1. PAINPOINT DRIVEN OPENING

Are you managing a gold processing operation where throughput and recovery rates are under constant pressure? The challenges of hard rock gold liberation are significant. Many operations face high perton processing costs due to inefficient particle size reduction, excessive energy consumption from outdated crushing methods, and unplanned downtime from equipment not built for continuous, abrasive service. Furthermore, inconsistent grind size can directly compromise cyanidation or gravity recovery efficiency, leaving valuable material in the tailings.

Are you experiencing:
High Operational Cost: Energyintensive primary crushing that creates excessive fines before milling even begins?
Recruitment & Retention Issues: Difficulty finding and keeping skilled personnel to run and maintain complex, temperamental milling circuits?
Inconsistent Liberation: Variable ore hardness leading to poor control over final grind size and suboptimal gold recovery?
Frequent Maintenance Stops: Unplanned breakdowns of undersized or improperly specified equipment halting your entire processing line?

The right stamp mill for gold mining addresses these core issues by providing a robust, mechanically simple, and highly effective solution for coarse gold liberation and primary ore reduction.

2. PRODUCT OVERVIEW: HeavyDuty Gold Stamp Mill

A modern gold stamp mill is a specialized piece of mineral processing equipment designed for the coarse crushing and preliminary liberation of goldbearing quartz rock. It operates on the principle of repetitive dropping of heavy weights (stamps) onto ore fed into a mortar box.

Operational Workflow:
1. Feed Introduction: Runofmine (ROM) or primarycrushed quartz ore is fed into a steel or cast iron mortar box.
2. Mechanical Percussion: Powered by a central camshaft, multiple heavy steel stamps (5002000 lbs each) are lifted in sequence and dropped onto the ore.
3. Particle Reduction & Amalgamation: The repeated impact fractures the rock. Optionally, mercury can be introduced in the mortar box to form a gold amalgam during crushing.
4. Slurry Discharge: Crushed material is washed through a fine screen at the mortar box discharge with a continuous water flow, creating a slurry for further processing (e.g., concentration tables, cyanidation feed).

Application Scope & Limitations:
Ideal For: Small to mediumscale operations targeting coarse freemilling gold, historical mine restarts, remote sites with limited technical labor, and operations where simplicity and reliability are paramount.
Limitations: Less energyefficient than ball mills for fine grinding (<100 mesh). Not suitable for refractory ores requiring ultrafine liberation. Amalgamation practices require strict environmental and safety controls.

3. CORE FEATURES

Modular Frame Design | Technical Basis: Fabricated highcarbon steel Ibeam construction with bolted sections | Operational Benefit: Enables transport to remote sites and simplifies onsite assembly without heavy welding | ROI Impact: Reduces installation time by up to 40%, lowering initial setup capital

Forged Alloy Steel Stamps | Technical Basis: Heattreated chromiumsteel alloy for maximum abrasion resistance and impact strength | Operational Benefit: Stamp life increased by over 300% compared to mild steel, maintaining consistent weight for uniform impact force | ROI Impact: Direct reduction in consumable parts cost and associated downtime for replacement

Centralized Grease Lubrication System | Technical Basis: Automated manifold delivering grease to all major bearing points (camshaft, lifters, guides) | Operational Benefit: Eliminates manual greasing points, ensuring optimal bearing life and preventing failures due to human error | ROI Impact: Reduces bearingrelated downtime by an estimated 60% and extends major overhaul intervals

Variable Speed Drive (Optional) | Technical Basis: Frequencycontrolled electric motor driving the camshaft | Operational Benefit: Allows operators to finetamp rate (stamps per minute) based on realtime ore hardness and feed size | ROI Impact: Optimizes throughput and particle size distribution; field data shows a 1525% improvement in throughput when matching speed to ore characteristics

Replaceable Wear Liners | Technical Basis: Boltin manganese steel liners for mortar box interior | Operational Benefit: Protects the main mortar box structure; worn liners can be replaced in hours versus days for rebuilds | ROI Impact: Extends the service life of the core asset by decades; reduces maintenance complexity

Integrated Water Flow System | Technical Basis: Preplumbed manifold with adjustable valves at each mortar box discharge | Operational Benefit: Provides consistent slurry density control critical for downstream processes like gravity concentration | ROI Impact: Improves overall recovery circuit stability; minimizes water waste through controlled application

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Basic Stamp Mill) | Our HeavyDuty Stamp Mill Solution | Advantage (% Improvement) |
| : | : | : | : |
| Stamps per Minute Stability| +/ 10% fluctuation with load variance| +/ 2% fluctuation via balanced flywheel & drive| 80% more consistent operation |
| Tonnage per Stamp Wear| ~500 tons processed per stamp dress/refurbish| ~1,800 tons processed with forged alloy stamps| 260% increase in wear life |
| Energy per Ton Processed| Reliant on lineshaft designs with higher friction losses| Optimized gear drive & bearing system reduces parasitic loss| Up to 18% lower kWh/ton |
| Mean Time Between Failure (Major)| ~4,000 operating hours| >7,000 operating hours before major bearing/cam service| 75% longer service intervals |
| OnSite Assembly Time| 34 weeks with extensive field welding & alignment| 1012 days with prealigned modular frame sections| ~60% faster commissioning |

5. TECHNICAL SPECIFICATIONS

Model Range Capacity: 1 – 10 Tons Per Hour (TPH), depending on ore hardness and target grind.
Power Requirements: Electric motor driven; range from 15 HP (single stamp pilot unit) to 75 HP (5stamp production unit). Diesel power options available.
Material Specifications:
Frame: ASTM A36 Structural Steel
Stamps: AISI 4140 Alloy Steel, Forged & HeatTreated
Mortar Box Liners / Dies: Hadfield Manganese Steel (1114%)
Camshaft & Lifters: Induction Hardened Carbon Steel
Physical Dimensions (5Stamp Unit):
Length: ~6m
Width:~2.5m
Height:~3m
Approximate Weight:~12,000 kg
Environmental Operating Range: Designed for operation from 20°C to +50°C ambient temperature. Enclosed gear drive protects from dust ingress.

6. APPLICATION SCENARIOS

SmallScale Mine Expansion & Mechanization

Challenge:A West African artisanal mining cooperative was manually crushing ore with hammers, achieving less than 0.5 TPH with poor recovery consistency.
Solution Implementation:A singlestamp mill was installed as their primary crusher/liberator unit feeding directly onto shaking tables.
Results:The operation achieved consistent throughput of over one ton per hour—a fourfold increase—with documented recovery improvements due to uniform particle sizing.

Historical Tailings Reprocessing Plant

Challenge:A contractor reprocessing old mill tailings needed a rugged primary crusher capable of handling agglomerated material containing mercury residues without frequent clogging or maintenance stops.
Solution Implementation:A threestamp mill replaced a small jaw crusher that was suffering from constant liner wear and bridging issues.
Results:The stamp mill's percussive action effectively broke apart the cemented tailings lumps without clogging.The simplified mechanical design resulted in weekly maintenance time being reduced from over ten hours to under two.

Remote Exploration Site Bulk Sampling

Challenge:A mineral exploration company required reliable onsite bulk sampling capability at a drill site with no grid power or skilled mechanics.
Solution Implementation:A dieselpowered twostamp mill package was airtransported modules assembled onsite within five days.
Results:The team processed over five hundred tons of selected drill core material reliably over six weeks establishing grade continuity without transporting samples offsite saving significant time cost.

Commercial Considerations

Equipment pricing tiers are based on capacity configuration:
Pilot/Sampling Units(12 stamps):Entrylevel pricing suitable for definitive feasibility studies bulk sampling
Standard Production Units(35 stamps):Core range offering optimal balance throughput footprint most small medium operations includes basic lubrication motor starter
Custom HighCapacity Units(6+ stamps):Engineered specific highvolume applications often includes integrated feed conveyors advanced slurry handling systems

Optional Features:
Variable Frequency Drive(VFD)for speed control.Diesel power pack.Dust suppression shrouding.Automated amalgam collection trays.Stainless steel contact parts for specific chemical conditions.

Service Packages:
1.Basic Commissioning Package(Field assembly supervision operator training)
2.Planned Maintenance Agreement(Scheduled inspections parts kits priority support)
3.Full Service Contract(Covers all parts labor scheduled unscheduled repairs fixed annual cost)

Financing Options:
Commercial buyers can access equipment financing through partner institutions including:
–36–60 month leasetoown structures –Fixedrate term loans –Rentalpurchase agreements ideal projectbased work

FAQ

Q What is typical final particle size achievable from stamp mill?
A With correct screen sizing water flow modern stamp mills consistently produce product suitable shaking tables or direct cyanidation typically passing mesh but retaining some coarse sand prevent overgrinding free gold particles

Q Can your stamp mills integrate existing gravity circuit?
A Yes units designed as plugandplay primary liberation devices discharge slurry can be fed directly onto concentrators or into sump pump systems minimal modification required existing plant layout

Q How does operational cost compare ball milling small scale?
A For operations under TPH processing hard quartzose ores total cost ownership often lower due significantly reduced mechanical complexity lower skill requirements maintenance simpler cheaper consumables despite potentially higher energy per ton grinding

Q What are lead times standard units?
A Standard –stamp units typically available within weeks exworks custom configurations require –weeks engineering fabrication depending scope modifications required

Q Do you provide wear parts ongoing support?
A Complete inventory wear parts including stamps dies liners cams held stock supported global distributor network ensure availability critical components minimize operational disruption