Gold Washing Services in Vietnam—Professional Gold Extraction Technology—Highly Efficient Recovery Solutions
Gold Processing Services in Vietnam—Professional Gold Extraction Technology—Highly Efficient Recovery Solutions
Gold resources in Vietnam are widely distributed, ranging from Son La and Hòa Bình in the north, to Quảng Nam and Quảng Ngãi in the central region, and down to Bình Thuận and Lâm Đồng in the south. The country possesses both primary rock gold deposits and a large number of placer gold sites and small alluvial gold deposits along rivers.In recent years, investment in Vietnam\'s mining sector has been robust, but many mine owners face the same challenge: while their mines “can produce gold,” recovery rates remain low, fine-grain gold is severely lost in tailings, and even with equipment in place, operations do not run smoothly.
“Gold washing” is the core gold extraction process in placer gold and small-scale bedrock gold mining—including ore washing, screening, and gravity separation. When the process is properly configured, both coarse and fine-grained gold can be recovered; if configured poorly, the gold is washed away with the muddy water into the tailings.This article, drawing on the characteristics of Vietnamese gold mines, clearly explains the process logic, equipment configuration, and high-efficiency recovery solutions for gold washing services.
I. Characteristics of Vietnamese Gold Mines: Understand the Mine First, Then Discuss Gold Processing
Vietnam\'s gold mines are diverse, and gold processing services primarily target the following scenarios:
① Alluvial gold deposits (riverine, riverbed, and residual-slope types)
Vietnam has numerous rivers, and placer gold deposits are scattered. The gold occurs as free, individual particles ranging in size from micrometers to centimeters, eliminating the need for grinding. The core process consists of washing—screening—gravity separation. Mobile solutions are suitable for dispersed deposits, while stationary solutions are suitable for concentrated ore sources.
② Small-scale bedrock gold deposits (primarily quartz vein-type)
The mountainous regions of northern and central Vietnam contain a large number of small-scale quartz vein gold deposits. Gold is primarily found as fissure gold and intergranular gold, with both coarse and fine-grained gold coexisting. Gold washing and gravity separation can serve as a preliminary recovery step for coarse-grained gold within a grinding circuit or as a simplified gold extraction solution for small-scale deposits.
③ Oxidized ores and residual-colluvial deposits with high clay content
Vietnam\'s tropical monsoon climate results in deep weathering and high clay content in the ore, making the ore washing stage particularly critical—if the clay is not thoroughly washed out, subsequent gravity separation equipment will become clogged, and fine-grained gold will be lost along with the clay.
④ Artisanal/semi-mechanized gold mining operations
Some small-scale mining sites still use rudimentary methods for gold extraction and require processing solutions that meet environmental requirements (mercury-free). A combination of a gold crusher and gravity separation can replace traditional mercury plates.
In a nutshell: The core of gold washing services in Vietnam lies in “thorough washing, precise screening, and effective recovery through gravity separation”—tailoring solutions to address the characteristics of high clay content, uneven particle size, and scattered mining sites.
II. Gold Processing Workflow: A Three-Step Approach—Washing, Screening, and Gravity Separation
The core logic behind the gold washing process for placer gold deposits and small-scale bedrock gold deposits is:
① Ore Washing
A trommel washer or trommel screen washes the ore with water to disperse clay and remove mud, preventing clogging of downstream equipment. Since Vietnamese ore has a high clay content, the washing intensity must be sufficient; otherwise, mud clumps will encase the gold particles, making them unrecoverable via gravity separation.
② Screening
Trommel screens or vibrating screens classify the ore by particle size; the oversize waste rock is discharged, while the undersize slurry enters the gravity separation system. Screen mesh size is determined based on gold particle size and ore characteristics.
③ Gravity Separation
- Chutes (Roughing): Spiral chutes, agitated chutes, and gold-adhesive chutes are used to capture coarse gold particles; these feature simple structures and high throughput;
- Centrifugal Separators (Enrichment): These enhance gravity separation based on centrifugal principles to recover fine-grained gold and are critical equipment for fine-grained gold recovery;
- Shaking tables (refining): 6-S shaking tables or multi-deck shaking tables, which offer high separation precision and produce gravity concentration concentrate;
- Concentrate Smelting: The gravity separation concentrate is sent to the shaking table for fine selection, after which it is smelted to produce blended gold.
Process Flow: Drum screen/ore washer for washing and classification → Chute roughing → Centrifugal concentrator for enrichment → Shaking table for fine selection → Smelting of blended gold. Over-size waste rock is discharged, while under-size slurry enters the gravity separation system; the recirculating water system recovers most of the process water.
Optimization for the Vietnam Mine Site:
- Intensify ore washing when clay content is high (combination of cylindrical washer and spiral washer);
- Coarse-grain gold recovery depends on the configuration of the sluice boxes and centrifuges;
- Fine-grain gold requires scavenging using shaking tables or centrifuges to prevent tailings loss;
- For dispersed mining sites, use a mobile drum screen + chute + centrifuge combination—set up and go.
III. High-Efficiency Recovery Solutions: Key Considerations for Equipment Configuration and Selection
Solution 1: Mobile Gold Washing Solution (for Dispersed Deposits and Short-Term Mining)
Applicable to: riverine alluvial deposits, residual slope deposits, and small-scale artisanal/semi-mechanized gold mining operations.
Configuration: Mobile trommel screen (combining ore washing and screening) + sluice box + centrifugal concentrator + small shaking table + sand pump + recirculating water system.
Advantages: Set up and go; flexible relocation; manageable investment; well-suited to Vietnam\'s characteristics of scattered, small-scale mining sites.
Key Selection Criteria: Match the drum screen\'s processing capacity to the site\'s production capacity; select the centrifuge based on fine-grain gold recovery requirements; consider transportation during Vietnam\'s rainy season and site conditions when choosing mobile equipment.
Option 2: Stationary Gold Processing Solution (Centralized Ore Sources, Large-Scale Operations)
Applicable to: Placer gold mines with concentrated ore sources and small-scale lode gold processing lines.
Configuration: Cylindrical ore washer/screw ore washer + trommel screen/vibrating screen + spiral chute + centrifugal concentrator + shaking table + thickener + recirculating water system.
Advantages: High processing capacity, high recovery rate, and stable operation; suitable for large-scale continuous production.
Key Selection Points: The ore washing section should be configured with enhanced capacity to handle high silt content; the gravity separation section should feature a three-stage configuration (roughing, concentrating, and fine sorting) to recover both coarse and fine particles; the water recirculation system should be configured in accordance with environmental protection requirements.
Solution 3: Small-Scale Rock Gold Ore Washing and Gravitation Separation Solution
Applicable to: Small-scale quartz vein gold deposits in Vietnam and scenarios where a gold mill replaces a crushing and grinding mill.
Configuration: Jaw crusher (primary crushing) + gold mill (grinding, replacing the ball mill) + chute/centrifuge recovery + shaking table concentration + smelting.
Advantages: The gold mill can replace both the jaw crusher and the ball mill, directly grinding the ore to an adjustable discharge size; the use of gravity separation replaces mercury, meeting environmental requirements for mercury-free operations.
Selection Criteria: The type of gold mill (two-wheel or three-wheel) is determined based on processing capacity and discharge particle size; gravity separation equipment is configured for the recovery of coarse-grain gold.
IV. Three Key Points for Gold Processing Services in Vietnam
① High Mud Content Requires Aggressive Ore Washing
Vietnam\'s tropical climate results in deep weathering, leading to high clay content in the ore. Inadequate ore washing allows clay clumps to encapsulate gold particles, making them unrecoverable by gravity separation equipment; the viscous slurry can also clog chutes and centrifuges.A combination of a cylindrical ore washer and a spiral ore washer, along with sufficient water pressure and retention time, is essential for efficient recovery.
② Fine-Grain Gold Must Not Be Lost; Centrifuges and Shaking Tables Must Be Properly Matched
Placer gold deposits contain a high proportion of fine-grained gold; relying solely on sluice box roughing allows fine-grained gold to be carried away with the tailings. The combination of centrifugal enrichment and shaking table fine selection is key to recovering fine-grained gold. When selecting equipment, determine the centrifuge model and shaking table configuration based on the particle size distribution of the gold.
③ For Dispersed Mining Sites, Mobile Solutions Offer Better Value
Many mining sites in Vietnam are scattered and small in scale, making the payback period for fixed processing plants lengthy. A mobile combination of a trommel screen, sluice boxes, and a centrifuge offers flexible relocation and manageable investment, making it suitable for dispersed mining sites and short-term operations.
V. GoldProcessingPlant\'s Gold Processing Services in Vietnam
GoldProcessingPlant is a full-service provider for gold mining, integrating process design, equipment manufacturing, installation, and commissioning. For the gold mining markets in Vietnam and Southeast Asia, we offer:
① Gold Processing Design and Equipment Selection
Based on ore sample testing and particle size analysis, we determine the ore processing intensity, screening particle size, and gravity separation equipment configuration, and provide an equipment list and quotation.
② Mobile/Stationary Gold Processing Equipment Packages
Trommel washers, trommel screens, chutes, centrifugal separators, shaking tables, sand pumps, and recirculating water systems—available as individual units or complete systems, tailored to site conditions.
③ Small-scale rock gold ore processing solutions
A combination of jaw crusher + gold mill + gravity separation + smelting, replacing mercury plates to meet mercury-free environmental requirements.
④ Installation, Commissioning, and Technical Training
Engineers will travel to the site to supervise equipment installation and commissioning, and train operators to adjust ore washing water flow, screening particle size, and gravity separation parameters until qualified concentrate is produced.
⑤ Flexible Services
Customers may choose to purchase only equipment, only drawings, or hire engineers for commissioning only; alternatively, a full-process solution is available. Initial design fees can be offset against subsequent equipment contracts.
⑥ Experience with Southeast Asian Projects
Our projects span major gold-producing countries worldwide, including Southeast Asia. We are well-versed in international logistics, customs clearance, and local construction conditions, and provide technical coordination in English or bilingual formats; engineers can be dispatched to the site.
Our Principle: We first assess the ore\'s clay content, gold particle size distribution, and mine scale; then determine the gold processing plan and equipment configuration; and finally dispatch engineers to the site to fine-tune operations until gold is recovered. We do not promise absolute targets divorced from the actual ore conditions; we only commit to processes that achieve the highest recoverable rates based on scientifically validated methods.
VI. Gold Processing Service Collaboration Process
- Sample Submission and Testing: Provide ore samples for gold particle size analysis, clay content measurement, and recoverability testing;
- Solution Design: Determine whether to use a mobile or stationary solution, equipment configuration, processing capacity, and provide a quote;
- Contract Confirmation: Clarify the equipment list, scope of delivery, project timeline, and responsibilities of both parties;
- Equipment Manufacturing and Shipping: Manufacture according to drawings and coordinate logistics for shipment to the site in Vietnam;
- Installation and Commissioning: Engineers provide on-site guidance for installation and commissioning, and train operators;
- Commissioning and After-Sales Service: Conduct acceptance inspections and handover, and provide long-term spare parts supply and technical support.
Timeline Reference: Equipment for gold washing solutions is relatively standardized, resulting in a short manufacturing lead time; for mobile solutions, the time from contract signing to production start-up is typically shorter than for large-scale processing plants, though this depends on specific equipment configurations and logistics conditions.
