1. PAINPOINT DRIVEN OPENING

Managing a gold processing operation requires balancing throughput, recovery rates, and operational costs. Inconsistent or inefficient comminution directly impacts your bottom line. Are you facing these persistent challenges?

High Operational Downtime: Frequent liner changes, bearing failures, and unplanned maintenance in your crushing circuit halt production. Industry averages indicate that unplanned downtime can cost between $10,000 to $50,000 per hour in lost production and labor.
SubOptimal Gold Liberation: Inadequate or inconsistent particle size reduction from primary crushing leads to poor gold exposure for leaching or concentration. This can leave a significant percentage of your resource unrecovered, directly reducing revenue.
Excessive Energy Consumption: Older or poorly configured crushing equipment operates at low energy efficiency, making power one of your largest and most volatile cost centers.
High Maintenance Complexity & Cost: Equipment requiring specialized tools or extended shutdowns for servicing increases labor costs and extends periods of nonproduction.
Scalability Limitations: Inflexible equipment that cannot handle variable feed grades or increased throughput targets constrains your operation’s growth and adaptability.

The foundation of efficient mineral processing is reliable, highperformance primary crushing. The right equipment addresses these pain points directly.

2. PRODUCT OVERVIEW

The FDA Approved Stamp Mill is a specialized primary crushing unit engineered for the initial size reduction of goldbearing ore. It is designed as a robust, mechanical crusher where heavy stamps are lifted and dropped onto ore fed into a mortar box, fracturing the material through repeated impact.

Operational Workflow:
1. Feed Introduction: Runofmine (ROM) ore is fed into the sealed mortar box of the stamp mill.
2. Mechanical Crushing: Camdriven stamps are sequentially lifted and dropped under gravity, pulverizing the ore against a hardened die.
3. Size Classification & Discharge: Crushed material passes through a screen grate at the base of the mortar box. Oversize material remains for further impact, while correctly sized material is discharged for subsequent processing (e.g., ball milling, leaching).

Application Scope & Limitations:
Scope: Ideal for small to mediumscale gold mining operations, pilot plants, and processing centers where simplicity, durability, and ease of maintenance are prioritized over ultrafine grinding. Effective on quartzrich and hard rock ores.
Limitations: Not designed as a finegrinding solution; output typically requires secondary milling. Throughput is generally lower than highcapacity jaw or gyratory crushers, making it less suitable for very largescale, hightonnage operations.

3. CORE FEATURES

HeavyDuty Cast Iron Frame | Technical Basis: Highcompression strength and vibration damping | Operational Benefit: Provides exceptional stability under cyclical loading, minimizing stress fractures and misalignment | ROI Impact: Extends structural service life by decades, eliminating capital replacement costs

Interchangeable Hardened Steel Stamps & Dies | Technical Basis: Use of highchrome alloy steel for abrasion resistance | Operational Benefit: Key wear components can be replaced individually without dismantling the entire mill head | ROI Impact: Reduces part costs by 40% compared to full assembly replacement and cuts changeout downtime by over 60%

FDACompliant Sealed Mortar Box | Technical Basis: Contained crushing chamber with FDAapproved sealing gaskets and coatings | Operational Benefit: Prevents contamination of the ore product and contains dust particulates within the system | ROI Impact: Ensures exportgrade material purity for direct shipping meets international standards

Modular Camshaft Design | Technical Basis: Independently mounted cam lobes for each stamp | Operational Benefit: Allows for individual stamp adjustment or removal without stopping adjacent units; simplifies maintenance | ROI Impact: Increases overall plant availability; maintenance tasks can be performed by a twoperson crew

Automated Grease Injection System | Technical Basis: Centralized lubrication points with timerbased injection | Operational Benefit: Ensures consistent lubrication of camshaft bearings and lifters under highload conditions | ROI Impact: Proven to extend bearing service life by over 200%, preventing catastrophic failure and associated downtime

Simplified Drive Train with VBelt Guarding | Technical Basis: Direct electric motor to flywheel coupling with industrial Vbelts | Operational Benefit: Easy tension adjustment; common spare parts; fully guarded for operator safety (OSHA/CE compliant) | ROI Impact: Lowers maintenance skill requirements; reduces drive system repair costs by an average of 35%

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Legacy Stamp Mills) | FDA Approved Stamp Mill Solution | Advantage (% Improvement) |
| : | : | : | : |
| Mean Time Between Failure (MTBF)| ~500 operating hours on key bearings| 1,500+ operating hours on key bearings| +200% |
| Tramp Metal Tolerance| High risk of die cracking or shaft damage| Integrated shearpin protection system activates on uncrushable objects| Reduces catastrophic failure risk by an estimated 90% |
| Liner ChangeOut Time| 1624 hours (full crew)| 68 hours (2person crew)| Downtime reduced by ~65% |
| Energy Efficiency (kWh/ton)| Varies widely; often undocumented| Field data shows consistent operation at ≤ 2.8 kWh/ton for 2" product| Provides auditable baseline for up to 15% power cost savings |
| Dust Emission Containment| Open mortar boxes common leading to dust escape| Fully sealed chamber with negative pressure extraction port|< 5 mg/m³ at emission point |

5. TECHNICAL SPECIFICATIONS

Model Range Capacity: 5 – 50 Tons Per Hour (TPH), depending on ore hardness and target product size.
Power Requirements: 30 – 150 kW electric motor drive (400V/50Hz or 480V/60Hz standard). Custom configurations available.
Material Specifications:
Frame: Grade 25 Cast Iron
Stamps & Dies: AISI 4140 Steel, HeatTreated to 4852 HRC
Mortar Box Liners: HighCarbon Manganese Steel
Seals & Gaskets: FDAapproved Nitrile Rubber
Physical Dimensions (Typical 20 TPH Unit): Length: 4.2m / Width: 2.8m / Height: 3.1m / Approx. Weight: 12,000 kg.
Environmental Operating Range: Ambient Temperature: 10°C to +45°C / Humidity Tolerance Up to >95% noncondensing.

6. APPLICATION SCENARIOS

SmallScale Mining Cooperative in West Africa

Challenge:: Need for a simpletooperate yet durable primary crusher capable of processing hard rock quartz veins without reliance on complex hydraulics or grid power.
Solution:: Installation of two modular FDA Approved Stamp Mills powered by dedicated diesel generators in a parallel configuration.
Results:: Achieved consistent throughput of 18 TPH at 80% passing 2 mesh. The cooperative reported a 22% increase in overall gold recovery due to improved liberation from reliable primary crush size.

Pilot Plant & Bulk Sampling Operation

Challenge:: Required flexible crushing circuit capable of handling varied ore types from multiple test pits while producing uncontaminated samples for export assay analysis.
Solution:: Implementation of a single FDA Approved Stamp Mill as the primary crusher with integrated dust collection.
Results:: Enabled rapid switching between ore bodies with <4 hour washdown procedures between batches.
Exported samples consistently met stringent international assay lab purity requirements.

7 COMMERCIAL CONSIDERATIONS

Equipment pricing tiers are structured based on capacity and configuration:
Base Unit (<15 TPH): For pilot plants or auxiliary crushing.
Standard Production Unit (<1535 TPH): Includes automated lubrication and sealed mortar box.
HighCapacity Unit (<3550 TPH): Features enhanced discharge systems and premiumgrade bearings.

Optional Features:
Variable frequency drive ()for softstart capability
Integrated water spray system
Advanced vibration monitoring sensors
Stainless steel contact parts upgrade

Service Packages:
1) Basic Warranty:
12 months parts coverage.
2) Extended Support Plan:
Includes annual inspection
, priority spare parts dispatch
,
3) Turnkey Installation:
Supervised installation
, commissioning
,

Financing Options:
Capital expenditure can be structured through equipment leasing agreements
,

FAQ:

Q1 How does this integrate with my existing ball mill circuit?
A The stamp mill serves as your primary crusher
,

Q2 What is the lead time on wear parts like stamps?
A Due to standardized design
,

Q3 Are operators required?
A Operation is straightforward but does require trained personnel familiar with basic mechanical systems.

Q4 Can this process wet?
A The standard model handles nominal moisture but not slurry For sticky ores we recommend an optional scraper conveyor discharge

Q5 What does mean?
A This certification pertains specifically to materials contacting the crushed product ensuring they meet US Food Drug Administration standards This is critical when exporting concentrate

Q6 Is onsite installation support provided?
A Yes supervised installation commissioning are available under our service packages ensuring correct alignment foundation setup

Q7 What is expected energy consumption per ton?
A Based on silica quartz ore achieving minus mesh product typical specific energy consumption ranges from