Subject: Optimizing HighVolume Recovery: Engineering Specifications for 500 TPH Gold Washing Plants

1. The Cost of Inefficient Throughput in Alluvial Operations

Your operation faces a critical bottleneck: processing 500 tons per hour of feed material while maintaining gold recovery rates above 90%. Common challenges include:

• Oversized Feed Handling: Uncrushed clay balls and boulders (exceeding 150mm) cause 1218% unscheduled downtime in standard scrubbers, costing an estimated $4,500/hour in lost production.
• Slurry Management Failures: Inadequate desliming leads to 812% gold loss in overflow fines, directly reducing your monthly concentrate yield.
• Water Consumption Penalties: Conventional systems often exceed 1,500 m³/day at this capacity, triggering regulatory fines or requiring expensive recycling infrastructure.
• Component Wear: High silica content (above 40%) in feed material can reduce trommel screen life by 60% if not specified for abrasion resistance.



Can your current setup handle a 500 TPH feed with 95%+ availability during the 8month operating season? The following specification addresses these constraints directly.

2. Product Overview: The 500 TPH Modular Gold Washing Plant

This equipment is a heavyduty, skidmounted alluvial gold processing system designed for continuous 500 TPH feed rates. It integrates scrubbing, screening, and primary concentration into a single, transportable unit.

Operational Workflow:
1. Feed Hopper & Grizzly: 50ton capacity hopper with hydraulic tipping grid (200mm aperture) removes +200mm oversize.
2. Rotary Scrubber: 3.2m diameter x 8.0m long drum with 18mm AR400 steel lifters. Breaks down claybound material at 12 RPM.
3. Trommel Screen: 2.4m diameter x 6.0m doubledeck screen (12mm and 6mm apertures). Classifies 6mm slurry to concentrators.
4. Primary Jigging Circuit: Four parallel duplex jigs (30 tph each) recover free gold from the 6mm fraction.
5. Tailings Discharge: Hydraulic cyclone desliming unit (optional) for fines management.

Application Scope: Best suited for placer deposits, weathered hard rock (oxide), and river terrace gravels with clay content up to 35%. Limitations: Not recommended for primary hard rock (requires crushing circuit) or feeds with high sulfide content (>5%).

3. Core Features

HighTorque Scrubber Drive | Technical Basis: Hydrostatic variablespeed drive with planetary gearbox | Operational Benefit: Adjustable drum speed (814 RPM) to match clay plasticity without stalling | ROI Impact: Reduces power consumption by 18% vs. fixedspeed drives; eliminates shear pin replacement costs ($2,200/event)

Modular Skid Design | Technical Basis: ISO container footprint (12m x 2.5m x 3.2m per module) | Operational Benefit: Site assembly in 5 days with crane; no concrete foundations required | ROI Impact: Saves $180,000 in civil works per relocation; reduces mobilization time by 60%

Polyurethane Screen Media | Technical Basis: 65mm thick modular polyurethane panels with 30% open area | Operational Benefit: 3x longer wear life vs. woven wire; reduces blinding in sticky clay | ROI Impact: Screen replacement cost drops from $14,000/quarter to $4,500/quarter

DualStage Jigging Circuit | Technical Basis: Four 2cell duplex jigs with automatic hutch water control | Operational Benefit: Achieves 9295% recovery for +75 micron gold | ROI Impact: Increases monthly gold capture by 79% vs. singlestage jigging

Integrated Water Management | Technical Basis: Closedloop sump with 200m³/hr centrifugal pump and hydrocyclone | Operational Benefit: Recycles 85% of process water; reduces fresh water demand to 300 m³/day | ROI Impact: Eliminates $0.15/m³ water sourcing costs; meets discharge compliance

4. Competitive Advantages

| Performance Metric | Industry Standard (500 TPH) | 500 TPH Washing Plant Solution | Advantage (% Improvement) |
| : | : | : | : |
| Uptime (clay feed) | 72% (8 hours downtime/week) | 91% (2 hours downtime/week) | +26% |
| Gold Recovery (75µ) | 82% | 93% | +13% |
| Power Consumption | 0.8 kWh/ton | 0.55 kWh/ton | 31% |
| Water Consumption | 1,200 m³/day | 300 m³/day | 75% |
| Screen Life (silica feed) | 4 months | 14 months | +250% |
| Mobilization Time | 14 days | 5 days | 64% |

5. Technical Specifications



| Parameter | Specification |
| : | : |
| Capacity | 500 TPH (nominal), 550 TPH (peak, dry feed) |
| Feed Top Size | 200mm (grizzly aperture) |
| Scrubber | 3.2m dia. x 8.0m, 18mm AR400, 12 RPM (variable 814) |
| Trommel | 2.4m dia. x 6.0m, double deck (12mm / 6mm) |
| Jigging Capacity | 4 x 30 TPH duplex jigs (120 TPH total concentrate) |
| Power Requirement | 275 kW (380V/50Hz or 480V/60Hz, 3phase) |
| Water Requirement | 300 m³/day (fresh), 1,200 m³/day (circulating) |
| Operating Weight | 185 metric tons (dry) |
| Dimensions (LxWxH) | 28m x 8m x 6.5m (assembled) |
| Operating Temp Range | 10°C to 45°C (with coldweather package) |

6. Application Scenarios

LargeScale Alluvial Mine, West Africa | Challenge: 35% clay content in feed caused 40% downtime in existing scrubber; gold recovery was 78% due to fines loss | Solution: Installed 500 TPH plant with hightorque scrubber and dualstage jigging | Results: Uptime increased to 89%; gold recovery improved to 92%; monthly production rose from 18 kg to 24 kg

River Terrace Gravel Operation, South America | Challenge: High silica content (55%) destroyed trommel screens every 3 months; replacement cost $18,000 per event | Solution: Specified polyurethane screen media and AR400 scrubber liners | Results: Screen life extended to 14 months; annual maintenance cost reduced by $52,000

Contract Mining Project, Southeast Asia | Challenge: Site required relocation every 6 months; conventional plant took 21 days to move | Solution: Deployed modular skidmounted 500 TPH plant | Results: Relocation completed in 5 days; mobilization cost reduced by 65%; project delivered 3 weeks ahead of schedule

7. Commercial Considerations

Equipment Pricing Tiers:

• Base Configuration (Standard Steel): $1.85M $2.1M (includes scrubber, trommel, jigs, control panel)
• Premium Configuration (AR400/AR500 liners): $2.3M $2.6M (includes wear package, hydraulic drive, autolube)
• Full Turnkey Package: $3.1M $3.5M (includes feed hopper, conveyors, water system, 12month spares kit)

Optional Features:

• Coldweather package (heated sumps, insulated piping): +$180,000
• Remote monitoring system (SCADA with 4G telemetry): +$95,000
• Gold room with shaker table and retort: +$220,000

Service Packages:

• Standard Warranty: 12 months / 4,000 operating hours
• Extended Service Contract: $45,000/year (includes quarterly inspections, 48hour emergency response)
• Operator Training: $12,500 (5day onsite program for 4 operators)

Financing Options:

• 30% down payment, balance over 36 months at 6.5% APR (subject to credit approval)
• Leasetoown option: $48,000/month for 60 months

8. FAQ

Q: Can this plant handle feed with 40% clay content?
A: Yes. The hightorque scrubber (12 RPM with 18mm lifters) is designed for clay plasticity up to 45%. Field data from West Africa shows 91% uptime with 35% clay feed.

Q: What is the minimum order quantity for a 500 TPH plant?
A: Minimum order is one complete plant. However, we require a 30% deposit to initiate fabrication, with lead time of 1416 weeks from order confirmation.

Q: How does this compare to a 300 TPH plant in terms of cost per ton?
A: The 500 TPH plant reduces cost per ton by 22% ($0.45/ton vs. $0.58/ton for 300 TPH) due to shared infrastructure and lower power consumption per ton.

Q: What is the expected payback period?
A: Based on $1,800/oz gold and 92% recovery, typical payback is 810 months for a 500 TPH operation processing 0.5 g/t feed.

Q: Can the plant be modified for diamond recovery?
A: Yes. The jigging circuit can be reconfigured with grease belts or Xray sorters. Contact our engineering team for a feasibility assessment.

Q: What is the warranty on the trommel screen?
A: 12 months against manufacturing defects. Polyurethane panels are warranted for 24 months against premature wear (excluding abrasive feed above 60% silica).

Q: How is the plant shipped?
A: In 6 ISO container modules (20ft and 40ft). Total shipping volume is 180 m³. CIF port delivery is included in the pricing.