Tungsten in Mongolia: Distribution, Characteristics, and Beneficiation Processes

Mongolia possesses significant tungsten resources, primarily concentrated in its western region, where skarn-type and quartz vein-type deposits dominate. These ores often contain associated metals such as copper, bismuth, and tin, presenting both opportunities and challenges for efficient extraction. This article explores the geographical distribution and geological characteristics of Mongolian tungsten deposits, along with their development potential, and the mineral composition, beneficiation processes, and optimization strategies for these ores. Understanding these aspects is crucial for maximizing resource utilization and economic returns.

 

Distribution and Characteristics of Tungsten Resources in Mongolia

Main Distribution Areas

Tungsten resources in Mongolia are primarily concentrated in the western region, mainly as skarn-type e quartz vein-type deposits, with some associated with estanho, cobre, ou bismuto. Key areas include:

 

1. Khovd Province

Key deposits: Tsakhir (Mongolia’s largest tungsten mine), Bayan-Uul

Caraterísticas:

• Predominantly scheelite (CaWO₄)with minor volframite (Fe/MnWO₄)
• Average WO₃ grade: 0.3%~0.8%, with some high-grade zones reaching 1.2%
• Ore bodies are often linked to granite intrusions, forming stratified/vein-type structures
• Frequently associated with copper, bismuth, and molibdénio, making them suitable for polymetallic extraction

 

2. Bayan-Ölgii Province

Key deposits: Ulaan Khud, Kharmagtai (tungsten-copper deposit)

Caraterísticas:

• Mainly skarn-type, with some hydrothermal vein-type deposits
• Estimated WO₃ reserves: 20,000–50,000 tons, with some deposits still under exploration
• Overlaps with copper-gold mineralization zones, potentially forming future polymetallic mining hubs

 

3. Govi-Altai Province

Small-scale deposits: Altai Uul, Tugalgatai

Caraterísticas:

• Often associated with cassiterite (tin ore)
• Lower WO₃ grades (0.2%~0.5%), but exploration remains limited, leaving untapped potential

 

 

Geological Features

Genetic types

• Skarn-type (dominant): Linked to Late Paleozoic–Mesozoic granite intrusions; mainly scheelite
• Hydrothermal quartz vein-type: Wolframite + minor cassiterite (e.g., certain veins in Tsakhir)
• Greisen-type (minor): Found in Bayan-Ölgii, associated with lithium-beryllium mineralization

 

Ore characteristics

• Scheelite accounts for >70%, wolframite is less common (<30%)
• Often contains copper (0.1%0.5%), bismuth (0.05%0.2%), and tin (some deposits)
• Good processability: Flotation recovery rates typically reach 75%~85%

 

Reserves and grades

Deposit/Province	WO₃ Reserves (10K tons)	Avg. Grade (WO₃ %)	Associated Metals
Tsakhir (Khovd)	8+	0.5–0.9	Cu, Bi
Ulaan Khud (Bayan-Ölgii)	2–3	0.3–0.6	Cu, Au
Altai Uul (Govi-Altai)	~1.5	0.2–0.5	Sn

Nota: Tungsten exploration in Mongolia remains underdeveloped, with many prospects still not thoroughly assessed.

 

Development Potential Analysis

Mongolia has rich tungsten resources, but it is underdeveloped. Its importance in the global supply chain is gradually increasing. Its future development potential is affected by many factors, including resource endowment, policy environment, and international market demand.

 

1. Resource Advantages

High-Grade Ore Deposits:

• Some Mongolian tungsten mines (such as Jargalant and Bor Uul) have an average WO₃ grade of 0.5%-1.2%, exceeding the global average (some Chinese mines have grades of only 0.2%-0.5%).
• Rich associated metals (tin, beryllium, molybdenum, and rare earth elements) enhance the overall development value.

 

Low Exploration Level, High Prospecting Potential:

• Currently, exploration is concentrated in the western and northern regions (Bayan-Ulgii and Khuvsgul Provinces), while the potential in the southern Gobi region remains to be assessed.
• Some mining areas contain shallow, high-grade ore bodies, suitable for low-cost open-pit mining.

 

2. Challenges

• Infrastructure constraints(limited power and road networks)
• Need for improved beneficiation techniques(high extraction costs for some low-grade ores)

 

3. Trend

Future development may focus on integrated tungsten-copper-bismuth mines. 

Mongolia’s tungsten deposits are primarily scheelite-dominant skarn-type, with the Khovd–Bayan-Ölgii belt being the most resource-rich. They offer integrated mining (Cu-Bi-Sn) potential, but require greater investment in exploration and processing technology. 

 

Composition And Beneficiation of Tungsten Ores in Western Mongolia

Western Mongolia hosts the country’s most significant tungsten resources, characterized by scheelite-dominant skarn deposits with unique mineralogical properties. As global tungsten demand grows, optimizing beneficiation processes for these ores has become critical. The following will systematically analyze the composition of the main tungsten mines in the western region and their beneficiation process flows.

 

1. Mineralogical Analysis

The ore deposit is primarily composed of black tungsténio ore (Fe, Mn) WO₄, with white tungsten ore (CaWO₄) as a secondary component. Associated metallic minerals include magnetite, chalcopyrite, pyrite, molybdenite, bismuthinite, and sphalerite, among others. Non-metallic minerals primarily consist of quartz, plagioclase, mica, and fluorite. Black tungsten ore typically occurs in nest-like, massive, or disseminated distributions, with coarse crystals (0.5–5 cm in size). White tungsten ore forms massive or granular aggregates (0.1–1.2 mm in size). The mineral assemblage exhibits horizontal and vertical zoning:

• Horizontal zoning: The southern part is dominated by black tungsten ore + pyrrhotite + chalcopyrite, while the northern part is dominated by white tungsten ore + sphalerite.
• Vertical zoning: The shallow part consists of white tungsten ore + black tungsten ore + chalcopyrite, while the deep part consists of white tungsten ore + molybdenite + stibnite + sphalerite.

 

2. Mineral Processing Flow Design

Based on the characteristics of the ore, a process flow of “stage grinding-classification and sorting-combined recovery” is adopted, with a focus on recovering black tungsten ore, white tungsten ore, and associated valuable metals.

(1) Crushing and Pre-selection

Trituração grosseira: Britadeiras de maxilas are used to crush the ore to ≤150 mm. 

Trituração média e fina: Trituradores de cone + high-pressure roller mills are used to crush the ore to ≤20 mm.  

Pre-selection: Photoelectric sorting or heavy medium sorting is used to pre-remove some waste rock (quartz, feldspar, etc.), thereby improving the grade of the feed material.

 

 

(2) Grinding and Classification  

Stage grinding: A two-stage closed-circuit grinding process using rod mills and moinhos de bolas is employed to control the liberation degree of black tungsten ore (with particles ≤0.3 mm accounting for over 80%), avoiding over-grinding.

Classificação: Use um classificador em espiral + hidrociclone to ensure the particle size is suitable for subsequent sorting.

 

(3) Main Recovery of Black Tungsten Ore (Gravity Separation + Magnetic Separation)

Separação por gravidade: Use um jig + shaking table to recover coarse-grained black tungsten ore (>0.5 mm), and use a spiral chute + centrifugal concentrator to enrich the fine-grained fraction (-0.5 mm).

Separação magnética: Weak magnetic separation (to remove pyrite) and separação magnética forte (to separate black tungsten ore from white tungsten ore) are applied to the gravity separation concentrate.

 

(4) White tungsten ore flotation

Flotation pretreatment: The gravity separation tailings are finely ground (-0.074 mm accounts for 90%), with Na₂CO₃ used to adjust the pH to 9–10e water glass added to suppress silicate minerals.

Collectors: Fatty acid-based (e.g., oleic acid) or chelating collectors are used for white tungsten ore flotation, with phosphates added in the concentrate stage to enhance selectivity.

 

(5) Comprehensive Recovery of Associated Metals  

Sulfide Ore Flotation: Copper, molybdenum, and bismuth are mixed and floated from the flotation tailings (using xanthate-type collectors + frothers), followed by copper suppression para separate molybdenum/bismuth.  

Zinc Recovery: Sphalerite in the tailings is activated and floated (using CuSO₄ activation + xanthate collectors).

 

(6) Tailings treatment

Dry stacking or backfilling: Tailings are dewatered and dry-stacked to minimize environmental pollution.

Fluorite recovery: If fluorite content is high, a processo de flotação can be added (sodium silicate inhibition of gangue minerals, oleic acid collector).

 

3. Key process optimization

Black tungsten ore protection: Avoid over-crushing and use multi-stage gravity separation to improve recovery rates.

Mineral zoning differences: Adjust grinding fineness and reagent regimens for northern and southern mineral belts and shallow and deep ore deposits.

Environmental protection measures: Utilização wastewater recycling, and neutralize and treat flotation wastewater from sulfide ores.

 

Conclusão

Mongolia’s tungsten resources, particularly in the western regions, hold considerable potential due to their substantial reserves and polymetallic character. However, maximizing their economic value requires optimizing beneficiation processes, improving infrastructure, and adopting advanced technologies such as AI-driven mineral processing. Future developments should focus on integrated extraction of tungsten-copper-bismuth ores, cost-effective flotation enhancements, and sustainable mining practices to strengthen Mongolia’s position in the global tungsten market. With strategic investments and technological innovation, these deposits could become a key contributor to the nation’s mining sector.