1. PAINPOINT DRIVEN OPENING

Are you managing a gold processing operation where throughput, recovery rates, and operational costs are under constant pressure? The primary crushing and grinding stage is often a bottleneck, with direct implications for your entire plant's profitability. Common challenges include:

Excessive Downtime for Maintenance: Frequent liner changes and mechanical failures in crushing/grinding equipment halt production. Industry data indicates unscheduled downtime in this stage can cost over $15,000 per hour in lost production for a midsized operation.
SubOptimal Gold Liberation: Inconsistent particle size from the primary grinding circuit limits cyanide leach efficiency, trapping fine gold within larger ore particles and reducing overall recovery.
High Energy Consumption per Ton: Older milling technology consumes disproportionate power relative to throughput, making energy one of the largest variable costs in mineral processing.
Scalability Limitations: Inflexible equipment cannot efficiently handle fluctuating ore grades or hardness without significant manual adjustment and process compromise.
Environmental & Safety Concerns: Dust generation from dry crushing and noise pollution present ongoing compliance and workforce health challenges.

Is your current solution delivering consistent throughput while controlling wear costs and energy use? Can your primary grinding circuit adapt to variable ore without sacrificing recovery? This is where a modern, engineered stamp mill solution provides a definitive answer.

2. PRODUCT OVERVIEW

The modern HeavyDuty Gravimetric Stamp Mill is a robust, mechanized milling system designed for the primary crushing and coarse grinding of goldbearing ore. It serves as the critical first stage in size reduction, liberating gold particles for subsequent concentration or leaching processes.

Operational Workflow:
1. Feed Introduction: Runofmine (ROM) ore is fed into a centralized hopper, typically via conveyor from a primary jaw crusher.
2. Controlled Milling: Ore is gravityfed into individual mortar boxes. Mechanized stamps (weighted heads) are lifted and dropped in a continuous cycle, pulverizing the material through impact.
3. Slurry Discharge: Crushed ore mixes with water introduced into the mortar box to form a slurry, which passes through a discharge screen.
4. Classification & Forward Feeding: The slurry, now at target size (typically 10mm to 2mm), flows by gravity to downstream processes like ball mills or concentrators.

Application Scope & Limitations:
Ideal For: Mediumscale gold processing plants (50500 TPD), operations with hard/abrasive quartz ores, regions with limited grid power favoring mechanical drive systems, and projects requiring robust, lowcomplexity machinery.
Limitations: Not suitable for ultrafine grinding (<150 microns). Maximum capacity is constrained by physical stamp size and frequency. Requires consistent ore feed size from preceding crushing.

3. CORE FEATURES

Modular Mill Frame | Technical Basis: Fabricated highcarbon steel frame with independent mortar box modules | Operational Benefit: Allows for maintenance or replacement of individual mortar boxes without shutting down the entire mill bank. | ROI Impact: Reduces planned maintenance downtime by up to 40% compared to monolithic designs.

TungstenCarbide Reinforced Stamp Heads | Technical Basis: Wear surfaces fused with tungstencarbide inserts in a highmanganese steel body | Operational Benefit: Increases service life by 35x compared to standard manganese steel heads in abrasive ore applications. | ROI Impact: Lowers consumable parts cost per ton crushed by approximately 60% and reduces changeout frequency.

Variable Drop Frequency Drive System | Technical Basis: PLCcontrolled hydraulic or electric drive allowing adjustable stamp cycle speed (48 RPM) | Operational Benefit: Operators can finetune impact energy and throughput based on realtime ore hardness feedback from upstream crushers. | ROI Impact: Optimizes energy consumption and improves final grind consistency for leaching, boosting potential recovery by 24%.

Integrated WaterJacketed Mortar Boxes | Technical Basis: Sealed water channels cast into the exterior walls of each mortar box | Operational Benefit: Dissipates heat generated during continuous milling, protecting bearing assemblies and reducing thermal stress on components. | ROI Impact: Extends major bearing service intervals by an estimated 30%, lowering longterm overhaul costs.

Centralized Grease Lubrication System | Technical Basis: Automated manifold delivering precise grease amounts to all major bearing points on a timed cycle | Operational Benefit: Eliminates manual lubrication points, ensuring optimal component health and reducing contamination risk. | ROI Impact: Decreases bearingrelated failures by over 70% while improving site safety.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Legacy Stamp/Ball Mill) | Modern Stamp Mill Solution | Advantage (% Improvement) |
| : | : | : | : |
| Availability / Uptime | ~85%, frequent liner/stamp changes | ~93%, modular design & hardened wear parts| +9% (More productive hours) |
| Energy Efficiency (kWh/ton) | High variance; ~57 kWh/ton for primary grind| Consistent ~45 kWh/ton with variable drive| Up to +28% (Lower OPEX) |
| Wear Part Cost ($/ton processed)| $0.85 $1.20 for standard manganese parts| $0.35 $0.55 with carbidereinforced parts| ~+55% (Lower consumable cost) |
| Particle Size Consistency (% within target range)| 6575% due to uncontrolled impact energy| 8088% via adjustable drop frequency & screen control| +15% (Better liberation for downstream recovery) |

5.TECHNICAL SPECIFICATIONS

Model Range & Capacity: Available in 5Stamp to 20Stamp configurations; Throughput from 25 TPD to over 500 TPD depending on ore hardness and feed size.
Power Requirements: Electric motor drive options from 75 kW to 450 kW total installed power (3phase). Hydraulic drive systems available for remote sites.
Material Specifications: Mill Frame: ASTM A36 Steel; Stamps & Liners: High Manganese Steel with optional Tungsten Carbide inserts; Mortar Boxes: HighChrome Cast Iron.
Physical Dimensions (10Stamp Unit): Approx. Length: 8m x Width: 3m x Height: 4m (excluding feed hopper).
Environmental Operating Range: Designed for ambient temperatures from 20°C to +50°C; Dust suppression system maintains compliance in enclosed buildings; Noise dampening shrouds available.

6 APPLICATION SCENARIOS

West African Hard Rock Gold Mine | Challenge: A mine processing highly abrasive quartzite ore faced unsustainable wear part costs and weekly downtime on their primary ball mill circuit.| Solution: Installation of two parallel 10stamp mills with tungstencarbide reinforced components as the primary grinding stage ahead of existing cyanidation tanks.| Results: Wear part lifecycle extended from 7 days to over 35 days. Plant availability increased by 11%. Combined savings in parts and increased production delivered an ROI on the stamp mills in under 14 months.

Latin American Artisanal / SmallScale Mining Cooperative Upgrade | Challenge:The cooperative used manual "arrastras" leading to inconsistent grind size (85% liberation at steadystate capacity of over fifty tons per day.Gold recovery rates improved dramatically while eliminating open mercury use.The plant became an approved regional processing center generating revenue via toll milling services

North American Historic Tailings Reprocessing Project Challenge:A project aimed at recovering gold from historic sulfide tailings required robust but flexible primary crushing capable of handling variable cemented material without blinding Solution:A customdesigned eightstamp mill equipped with extrafine discharge screens was implemented as the head of the reprocessing circuit replacing an unreliable hammer mill Results:The stamp mill's gravityimpact action effectively broke up cemented aggregates without generating excessive fines that would report directly to slimes ponds Metallocked particle liberation improved allowing subsequent flotation recovery rates exceeding initial project feasibility estimates

7 COMMERCIAL CONSIDERATIONS

Our stamp mill solutions are offered under three main tiers:

1.Standard Production Model: Includes core modular frame hardened steel stamps basic drive motor central lubrication Ideal for operations with stable ore characteristics
2.HighAbrasion Package: Upgrades include full tungstencarbide stamp heads highchrome mortar boxes enhanced dust sealing Recommended for quartzdominant or highly abrasive ores
3.Remote Operations Package: Features integrated hydraulic drive standalone power generation capability advanced predictive monitoring sensors For sites with limited grid access or requiring maximum autonomy

Optional features include automated feed control systems advanced vibration monitoring packages sound attenuation enclosures

Service packages range from basic commissioning support through comprehensive multiyear maintenance agreements including scheduled inspections wear part supply priority technical support

Financing options are available including straight equipment purchase capital lease agreements or leasetoown structures Projectspecific financing can be structured based on validated throughput guarantees

8 FAQ

Q What upstream crusher is required before feeding ore into your stamp mill?
A Our mills are designed to accept feed material ideally sized at minus two inches (50mm). A standard jaw crusher or small gyratory crusher is typically sufficient as primary preparation equipment

Q How does particle size output compare between different models?
A Output size is primarily controlled by the discharge screen aperture not the number of stamps All models can be configured with interchangeable screens typically ranging from ten millimeters down two millimeters The number of stamps determines total throughput capacity not final product fineness

Q Can these mills be integrated into an existing carboninleach CIL plant?
A Yes they serve as an effective primary grinding unit ahead of secondary ball milling Field data shows that using our stamp mill reduces load on subsequent ball mills often allowing increased overall plant throughput or finer final grind within existing energy budgets

Q What are typical installation requirements?
A Installation requires prepared concrete foundation adequate overhead crane capacity within building structure supply process water connection slurry discharge sump Electrical connection must match motor specifications detailed engineering drawings are provided prior purchase facilitate planning

Q What warranty coverage provided?
A We offer twentyfour month warranty manufacturing defects twelve months coverage wearable components like stamps liners Warranty requires adherence recommended maintenance procedures use genuine spare parts Warranty extensions available through service agreements