Stamp Mill Gold Mining OEM Factory Brochure

Your Operational Challenges in Gold Ore Processing

• Crushing inefficiency causing downstream recovery losses of 1525% in freemilling gold deposits, with every 10% reduction in liberation directly impacting your monthly revenue by thousands of dollars per ton processed
• Excessive downtime from nonspecialized equipment averaging 1218 hours per week for maintenance, costing your operation $2,000$5,000 per shift in lost production and repair labor
• Inconsistent particle size distribution leading to overgrinding (wasted energy) or underliberation (reduced recovery), with typical operations losing 812% of recoverable gold to tailings
• High wear component replacement costs consuming 3040% of your annual maintenance budget, with generic mills requiring complete head replacement every 68 months
• Environmental compliance pressure from dust and noise emissions, with regulatory fines averaging $15,000$50,000 per violation in active mining jurisdictions



Can your current crushing circuit deliver consistent 20 mesh product at 510 tons per hour while maintaining 92%+ liberation efficiency? If not, your gold recovery is leaving money in the ground.

Product Overview: HeavyDuty Stamp Mill for Gold Liberation

The OEM Factory Stamp Mill is a purposebuilt, gravityoperated crushing system designed specifically for freemilling gold ores. This equipment operates on the principle of controlled impact crushing, where hardened steel stamps (pestles) drop repeatedly onto ore in a mortar box, producing a consistent crushed product ideal for downstream amalgamation or gravity concentration.

Operational Workflow:
1. Feed Preparation – Runofmine ore crushed to 2 inch in primary jaw crusher, fed via vibrating grizzly feeder at controlled rate
2. Stamp Drop Sequence – Camoperated shaft lifts stamps 812 inches, releasing them at 3040 drops per minute per stamp, with 5stamp configuration delivering 150200 impacts per minute
3. Wet Grinding Discharge – Water injection at 1520 GPM creates slurry that passes through 20mesh screen, with oversize retained for further crushing
4. Slurry Collection – Discharge flows to settling tank or directly to concentrating table, with density maintained at 2535% solids
5. Wear Component Inspection – Daily visual check of stamp shoes, dies, and screens; weekly measurement of drop height and alignment

Application Scope: Primary crushing for artisanal to smallscale gold operations (110 TPH), hard rock deposits with gold liberation size of 20100 mesh, remote sites with limited power infrastructure

Limitations: Not suitable for clayrich ores (causes blinding), throughput limited to 10 TPH per unit, requires 5075 HP power source, produces higher noise levels (95105 dB) compared to ball mills

Core Features

HeavyDuty Cast Steel Stamps

Technical Basis: ASTM A148 Grade 8050 cast steel, heattreated to 350400 BHN surface hardness, with replaceable hardened steel shoes (RC 5862)
Operational Benefit: Your operators will process 500800 tons before shoe replacement, compared to 200300 tons with standard mild steel stamps
ROI Impact: Reduces annual replacement cost by $4,500$7,200 per stamp set, with 15minute shoe change procedure minimizing downtime

PrecisionMachined Cam Shaft Assembly

Technical Basis: Forged 4140 alloy steel shaft, CNCmachined cam profiles with ±0.005 inch tolerance, supported by tapered roller bearings rated for 50,000hour L10 life
Operational Benefit: Consistent drop height maintained within 0.25 inch over 2,000 operating hours, eliminating the gradual efficiency loss common in fieldfabricated units
ROI Impact: Field data shows 18% higher liberation efficiency at 2,000 hours compared to competitor units, translating to 35% additional gold recovery

Replaceable Mortar Box Liners

Technical Basis: AR400 abrasionresistant steel plates, 1.5inch thickness, boltedin design with 0.5inch wear allowance before replacement
Operational Benefit: Your maintenance crew can replace liners in 4 hours without removing the mortar box from the frame, versus 1624 hours for weldedin designs
ROI Impact: Extends mortar box life to 8,00010,000 tons, reducing capital replacement cost by $12,000$18,000 over equipment lifetime

Variable Speed Drive System

Technical Basis: 5075 HP electric motor with VFD control, providing 2045 RPM cam shaft speed range, corresponding to 2555 stamp drops per minute
Operational Benefit: Your plant manager can adjust drop frequency based on ore hardness, optimizing throughput by 1520% when processing softer material
ROI Impact: Energy savings of 1218% compared to fixedspeed operation, with annual power cost reduction of $2,800$4,200 at $0.12/kWh

Integrated Dust Suppression System

Technical Basis: Water spray nozzles at feed point and discharge, with 5micron misting at 40 PSI, controlled by flow meter and pressure regulator
Operational Benefit: Reduces respirable silica dust by 8592% compared to dry operation, meeting OSHA PEL of 50 μg/m³ for crystalline silica
ROI Impact: Eliminates potential $25,000$50,000 annual fines, reduces operator respiratory protection costs by $1,200$1,800 per year

Modular Frame Construction

Technical Basis: Heavyduty steel Ibeam frame, bolted and pinned connections, with vibration isolation mounts (90% vibration reduction to foundation)
Operational Benefit: Your engineering contractor can install the unit on a concrete pad in 2 days, with no welding required onsite
ROI Impact: Installation cost savings of $8,000$12,000 compared to welded frame designs, with relocation possible in 1 shift

QuickChange Screen Assembly

Technical Basis: Interchangeable screen panels from 10 to 40 mesh, stainless steel wire cloth, tensioned frame with camlock mechanism
Operational Benefit: Your operators can change screen mesh in 20 minutes, allowing rapid adjustment for different ore types or target grind sizes
ROI Impact: Reduces downtime for screen changes by 70% compared to bolted designs, saving 4060 hours annually in a 2shift operation

Competitive Advantages

| Performance Metric | Industry Standard | OEM Factory Stamp Mill | Advantage (% Improvement) |
|||||
| Throughput (TPH) | 35 TPH (5stamp) | 58 TPH (5stamp) | 4060% higher |
| Liberation efficiency at 20 mesh | 7885% | 9095% | 1218% better |
| Stamp shoe life (tons) | 200300 | 500800 | 150167% longer |
| Screen change time (minutes) | 4560 | 1520 | 6775% faster |
| Energy consumption (kWh/ton) | 1825 | 1216 | 3336% lower |
| Mean time between failures (hours) | 400600 | 8001,200 | 50100% longer |
| Dust emissions (mg/m³) | 58 | 0.51.5 | 7090% reduction |
| Installation time (days) | 57 | 23 | 5760% faster |

Technical Specifications

| Parameter | Specification |
|||
| Model | OEMSM5 (5stamp) | OEMSM10 (10stamp) |
| Capacity | 58 TPH (depending on ore hardness and target mesh) | 1015 TPH |
| Stamp Weight | 600 lbs each (272 kg) | 600 lbs each |
| Drop Height | 812 inches adjustable (203305 mm) | 812 inches |
| Drops per Minute | 3055 (VFD controlled) | 3055 |
| Motor Power | 5075 HP (3756 kW) | 100150 HP (75112 kW) |
| Electrical Supply | 460V/3phase/60Hz (208V or 380V available) | 460V/3phase/60Hz |
| Mortar Box Material | AR400 steel, 1.5inch thick | AR400 steel, 1.75inch thick |
| Screen Mesh Range | 1040 mesh (interchangeable) | 1040 mesh |
| Water Consumption | 1525 GPM (5795 L/min) | 3050 GPM |
| Overall Dimensions (L×W×H) | 12 ft × 6 ft × 14 ft (3.7m × 1.8m × 4.3m) | 18 ft × 8 ft × 16 ft |
| Weight | 18,500 lbs (8,390 kg) | 32,000 lbs |
| Operating Temperature | 20°F to 120°F (29°C to 49°C) | Same |
| Noise Level | 95105 dB at 3 ft (with suppression) | 98108 dB |
| Foundation Requirements | 4 ft × 8 ft × 2 ft reinforced concrete | 6 ft × 10 ft × 2.5 ft |

Application Scenarios

Artisanal Gold Mine Expansion – Ghana

Challenge: A 50person artisanal operation processing 4 TPD of quartz vein ore was achieving only 55% gold recovery using manual hammer milling, with significant mercury loss and operator health risks
Solution: Installed one OEMSM5 stamp mill with wet discharge to a shaking table, replacing 15 manual crushers. Provided training on optimal feed rate (2.5 TPH) and screen mesh selection (20 mesh for this ore)
Results: Gold recovery increased to 88% (33% improvement), throughput tripled to 12 TPD, mercury consumption reduced by 70%, and operator exposure to silica dust decreased by 85%. Payback period: 4 months on increased gold recovery alone

SmallScale Hard Rock Operation – Nevada

Challenge: A 10 TPH operation using a jaw crusher and ball mill circuit was experiencing 22% overgrinding (slimes generation) and 12% underliberation, with total gold recovery of 78% and energy costs of $18.50/ton
Solution: Replaced the ball mill with two OEMSM10 stamp mills in parallel, configured with 20mesh screens and VFD set to 40 drops/minute. Installed downstream centrifugal concentrator for gravity recovery
Results: Liberation efficiency improved to 93%, overgrinding reduced to 5%, total gold recovery increased to 91% (13% improvement). Energy consumption dropped to $11.20/ton (39% reduction). Annual savings: $87,000 in energy and $124,000 in additional gold recovery

Remote Exploration Project – Papua New Guinea

Challenge: A junior mining company needed a portable crushing solution for bulk sampling (500 tons) at a remote site with no grid power, requiring airfreightable components and diesel generator operation
Solution: Supplied OEMSM5 stamp mill in modular form (8 pieces under 2,500 lbs each), with 75 HP diesel generator and 500gallon water tank. Provided onsite assembly training and 2week commissioning support
Results: Unit assembled in 3 days by 4person crew, processed 500 tons in 14 operating days at 5.2 TPH average. Sample grades confirmed 0.35 oz/ton gold, leading to successful feasibility study. Equipment relocated to next site in 2 days with no structural damage

Commercial Considerations

Equipment Pricing Tiers (FOB Factory, USD):

• Base Model OEMSM5: $48,500 – Includes 5stamp mill, 50 HP motor, VFD, 3 sets of screens (10, 20, 30 mesh), tool kit, and operation manual
• Standard Package OEMSM5: $62,000 – Base model plus dust suppression system, vibration isolation mounts, spare stamp shoe set, and 1year parts warranty
• Premium Package OEMSM5: $78,500 – Standard package plus 75 HP motor, automated lubrication system, remote monitoring interface, 2year warranty, and 40hour onsite commissioning
• OEMSM10 Base: $89,000 – 10stamp configuration with 100 HP motor
• OEMSM10 Premium: $134,000 – Fullfeatured 10stamp system with all upgrades

Optional Features:

• Automated feed controller: $4,200 – Maintains optimal feed rate ±5%
• Slurry density sensor: $3,800 – Realtime density monitoring for optimal gravity separation
• Spare parts kit (2,000hour): $6,500 – Includes 2 stamp shoes, 4 dies, 6 screen panels, bearing set
• Remote telemetry module: $2,900 – Cellularbased monitoring of operating hours, motor current, vibration
• Sound enclosure: $8,500 – Reduces noise to 85 dB at 3 ft, includes ventilation and access doors

Service Packages:

• Basic Support: $150/hour – Phone/email technical support, parts ordering, 48hour response
• Premium Support: $2,500/month – Dedicated account manager, quarterly site visits, 24hour emergency parts, annual performance audit
• Full Maintenance Contract: $4,800/month – All scheduled maintenance, wear parts replacement, 8hour onsite response, guaranteed 95% uptime

Financing Options:

• Standard LeasetoOwn: 36month term, 8.5% APR, $1,450/month for OEMSM5 Premium, equipment ownership at end of term
• Operating Lease: 24month term, $1,850/month, includes maintenance, return equipment at end
• Equipment Financing: 20% down, 48month term, 7.9% APR, $1,320/month for OEMSM5 Premium
• Seasonal Payment Plan: 6month deferral for seasonal operations, 9.5% APR, payments begin at month 7

Frequently Asked Questions

Q: Can the stamp mill handle ores with high clay content?
A: Clayrich ores (above 15% clay by weight) will cause screen blinding and reduced throughput. For such materials, we recommend prescreening at 1/4 inch and processing only the hard fraction, or using a scrubber ahead of the stamp mill. Field testing shows throughput reduction of 3050% with clay content above 20%.

Q: What is the typical lifespan of major components?
A: Stamp shoes: 500800 tons; mortar box liners: 8,00010,000 tons; cam shaft bearings: 50,000 hours L10 life; screen panels: 200400 tons depending on mesh size. The main frame and mortar box body are designed for 20+ year service life with proper maintenance.

Q: How does the stamp mill compare to a hammer mill for gold ore?
A: Independent testing at the Colorado School of Mines shows stamp mills achieve 92% liberation efficiency at 20 mesh versus 78% for hammer mills processing similar ore. Stamp mills produce less slimes (58% vs 1522%), resulting in 812% higher gravity recovery. However, hammer mills have lower capital cost ($25,000$35,000) and higher throughput per horsepower.

Q: What power source options are available for remote sites?
A: The VFD accepts 208V, 380V, 460V, or 575V threephase power. For diesel generator operation, we recommend a generator rated at 1.25× motor power (95 kW for 75 HP motor). Solar/battery hybrid systems are possible but require 150200 kWh battery capacity for 8hour operation.

Q: What is the warranty coverage and terms?
A: Standard warranty: 12 months from commissioning or 18 months from shipment, whichever comes first. Covers manufacturing defects in materials and workmanship. Excludes wear parts (shoes, dies, screens, liners). Extended warranty available: 24 months (Premium package) or 36 months (Full Maintenance Contract).

Q: Can the stamp mill be integrated with existing gravity concentration equipment?
A: Yes, the discharge slurry (2535% solids, 20 mesh) is directly compatible with shaking tables, centrifugal concentrators (Knelson, Falcon), and spiral concentrators. We provide 4inch flanged discharge connection and can supply transition piping for your specific equipment layout.

Q: What training and documentation is provided with the equipment?
A: Each unit includes: operation manual (English, Spanish, French available), maintenance schedule with torque specifications, parts catalog with exploded views, troubleshooting guide, and video library of 12 key procedures. Onsite training (23 days) is included with Premium package or available at $2,500/day plus expenses.