1. PAINPOINT DRIVEN OPENING

Are you managing gold recovery operations burdened by inconsistent throughput, high reagent consumption, and excessive downtime for liner changes? The limitations of conventional crushing and grinding circuits directly impact your bottom line. Consider these challenges:
Recovery Inefficiency: Coarse gold can be lost in traditional ball mill circuits, leading to a measurable decrease in overall yield.
High Operational Costs: Frequent maintenance cycles for complex grinding systems result in significant labor costs and production halts.
Scalability Issues: Modular or remote operations struggle with the footprint and infrastructure demands of standard milling setups.
Process Complexity: Integrating effective gravity recovery within a continuous flow sheet often requires additional, costly equipment.

What if a proven, robust technology could consolidate crushing and primary grinding while enhancing gravity recoverable gold (GRG) capture at the head of your circuit?

2. PRODUCT OVERVIEW: Industrial Stamp Mill for Gold Ore Processing

An industrial stamp mill is a mechanical crusher designed for the coarse liberation of gold from hard rock ore. It utilizes heavy, verticallylifted stamps that are repeatedly dropped onto ore fed into a mortar box, fracturing material through direct impact. This method is particularly effective for freemilling ores where gold is unlocked at a coarse size.

Operational Workflow:
1. Feed Introduction: Runofmine or primarycrushed ore (<50mm) is fed into the stamp mill’s mortar box.
2. Impact Crushing: Mechanically lifted stamps (5001000+ kg each) drop in a controlled sequence, pulverizing the ore against a hardened die.
3. Slurry Formation & Discharge: Water is introduced to create a slurry, which flows over an amalgamation plate (if used) and is discharged for further classification or secondary processing.

Application Scope & Limitations:
Ideal For: Freemilling gold ores, pilot plants, smalltomedium scale operations (150 TPD), historical site reprocessing, and operations prioritizing robust, lowtech reliability with high GRG recovery.
Limitations: Not suitable for refractory ores requiring fine grinding for chemical liberation. Higher energy per ton compared to some modern circuits for fine grinding. Requires consistent feed size control.

3. CORE FEATURES

Modular Frame Design | Technical Basis: Fabricated highstrength steel construction with prealigned bearing mounts | Operational Benefit: Simplifies transport to remote sites and reduces onsite assembly time by up to 40% | ROI Impact: Lower installation costs and faster commissioning accelerate project cash flow.

Interchangeable Stamp Shoes & Dies | Technical Basis: Cast manganese steel or alloy chrome iron components with standardized mounting | Operational Benefit: Operators can replace highwear items in under two hours without specialized tools, minimizing downtime | ROI Impact: Reduces planned maintenance windows by over 60% compared to relining traditional primary mills.

Integrated Amalgamation Recovery | Technical Basis: Mercurycoated copper plates within the slurry discharge trough | Operational Benefit: Captures free gold particles immediately upon liberation, acting as a highly efficient gravity concentrator at the crushing stage | ROI Impact: Field data shows a 515% increase in overall recovery by capturing coarse gold before it can report to tailings or become lost in downstream circuits.

Adjustable Discharge Grate | Technical Basis: Perforated steel grate with variable aperture control (312mm) | Operational Benefit: Allows realtime control of product topsize to optimize feed for downstream ball mills or concentrators | ROI Impact: Improves overall circuit stability and can increase downstream equipment throughput by ensuring optimal feed sizing.

Centralized Grease Lubrication System | Technical Basis: Manifoldfed lines to all major bearings from a single point | Operational Benefit: Enables safe lubrication during operation and ensures bearing longevity in dusty environments | ROI Impact: Extends critical component service life by an average of 30%, reducing spare parts inventory costs.

Simplified Kinematic Drive | Technical Basis: Direct gear or belt drive from electric motor to camshaft; fewer moving parts than complex grinding mill drives | Operational Benefit: Increases mechanical availability above 95%; maintenance personnel require less specialized training for repairs | ROI Impact: Lowers lifetime cost of ownership through reduced complexity and higher operational availability.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Small Jaw/Ball Mill Circuit) | Stamp Mill Solution | Advantage (% Improvement) |
| : | : | : | : |
| Gravity Gold Recovery at Primary Stage| Typically <5% GRG capture before cyanidation| 1530% GRG capture via amalgamation plates| +200% to +500% initial recovery |
| Mean Time Between Maintenance (Crushing/Grinding)| ~150250 hours for liner inspection/change| ~500 hours for shoe/die rotation or change| +100% operational uptime |
| Energy Consumption per Ton (Coarse Lib.)| ~1015 kWh/t (combined jaw/primary ball mill)| ~812 kWh/t (singlestage stamp duty)| Up to 20% reduction |
| Footprint per Ton of Capacity| Moderate to large for multimachine circuit| Compact, singleunit design for equivalent duty| Up to 35% smaller footprint |

5. TECHNICAL SPECIFICATIONS

Model Range & Capacity: Available in 3stamp (12 TPH), 5stamp (24 TPH), and 10stamp (58 TPH) modular units. Custom configurations available.
Power Requirements: Dependent on model; 22 kW to 75 kW electric motor drive, 400V/50Hz or customizable. Simple electromechanical starter.
Material Specifications: Frame: ASTM A36 Structural Steel. Stamps: Forged Steel Shafts with Manganese Steel Shoes. Mortar Box & Dies: HighChrome Cast Iron or Manganese Steel.
Physical Dimensions (5Stamp Unit): Approx. Length: 3.5m, Width: 2.2m, Height: 3m. Weight: ~12,000 kg.
Environmental Operating Range: Ambient Temperature: 20°C to +45°C. Designed for highdust environments. Water requirement for slurry formation: 13 m³ per ton of ore.

6. APPLICATION SCENARIOS

Artisanal & SmallScale Mining (ASM) Formalization Project

Challenge: A cooperative needed a simple, durable processing solution to replace manual crushing that could be operated locally with minimal training while maximizing immediate gold yield for cash flow.
Solution: Implementation of two modularized 3stamp mills with integrated amalgamation plates.
Results: Achieved consistent throughput of 1.8 TPH per unit with gravity recovery accounting for over 25% of total monthly gold production. Mechanical availability exceeded 96% in the first year.

Historic Tailings Reprocessing Plant

Challenge: Reprocessing old tailings required liberation of locked gold particles without overgrinding the material, which was already at a sand consistency.
Solution: A single 5stamp mill was installed as a regrind/scavenger device ahead of centrifugal concentrators.
Results: The adjustable discharge grate provided controlled light impacting action, successfully fracturing gangue without generating excessive fines. This increased overall plant recovery by 12% from the tailings feedstock.

7 COMMERCIAL CONSIDERATIONS

Pricing Tiers: Capital cost is modeldependent but typically offers a lower initial investment than an equivalent capacity jaw crusher/ball mill circuit.
Base Equipment Package includes mill frame drive motor stamps mortar box
Premium Package adds integrated amalgamation plates centralized lubrication system spare wear parts kit
Turnkey Package includes foundation drawings feed hopper slurry discharge sump and commissioning support

Optional Features: Dust enclosure kit dry feed capability alternative die metallurgies

Service Packages: Tiered annual maintenance contracts are available providing scheduled inspections wear part audits and priority technical support

Financing Options Flexible capital equipment financing can be structured through our partners including leaseto own arrangements tailored to project cash flow models

FAQ

Q What particle size range does an industrial stamp mill produce?
A A typical stamp mill circuit produces a discharge P80 ranging from approximately minus mesh depending on the ore characteristics discharge grate setting providing an ideal feed size for secondary ball milling or direct concentration

Q How does this integrate into my existing carboninleach CIL or carboninpulp CIP plant?
A The stamp mill acts as your primary grinder It should be placed after primary crushing Its discharge reports directly to your classification cyclone feed pump The key benefit is the removal of significant coarse gravityrecoverable gold before it enters your leaching circuit reducing retention time load on electrowinning cells

Q What are the safety considerations regarding mercury use in amalgamation?
A The use of mercury is optional and subject strict local regulations Our systems can supplied without plates include them as configurable option We provide documented procedures safe handling containment mandatory operator training if this feature selected recommend conducting thorough risk assessment first

Q What is expected operational noise level?
A Industrial stamp mills are machinery Significant noise generated impact Standard models operate approximately dB(A) at meters We offer acoustic enclosure kits reduce this dB(A)

Q Are spare parts readily available given this technology considered historical?
A Yes All our mills feature modern standardized components bearings seals wear parts No proprietary obsolete parts used Our global supply chain ensures week delivery most common wear items critical spares stock recommendations provided purchase

Q Can you test sample our ore determine suitability?
A Yes we offer benchscale testing using pilotscale unit provide detailed report projected liberation characteristics wear rates recommended configuration based your specific material