DASEN Machinery Launches New Tin Ore Processing Project in Rwanda
In the second quarter of 2025, DASEN Machinery initiated cooperation on a tin ore processing plant project in Rwanda, marking a new milestone in the company’s African market development.
Led by our engineer, a technical delegation traveled to Rwanda for on‑site geological and process assessment to formulate a tailored beneficiation solution.
Exploration Findings and Deposit Characteristics
The preliminary investigation revealed four tin‑bearing ore veins, accompanied by limited artisanal mining activities.
Although the area’s geological exploration remains at an early stage, the site offers several strategic advantages:
- Excellent transportation access via established road infrastructure.
- Abundant electricity and water supply, ensuring steady operational support.
Within a 70‑meter depth, the upper and mid‑level weathered zones are dominant. Approximately 60–70 % of the ore can be efficiently upgraded by washing and gravity separation, which significantly lowers processing costs.
The remaining 30–40 % consists of hard, quartz‑rich material, requiring crushing and grinding before further beneficiation.
Geological Insights
Based on field observations and mineralogical analysis, our engineering team reached the following conclusions:
- The deposit is hosted in S‑type granite, enriched in tin and associated metallic elements, formed by partial remelting of sedimentary rocks.
- During the late crystallization phase, hydrothermal fluids rich in volatile components (fluorine, chlorine) and metallic elements migrated through the rock mass.
- As temperature and pressure conditions changed, cassiterite (SnO₂) and related minerals precipitated, forming vein‑type hydrothermal tin deposits.
- Rwanda’s tin belt represents a Sn‑Ta‑W polymetallic mineralization system, where tin, tantalum, and tungsten commonly coexist within the same ore bodies.
These insights provide the scientific foundation for the process design and equipment configuration of the upcoming plant.
Process Design and Technological Highlights
Recognizing the varying degrees of ore weathering, DASEN Machinery’s engineering team developed a complete mineral processing line adapted to local conditions.
- Raw Material Pretreatment
Given the high degree of oxidation, the design includes pre‑screening and washing circuits, allowing approximately 70 % of feed material to be upgraded through direct washing.
This reduces the proportion of material requiring size reduction, thereby improving efficiency and lowering power consumption. - Beneficiation and Separation
The main concentration section employs a combination of gravity separation and magnetic separation, involving:
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- Rough concentration
- Intermediate grinding and re‑selection
- Selective enrichment of tantalum, niobium, and tin via staged magnetic separation
This integrated approach ensures maximum recovery of economically valuable metals while maintaining low operational costs.
A detailed process flow diagram is available upon request.
We sincerely welcome mining investors, partners, and clients worldwide to collaborate with us and explore how DASEN’s professional expertise can elevate your project’s success.
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