1. PAINPOINT DRIVEN OPENING

Are your gold recovery operations constrained by inefficient primary crushing and grinding? Legacy stamp mills and undersized equipment create persistent bottlenecks that directly impact your bottom line. Consider these common challenges:
High Operational Costs: Excessive energy consumption per ton of ore processed and frequent, unplanned maintenance on worn stamps and dies drain profitability.
Inconsistent Throughput & Recovery: Variable feed size and manual adjustments lead to uneven particle liberation, causing valuable gold to be locked in oversized material or lost as fines.
Excessive Downtime: Lengthy, laborintensive die replacement and alignment procedures halt your entire milling circuit, costing thousands in lost production per hour.
Scalability Limitations: Older stamp mill designs cannot easily adapt to increased ore volume or harder ore bodies without major capital investment.

Is your operation achieving optimal tonnage and recovery rates from your primary grinding circuit? A modern, heavyduty bulk stamp mill for gold mining is engineered to address these exact issues.

2. PRODUCT OVERVIEW

The Bulk Stamp Mill is a mechanized, highcapacity gravityimpact crushing and grinding machine designed for the primary reduction of goldbearing quartz rock. It serves as the foundational workhorse in hard rock gold processing plants, transforming runofmine (ROM) ore into a granular sand for subsequent concentration.

Operational Workflow:
1. Feed Introduction: ROM ore (typically 6" to 8") is continuously fed via a regulated conveyor or feeder into the mortar box of the stamp mill.
2. Gravity Impact Crushing: Multiple mechanically lifted stamps (weighing 8002,000 lbs each) are sequentially dropped onto the ore bed within the mortar box, applying direct percussive force.
3. Particle Size Reduction: Ore is fractured by repeated impacts. Finer material passes through a perforated steel discharge screen at the mortar box's end, while larger pieces remain for further crushing.
4. Slurry Formation & Discharge: Crushed material exits as a slurry (when water is introduced) or dry sand, ready for transport to secondary grinding or direct concentration via shaking tables or sluices.

Application Scope & Limitations:
Scope: Ideal for freemilling gold ores where coarse gold liberation is possible at relatively large particle sizes. Best suited for mediumtohigh tonnage operations requiring robust, continuousduty primary crushing.
Limitations: Not suitable for ultrafine grinding requirements or highly refractory ores requiring chemical leaching at a very fine size. Performance is optimal with consistent feed size distribution.

3. CORE FEATURES

Modular Mortar Box Design | Technical Basis: Highcarbon steel segmented casting with replaceable liners | Operational Benefit: Enables rapid liner replacement in sections without dismantling the entire mill structure, reducing maintenance downtime by up to 70%. | ROI Impact: Direct labor cost savings and increased plant availability for production.

Precision Camshaft & Lifter System | Technical Basis: Forged steel camshaft with computerized numerical control (CNC)machined lift profiles | Operational Benefit: Ensures consistent lift height and timing for each stamp, promoting even wear distribution and stable power draw. | ROI Impact: Predictable maintenance scheduling extends component life by an average of 40%, lowering spare parts inventory costs.

Automated Lubrication System | Technical Basis: Centralized grease manifold with programmable intervals for all highwear bearings | Operational Benefit: Eliminates manual greasing points, ensuring critical components are lubricated during operation without operator intervention. | ROI Impact: Reduces bearing failure risk by over 60%, preventing costly secondary damage and unplanned stoppages.

Adjustable Discharge Screen Grid | Technical Basis: Quickrelease tensioning system for varied screen plate apertures | Operational Benefit: Allows operators to adjust final product size in under 30 minutes to optimize downstream recovery based on ore characteristics. | ROI Impact: Maximizes overall plant recovery rate by ensuring optimal feed size for concentration equipment.

HeavyDuty Foundation Frame | Technical Basis: Fabricated Ibeam steel structure with integrated vibration dampening mounts | Operational Benefit: Absorbs dynamic loads, protecting the mill's structural integrity and minimizing stress transfer to the plant floor. | ROI Impact: Eliminates costly concrete foundation repairs and extends the operational lifespan of ancillary equipment.

Water Injection Manifold | Technical Basis: Strategically placed nozzles for controlled slurry density management | Operational Benefit: Provides optimal moisture content to suppress dust and facilitate material transport through the crushing chamber. | ROI Impact: Improves working conditions (regulatory compliance) and enhances material flow efficiency by up to 25%.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Legacy Mills) | Bulk Stamp Mill Solution | Advantage (% Improvement) |
| : | : | : | : |
| Throughput (TPH)| Variable, often declining with wear| Consistent rated capacity maintained via wear compensation systems| +1525% Sustained Output |
| Stamp/Die Life| 200400 hours depending on ore abrasiveness| 550750 hours via proprietary alloy composition & hardening process| +80% Mean Time Between Failure |
| Energy Efficiency| High kWh/ton due to mechanical losses & imbalance| Optimized kinetic energy transfer with balanced rotating assembly| 20% kWh/Ton |
| Mean Time To Repair (MTTR)| 816 hours for major component changeover| <4 hours facilitated by modular design & toolless access panels| 65% Downtime Duration |
| Product Size Consistency (± target)| High variance affecting downstream processes| Low variance due to controlled drop height & screen regulation| +35% Size Uniformity |

5. TECHNICAL SPECIFICATIONS

Model Range Capacity: 10 – 150 Tons Per Hour (TPH), depending on ore hardness and target product size.
Power Requirements: Electric motor drive; 75 kW – 450 kW depending on model and stamp configuration (520 stamps).
Material Specifications:
Stamps: Forged steel core with replaceable highchrome alloy foot.
Mortar Box Liners: NiHard or Manganese Steel castings.
Frame & Structure: ASTM A36 Steel.
Physical Dimensions (Typical Large Model): Length: ~7m, Width: ~4m, Height: ~5m (excluding feed hopper).
Environmental Operating Range: Designed for ambient temperatures from 20°C to +50°C. Dust seals and protective coatings standard for highhumidity or mildly corrosive environments.

6. APPLICATION SCENARIOS

MidTier Gold Mine Expansion Project

Challenge A midtier operation needed to double its processing capacity but was limited by an antiquated, unreliable stamp mill that could not handle harder ore from a new vein.
Solution Installation of two highcapacity bulk stamp mills in parallel configuration was implemented as part of their plant upgrade plan.
Results Plant throughput increased by 120%. Maintenancerelated downtime decreased from approximately 15% to under 4% of operating time within one year postinstallation.

Artisanal & SmallScale Mining (ASM) Cooperative Consolidation

Challenge An ASM cooperative operating multiple small manual sites faced low overall recovery rates (<40%) due to inconsistent crushing across sites.
Solution A centralized processing facility was established around a single, automated bulk stamp mill with regulated feed conveyors.
Results The cooperative achieved a standardized crush size, improving overall recovery rates to consistently above 68%. The centralized operation also reduced environmental impact and improved safety oversight.

7. COMMERCIAL CONSIDERATIONS

Bulk Stamp Mill solutions are offered in three primary tiers:
1. Standard Duty Mill: For lowertonnage operations (<30 TPH) processing softer ores. Includes core features like modular mortar box and heavyduty frame.
2. Heavy Duty Mill: For mainstream operations (30100 TPH). Adds automated lubrication system precision camshafts as standard.
3. Plant Core Mill: For hightonnage flagship operations (>100 TPH). Includes full instrumentation package remote monitoring ports premium alloy components

Optional features include advanced vibration monitoring sensors wear analytics software packages fully enclosed sounddampening housings

Service packages range from basic preventative maintenance plans upto comprehensive performance contracts guaranteeing uptime availability

Financing options include capital lease operating lease project financing structures tailoredto mine development timelines

8 FAQ

What upstream crusher feed size is required?
The bulk stamp mill is designedfor primary reduction It accepts direct feed froma jaw crusher producing material typicallyminus sixto eightinches Consistent feed sizeis criticalfor optimal performanceand wear life

Can this equipment integratewith our existing ballmillorconcentrationcircuit?
Yes Field data showsthe bulkstampmill effectively reducesoretoasizesuitableasfeedforsecondaryballmillingordirectgravityconcentration Its adjustable discharge screen allowstuningtheproductsizetomatchyourexistingcircuit's requirements

Whatisthetypicalinstallationandcommissioningtimeline?
Forastandardmodel deliveryis typically14weeks Site installationandmechanical commissioningbytrainedtechnicians requires approximately tentofourteendays assumingfoundationprepworkiscomplete Electrical integrationdependsonsitespecifics

Areoperatortrainingandtechnicalmanualsprovided?
Comprehensive digitalandhardcopy technicalmanuals aresupplied We provideonsite operatorandmaintenancetechnician trainingaspartofthestandard commissioningprocess Additional virtualtrainingmodules arealso available

Whatkindofsparepartsinventoryshouldweplanfor?
We recommendaninitialsparepartskit containing criticalwearitems like onefullsetofmortarliners twosetsofstampfeetandkeybearingassemblies This supportsproactivemaintenancewithoutrelyingonemergencyshipping leadtimes