Acmc PDF: Complete Technical Guide

The quarry is where the cement plant begins: the open pit that feeds the limestone and the clay, the drilling and the blasting, the loading and the hauling, the crushing and the stockpiling: the quarry operation decides the cost and the chemistry of everything that follows: the raw mill can only grind what the quarry delivers, the kiln can only burn what the raw mill blends, and the quality of the clinker is settled long before the stone reaches the crusher: the ACMC PDF documents the complete quarry practice of the cement industry, and this article walks the file: the exploration, the planning, the extraction, the handling, the quality control and the safety of the quarry floor.

The Complete Cement Technical Package (931 files including the books, the courses, the Excel tools and the presentations: $249.99 one-time: instant download via the PayPal payment) includes this quarry and raw materials documentation together with the complete cement technology library: the one payment, the entire library of the cement plant, forever: this article follows the ACMC PDF: the working document of the quarry engineers, the drillers and the production planners: the reader gets the complete picture of the quarry operations in the order the industry practices them.

The quarry is the neglected department of the cement process: the crushing and the kiln get the engineers and the investments, and the quarry is often left to the experience alone: this guide brings the engineering discipline to the quarry: the exploration, the plan, the blasting design, the equipment, the quality, the environment and the safety: each section of this page mirrors the chapters of the file.

1. The Role of the Quarry in the Cement Process

The quarry is the first stage of the cement process, and its output defines the possibilities of the whole plant:

• The material supply: the cement plant consumes between 1.4 and 1.6 tons of the raw material per ton of the clinker: the 6000 tpd kiln line requires about 9-10 thousand tons of the raw material per day from the quarry: the continuity of the supply is the first duty of the quarry, and the interruption of the days costs the plant in the downtime;
• The chemistry of the deposit: the limestone provides the calcium carbonate, the clay and the marl the silica, the alumina and the iron: the chemistry targets of the raw mix (the LSF, the silica module, the alumina module) are limited by the deposit quality: the quarry plan must hold the chemistry of the delivered material within the limits the plant can correct;
• The contamination control: the overburden, the interlayers of the clay, the nodules of the chert, the high-magnesia zones: the quarry operating plan prevents the contamination of the good limestone with the harmful layers: the selective mining (the separation of the layers) is the quality instrument of the quarry: the file documents the contamination control of the cement quarries;
• The cost structure: the quarry costs the drilling, the blasting, the loading, the hauling and the crushing: the combined unit cost of the extraction typically runs from a small single-digit to a low double-digit USD per ton of the raw material depending on the overburden and the haul distances: the quarry is one of the largest controllable cost centers of the plant, and the engineering of the quarry reduces the cost per ton in the cents that multiply by the millions of tons.

The quarry is the foundation of the plant economics and the plant quality: the engineer who plans the quarry plans the whole process: the document opens with this perspective, and the sections below develop the practice of the cement quarry in the complete engineering detail.

2. The Exploration and the Reserve Evaluation: The Geology of the Deposit

The cement plant begins with the geology: the exploration of the deposit and the reserve evaluation decide the viability and the lifetime of the plant: the exploration practice of the cement industry:

• The geological mapping: the outcrop studies, the lithology, the strike and the dip of the strata: the mapping identifies the limestone formations, the clay beds and the waste zones: the geological map of the concession is the base document of the quarry planning: the file includes the mapping methodology and the documentation templates;
• The core drilling: the exploration boreholes on the grid (the 50-200 m spacing for the evaluation stage), the core recovery and the logging: the core samples sent for the chemical analysis: the CaCO3, the MgO, the SiO2, the alkalies along the depth: the drillhole plans and the logs: the file documents the core drill program planning and the sample handling;
• The reserve calculation: the classification of the resources into the measured, the indicated and the inferred reserves: the tonnage and the average chemistry per the block: the life of the mine (the years of the reserve at the plant capacity): the reserve to capacity ratio: the NPV of the deposit: the file includes the reserve calculation method with the example blocks and the quality distribution maps;
• The quality variability: the chemical variation of the deposit: the CaCO3 variations within the quarry: the exploration defines the expected standard deviation of the raw chemistry: the expected variation drives the blending design of the raw material handling: the high variability deposits require the more homogenization capacity in the plant: the file correlates the deposit variability with the process design;
• The hydrological and the excavation conditions: the groundwater level, the aquifer protection, the stability of the slopes: the dewatering of the quarry and the slope stability: the pit geometry: the file covers the geotechnical assessment and the water management of the quarry.

The exploration is the intelligence of the deposit: the thousand drill holes of the exploration save the million of the operation: the file gives the complete exploration campaign, the core logs, the reserve calculations, the chemistry statistics: the table follows the sequence that the cement companies practice, and the engineer can plan the exploration of a new quarry directly from it.

3. The Quarry Design and the Mining Plan

Once the geology is known, the quarry is designed: the geometry, the benches, the roads and the sequence: the design elements of the cement quarry:

• The bench design: the bench profile: the bench height of 10-15 m typical in the limestone quarries, the bench angle, the catch bench widths, the working slopes: blasting: the safe and the efficient benches: the file includes the pit geometry calculation and the design standards;
• The pit layout: the quarry pit geometry, the access ramps (the haul roads at the 8-10% gradient), the crusher position (the in-pit or the edge-of-pit crushers), the stockpile areas: the layout minimizes the haul distance, and the haul distance is the largest operational cost: the file includes the quarry layout optimization methods and the examples;
• The mining sequence: the order in which the benches advance: the sequence balances the material chemistry and the geometry: the winter levels, the summer levels: the sequence plan over the years with the production schedule and the reserve per period: the file includes the planning (the LOM: life-of-mine) templates of the cement quarry;
• The blending plan: the selective mining: the blend of the high-grade and low-grade zones in the proportion of the days: the face schedule that matches the target Lime Saturation: the file: the blend calculation of the quarry: the stockpiles of the quality classes: the correction and the mixing at source;
• The overburden and the waste: the removal of the topsoil and the clay overburden: the disposal areas and the reclamation: the stripping of the overburden and the cost: the file covers the overburden management and the closure planning (the rehabilitation of the quarry at the end).

The quarry design is the long-term engineering of the deposit: the file teaches the complete planning: from the reserve grid to the bench sequence: the document engineers of the file uses the quarry design the same way the designers plan the plant: the 20-30 year design horizon with the annual updates.

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4. The Drilling and the Blasting: The Primary Fragmentation

The limestone of the cement quarry is most often blasted from the solid rock: the drilling and the blasting break the bench into the fragments that the loader can handle: the blasting practice is the heart of the quarry operations:

• The drilling: the blastholes of 100-150 mm diameter in the typical cement quarry, the drill patterns (the single row, the multi-row, the square, the staggered), the burdens and the spacings, the hole depth and the sub-drilling: the drilling equipment: the rotary and the percussion drills: the file includes the drill hole pattern design and the drilling productivity targets;
• The explosive types: the ammonium nitrate fuel oil (ANFO) the standard, the emulsions modern practice, the cartridge explosives for the wet holes: the initiation systems (the non-electric detonators, the electronic detonators): the file: the explosive selection per the wetness and the rock: the primer and the initiation sequence design;
• The blast design: the powder factor (the kg of the explosive per ton of the rock, typically 150-400 g/t for the limestone), the stemming length, the charge per hole: the blast pattern design must achieve the fragmentation that the excavator and the crusher accept: the file includes the blast design calculation method with the worked examples;
• The blast results and the fragmentation: the muckpile analysis (the visual and the photographic), the oversized boulders (the secondary breaking): the fragmentation quality connect the blasting to the crusher energy: the file documents the fragmentation assessment and the correlation of the powder factor with the crushing cost;
• The vibration and the fly rock control: the blast vibration limits (the ppv: peak particle velocity at the neighboring structures), the fly rock prevention (the proper burden, the stemming), the air overpressure: the blast monitoring instruments: the file covers the vibration prediction formulas and the safe blast practices;
• The blasting safety: the explosive storage (the magazines, the security), the transport, the blast crew certification, the blast warning procedures, the “all clear” protocols: the blasting safety is the strictly regulated practice of the mine: the file includes the complete safety rules of the blasting operations.

The blasting creates the condition for every following operation: the fragmentation determines the loader productivity, the crusher energy and the throughput: the file teaches the complete blasting: the drilling, the charging, the initiation and the safety: the blasting engineers of the plant use the file at the blast planning stage: the complete drawings and the tables are inside.

5. The Loading and the Hauling: Moving the Rock

After the blast, the broken rock is loaded and hauled to the crusher: the loading and the hauling are the largest cost of the quarry, and the equipment selection decides the unit cost:

• The loading equipment: the hydraulic excavators (the backhoes) and the wheel loaders: the excavator bucket of 5-15 t capacity at the main faces, the loader for the stockpile reclaim and the crusher feed: the file includes the loading equipment selection tables: the match of the bucket with the truck size;
• The hauling fleet: the rigid haul trucks (the 40-100+ ton class) and the articulating trucks in the smaller operations: the truck cycle time: the load, the haul, the dump: the fleet size calculation: the number of the trucks per excavator (the “truck fleet ratio”): the file includes the truck cycle calculation and the fleet planning;
• The haul roads: the road design: the gradient 8-10%, the crossfall, the drainage, the roadbed: the truck speed: the road maintenance: the dead: the muck: the file includes the road standards of the quarry: the road condition directly affects the tire wear (upto 50% of the tire cost) and the truck productivity;
• The in-pit crushers and the conveyors: the modern operations crush at the face and convey the product to the plant: the semi- and fully mobile in-pit crushers, the conveyor belt: the elimination of the truck highway: the energy and the cost: the trade-off of the capital vs the operating: the file covers the crushing-in-pit evaluation method;
• The machine utilization and the KPIs: the availability, the utilization, the mechanical availability of the fleet: the tracking of the (t/ha, the downtime): the fleet management software and the GPS: the KPI dashboard that the quarry manager watches: the file includes the machinery KPI definitions and the reporting templates;
• The maintenance of the equipment: the preventive maintenance of the excavators, the trucks, the crushers: the planned downtime vs the breakdown: the file includes the maintenance schedule: the spare parts and the workshop organization of the quarry.

The equipment is the muscle of the quarry: the file covers the complete machinery practice: the selection, the cycles, the roads, the conveyors and the KPI: the cost per ton is the sum of the equipment costs, and the file teaches where the optimization lives: in the one percent improvements of the availability and the utilization.

6. The Primary Crushing: From the Muckpile to the Mill Feed

The quarry rock is reduced by the primary crusher before the raw mill: the crushing is the boundary between the quarry and the plant: the crushing practice:

• The primary crushers: the gyratory, the jaw and the impact crushers: the selection by the feed size (the blasted rock up to 1.5 m), the rock abrasiveness, the required product: the impact crushers for the limestone, the gyratory for the hard rock: the file includes the primary crusher selection criteria and the capacity;
• The crusher operation: the feed rate, the chamber setting, the gradation: the blasting coordination with the crusher: the feed consistency: the crusher block (the oversized boulders, the bridging) and the rapier: the file: the crusher operation and the troubleshooting:
• The wear and the maintenance: the jaw plates, the mantels, the hammers: the wear lifetime in the tonnes of the crushed: the replacements and the costs: the file: the wear parts tracking and the life improvement: the metal detectors and the magnetic separators: the tramp protection of the crusher
• The crusher dedusting: the dust at the crusher: the water sprays, the bag filters: the fugitive dust and the ambient: the file: the crushing building ventilation and the dust control practice:
• The crusher product: the size distribution of the crusher output (the typical minus 100-150 mm) delivered to the raw material store: the homogeneity of the crusher feed (the blending of the stockpiles at the transfer) and the quality management of the crusher day: the file includes the crusher product specification and the quality checks.

The crushing is the size reduction of the blasted rock, and its cost is tied to the blasting quality upstream: the poor blast (the coarse muck) loads the crusher with the energy: the best fragment is the cheapest to crush: the file teaches the crusher practice: the selection, the operation, the wear, the dust and the coordination with the blasting.

7. The Stockpiles and the Homogenization at the Quarry

The quarry engineering does not end at the crusher: the material must be stored and homogenized before the raw mill: the stockpile design and the blending:

• The cone and the linear stockpiles: the simple storage of the crushed rock: the windrow (the Chevron) stockpiles: the circular and the longitudinal: the volume, the reclaim: the file brings the stockpile geometry, the storage capacity and the equipment:
• The prehomogenization: the layered storage: the stacker builds the horizontal layers, the reclaimer cuts them vertically: the mixing effect of the 2:1 to 5:1 for the stacker-reclaimer (called the blending factor): the raw material homogenization before the mill reduces the raw meal variation: the file: the homogenization factor of the pre-homogenizing store;
• The quality classes: the high-grade limestone, the low-grade limestone: the separate stockpiles for the correction: the reclaim blending by the proportion of the faces: the quality management: the file, the stockyard quality planning;
• The reclaim equipment: the bridge reclaimer, the scraper reclaimer, the door feeders: the operation and the reliability: the file: the reclaimer operation and the maintenance;
• The stockpile management: the moisture, the wind, the segregation: the dust generation in the thin dumping: the file: the environmental management of the bulk storage: the watering and the berms.

The quarry-side homogenization is the first stage of the chemical correction: the electric: the stacking: the reclamation makes the raw feed to the mill more uniform: the file covers the complete stockpiling and the pre-homogenization: the design, the equipment and the operation: the quality that the raw meal system receives tomorrow begins on these stockpiles today.

8. The Quality Control of the Quarry: Sampling and the Chemistry in the Pit

The quarry quality control measures the chemistry before the material enters the plant process: the quarry laboratory and the sampling practice:

• The sampling system of the quarry: the face samples with the geological control: the drill cuttings, the blast muckpile samples, the crushed product sampling: the automatic samplers at the belt: the daily chemistry of the delivered limestone: the file covers the complete sampling chain and the sampling frequencie;
• The analysis: the quick lime titration (the CaCO3 determination) at the pit laboratory for the instantaneous control; the XRF for the complete suite: the MgO, which must be watched under the limit of the cement (the high-magnesia limestone zones): the file: the pit laboratory equipment and the analysis methods;
• The grade control: the blast hole chips geochemistry, the “grade control” drilling: the planned blast: the expected chemistry of every blast load: the reconciliation of the planned vs the mined: the file: the grade control workflow with the data transfer to the planner;
• The chemical blocks of the quarry plan: the mine plan blocks, the chemistry per block, the target blend: the average chemistry of the daily production: the deviations and the plant: the online quality: the file includes the block model and the daily quality report templates;
• The correction and the CRM: the corrective materials (the iron ore, the sand, the gypsum occasionally): the addition of the correction at the raw mill: the correction requirements from the quarry chemistry: the file: the corrective material dosing and the quality integration.

The quality control of the quarry is the first downstream quality control of the process: the file: the sampling, the analysis, the control: raises the same question as the whole document: what gets measured, gets managed: the chemistry that arrives at the raw mill limits the chemistry the kiln feeds: the quarry QC is the frontier of the whole quality system.

9. The Environment and the Rehabilitation: The Quarry in the Community

The cement quarry is a temporary use of the land, and the modern practice plans the environment from the day one: the environmental management of the quarry:

• The dust control: the blasting dust, the crushing dust, the haul road dust: the water sprays, the watering trucks, the misting systems: the dust monitoring (the ambient dust measurement at the boundary): the file: the dust suppression systems of the quarry operations;
• The noise and the vibration: the blasting vibrations and the noise of the equipment: the blast timing restrictions, the noise barriers: the monitoring and the community relations: the file: the blast vibration monitoring: the complaints and the resolution procedures;
• The water management: the pit dewatering (the sumps, the wellpoints), the settling ponds, the water quality around the quarry: the silt control in the runoff: the file: the water management plan of the quarry;
• The blasting and the protected areas: the blast design in the vicinity of the habitats, the archaeological sites and the communities: the special conditions and the approvals: the file: the cumulative assessment practice;
• The progressive rehabilitation: the backfilling, the re-soiling, the slope re-vegetation: the progressive reclamation of the mined-out benches: the quarry closure plan: the post- closure land use (the lakes, the parks, the agriculture): the file: the rehabilitation program and the case histories of the industry.

The quarry is the tenant of the landscape and the environment of the community: the file: the sustainable practice of the cement quarry: the mitigation hierarchy (avoid, minimize, restore, compensate): the complete environmental chapter: the quarry of the 21st century plans the beginning of the final state: the day the trucks stop and the pit becomes what the community receives.

10. The Safety of the Quarry Operations

The quarry is one of the most hazardous workplaces of the cement plant: the blasting, the heavy equipment, the slopes and the dust: the safety management of the quarry:

• The blasting safety: the magazine storage, the firing procedures, the exclusion zone (the blasting danger lines), the sending the “all clear”: the misfire procedure (the waiting period, the re-entry): the file: the blasting safety standard: the most detailed chapter of the quarry safety;
• The equipment safety: the truck and the excavator interaction (the goldline, the spotter), the seatbelt rules, the right: the pedestrian exclusion from the working zones: the file: the working procedures of the vehicle interactions and the traffic management in the pit;
• The slope stability: the geotechnical monitoring of the high walls, the slope failures and the failure shearing: the slope stability assessment of the design benches: the monitoring (the prisms, the radar) of the risky faces: the file: the geotechnical safety of the quarry;
• The health of the workforce: the dust exposure (the silicosis risk of the quartz-bearing rocks), the noise exposure, the vibration (the HAVS: hand-arm for the drill), the PPE: the medical surveillance: the file: the occupational health program of the quarry;
• The emergency planning: the rescue of the remote areas, the first aid (the injured during the blasting), the communicators, the escape routes: the drill practices: the file includes the emergency response plans and the drills of the quarry;
• The safety culture: the safety audits, the near-miss reporting, the tool-box talks: the safety culture: the file: the safety management system of the quarry: the implementation of the behavioral safety program.

The safety of the quarry is not the regulatory compliance, it is the way the work is organized: the file treats the quarry safety topographies: the risks and the controls, the procedures and the audits: the professional of the quarry follows the same answer: the safe quarry is the productive quarry, and the two are not in the conflict: they are the same.

11. The Quarry Economics: The Cost and the Productivity Management

The quarry is a continuing operation with the distinct cost structure, and the quarry engineer manages the costs like the plant general manager:

• The cost structure of the ton: the drilling (10-20%), the blasting (15-25%), the loading (10-15%), the hauling (25-40%), the crushing (15-25%): the cost allocation of the quarry: the file includes the cost structure tables of the industry and the components;
• The unit cost tracking: the costs measured per ton of the extracted and the delivered: the trend of the unit costs: the budgets versus the actual: the file includes the quarry cost sheet template;
• The productivity benchmarks: the drilling productivity (the meters per hour), the blast tonnes per blasthole, the excavator (tons per hour), the truck (tons per km per hour), the crusher (tons per hour): the benchmarks of the quarry and the takt:
• The optimization levers: the haul distance reduction, the fragmentation improvement, the fleet utilization, the conveyor transfer: the file: the optimization case studies: the haul and the crushing; the energy: the decision:
• The reporting: the shift reports, the daily production reports, the monthly cost and production review: the KPI dashboards of the quarry: the file includes the reporting system of the quarry and the Q report.

The quarry economics are the sum of the small optimizations: the file teaches the cost and the productivity management: the benchmarks, the KPIs and the improvement program: the quarry that optimizes the cost keeps the plant competitive at the kilogram level: the circular costs of the quarry reach the price of the cement and the market.

12. The Quarry in the Future Cement Plant: The Automation and the Digitalization

The cement quarries are transforming with the automation and the digitalization at a speed the industry has never seen:

• The autonomous haulage trucks: the autonomous dump trucks operated by the control room: the pilot projects and the commercial operations in the mining: the cement quarries: the feasibility: the safety: the file: the automation maturity model and the deployment cases;
• The drill automation and the drone surveys: the drones for the volume surveys, the slope monitoring and the stockpile inventories: the semi-autonomous drilling: the file: the drone practice and the survey data management:
• the dispatch systems: the fleet management and the dispatch software allocates the trucks and the excavators in the real time: the blended: the productivity gains of 5-15%: the file: the exit: the dispatch implementation:
• The digital geology and the block models: the geological modeling software, the Lefebvre (the block models), the the grades: the mine planning packages: the continuous: the digital resource model: the file: the digital mine planning practice;
• The equipment telemetry: the machine data: the OEE, the availability, the condition: the predictive maintenance of the trucks: the file: the telemetry project and the maintenance optimization;
• The quarry of the future: the carbon: the electric equipment (the electrical trucks), the carbon and the dust autonomy: the community: the “mine of the future” the file describes the transformation paths honestly with the maturity and the economics.

The quarry of the future: the automation, the digitalization: the file closes with the technology outlook (and takes stock): the cement quarry has been the analog Outpost for too long: the technologies of the article reduce the cost, improve the safety and the sustainability of the operation: the engineer of the cement: the quarry is going digital, and the file brings the roadmap.

The Frequently Asked Questions

What is the difference between the exploration sampling and the production sampling?

The exploration sampling targets the deposit (the drill cores, the wide grid, the geological formation characterization) and it builds the reserve model: the production sampling targets the daily, hourly material flow: the blast piles, the crusher feed, the loaded trucks: the two sampling systems serve the two purposes: the exploration decides the mine plan, the production sampling decides the process control: the file covers both: the spacing, the method, the analysis.

How does the quarry influence the cement quality?

The quarry delivers the chemistry (the CaCO3, MgO, the alkalies) and the variability of the raw material: the raw mill and the blending can correct the limited variation: the too high MgO in the limestone, the excess alkalies: the clinker phases and the cement performance: the contamination (the refractory pieces, the chert): the grinding and the quality: the chemical and the physical: the quarry floor decides the boundaries of the possible cement quality: the quarry is the first department of the quality system.

What are the special quarry operations for the blasting?

The special operations: the presplitting (the controlled production of the slopes), the cushion blasting (the light charge near the structures), the trench blasting, the underwater blasting, the break-blasting of the oversized: the cement quarries: the presplitting and the normal production blasting are the most common, and the special operations are documented in the file with the design criteria and the safety requirements: the blasting near the plants: the special: the vibrations.

What equipment does the quarry need for the 6000 tpd cement plant?

A typical config: the 2-3 chargers: the excavators of the 60-90 ton class as the main loading, the fleet of the 60-100 ton rigid trucks (the 8-12 units on the cycle), the drill rigs in the bench conditions and the primary crushers in the 1000-1500 tph class sized for the plant capacity, the belt: the prehomogenizing stackers and the reclaimers: the numbers, the load factor and the utilization: the file gives the equipment selection calculations for the complete plant scenarios.

What is the principle behind the prehomogenization of the raw materials?

The prehomogenization reduces the material variation: the stacker lays down the material in the thin horizontal layers; the reclaimer cuts the stack vertically, averaging the layers: the outlet chemistry: the mean of the inlet layers: the homogenization factor of 2:1 to 5:1 for the typical Chevron stores: the prehomogenization of the raw material is the first blending of the process, and the raw meal homogenization later completes the job: the two together deliver the stability the kiln needs.

Where are the spare parts for the earthmovers and the quarry equipment in the package?

The Complete Cement Technical Package contains the whole cement plant library: the runfile (the quarry section), the equipment manuals of the cement machinery, the crushing and the material handling guides: the one payment: the library: the unit – the spare parts lists: the suppliers’ catalogues are not included because the package holds the knowledge of the process and the equipment, not the proprietary documentation of the vendors: the plant uses the package to specify, order and manage its machinery independently: the quarry: the package: the complete cement plant in the 931 files.

This file is part of the Complete Cement Technical Package (931 files) available from cementequipment.org. Respective rights holders; library copy for the licensed single user.