials are mixed with cement and water to form solid, cohesive agglomerates. These agglomerates contribute to: 🏗️ Improving the stack stability during heap formation. 💧 Ensuring even distribution of cyanide solution within the heaps. 📉 Reducing the loss of fine particles, thus enhancing gold recovery. تجهيز الخامات والتكوير في المعالجة بالنض: في صناعة معالجة الذهب، تُعد مرحلة تجهيز الخامات الخطوة الأولى في سلسلة العمليات الأساسية التي تهدف إلى تحسين جودة الخام وزيادة معدلات الاستخلاص. تعتمد هذه المرحلة على تقنيات التكسير والغربلة لتقليل حجم الخام وإزالة الشوائب غير المرغوبة، مما يُهيئه بشكل مثالي لعمليات التكوير والنض اللاحقة. ⚙️ معدات تجهيز الخامات الأساسية: 1️⃣ الكسارة الفكية (Jaw Crusher): تُستخدم لتقليل حجم الصخور الكبيرة في المرحلة الأولى من التكسير. 2️⃣ الكسارة الثانوية (Secondary Crusher): تُقلل الحجم الناتج من الكسارة الفكية إلى جزيئات أدق لعمليات الغربلة والمعالجة. 3️⃣ الغربلة (Screening): تفصل المواد الخام حسب حجمها باستخدام شبكات اهتزازية لضمان توافق الجزيئات مع متطلبات العمليات اللاحقة. 🛡️ السلامة والصحة المهنية: تتطلب هذه العمليات إجراءات صارمة تشمل: 🦺 ارتداء معدات الوقاية الشخصية. 💨 أنظمة شفط الغبار لتقليل الانبعاثات الضارة. 🔧 صيانة دورية للمعدات لتجنب الأعطال والحوادث. ⚗️ التكوير: تمثل عملية التكوير خطوة جوهرية في تهيئة الخام للنض (Heap Leaching)، حيث يتم خلط المواد الخام الناعمة مع الأسمنت والماء لتكوين كرات صلبة ومتماسكة. هذه الكرات تساهم في: 🏗️ تحسين تماسك الأكوام أثناء التكديس. 💧 توزيع متساوٍ لمحلول السيانيد داخل الأكوام. 📉 تقليل الفقد في الجزيئات الدقيقة، مما يعزز استخلاص الذهب. 🌍 أهمية هذه العمليات: 🔹 زيادة كفاءة استخلاص الذهب عبر تحسين تماسك المواد الخام وتوزيع السيانيد. 🔹 تقليل الفاقد من الجزيئات الدقيقة أثناء النقل والمعالجة. 🔹 الالتزام بالاستدامة البيئية من خلال تقليل الغبار والنفايات المعدنية.

La importancia de un regadío segmentado en las rampas. Nos permite tener control para el frenado de los caex y a la vez nos ayuda a controlar la polución. Desde la instrucción de nuestros operadores hasta la ejecución en terreno, necesitamos ser consistentes en lo que hablamos y en lo que hacemos, siempre enfocados en generar las mejores condiciones en seguridad para operar y lograr nuestras metas. Confirmar nuestros procesos es clave para generar una cultura de mejoramiento continuo, vamos por más, siempre más.