Hard rock gold ore beneficiation effect largely depends on scientific crushing and screening process design. Reasonable particle size control directly improves the recovery efficiency of subsequent ball mill, wet pan mill, shaking table and other gravity separation equipment. Many small-scale gold mining investors face low production efficiency, frequent equipment blockage and poor mineral recovery due to unreasonable process layout and mismatched equipment.

1. Core Principle of Rock Gold Ore Crushing & Screening Flow

The purpose of crushing and screening is to dissociate gold minerals from gangue rock. Raw ore is crushed step by step to reach qualified feeding particle size required for grinding equipment. Closed-circuit crushing screening flow has become the mainstream scheme for modern gold mines.

The circulating system sends unqualified coarse ore back to the crusher for secondary crushing, ensuring stable particle size of final ore material. It reduces invalid load of grinding equipment and cuts the overall power consumption of the whole beneficiation plant.

2. Standard Complete Process Flow

• Step1: Raw ore is transported to vibrating feeder for uniform feeding and impurity removal;
• Step2: Bulk ore enters jaw crusher for primary coarse crushing;
• Step3: Crushed material is transported to circular vibrating screen via belt conveyor;
• Step4: Oversized coarse ore returns to jaw crusher for re-crushing;
• Step5: Qualified fine ore flows into silo for subsequent grinding and separation process.

3. Matching Equipment Composition of Production Line

3.1 Vibrating Feeder

Realize continuous and uniform feeding, avoid material accumulation and blockage, and protect the feeding port of the crusher from large-size bulk impact.

3.2 Jaw Crusher

Core primary crushing equipment, suitable for processing high-hardness rock gold ore. Simple structure, stable operation and low maintenance cost, very suitable for remote African mining sites.

3.3 Circular Vibrating Screen

Classify ore materials according to particle size, realize closed-circuit circulation crushing. Multi-layer screen mesh can realize multi-grade material separation according to customer demands.

3.4 Belt Conveyor

Connect all equipment to realize automatic continuous production, reduce manual transportation cost and improve site operation safety.

4. Equipment Selection Reference Based on Production Capacity

• 5–20TPH Small Gold Mine: Mini jaw crusher + single-layer vibrating screen
• 20–50TPH Medium Beneficiation Plant: Medium jaw crusher + double-layer vibrating screen
• Above 50TPH Large Production Line: Primary jaw crusher + fine jaw crusher + multi-layer vibrating screen

5. Common On-site Faults & Practical Solutions

5.1 Frequent blockage of jaw crusher

Cause: Unstable feeding amount and mixed wet sticky ore. Solution: Match vibrating feeder reasonably and control raw ore stacking height.

5.2 Low screening efficiency of vibrating screen

Cause: Screen mesh aging, unreasonable screen inclination. Solution: Regularly replace screen mesh and adjust vibration parameters.

5.3 Oversize ore enters grinding system

Cause: Closed circulation flow is not strictly implemented. Solution: Standardize material return channel and check conveyor operation daily.

6. Advantages of Wanshihengtong Crushing & Screening Solution

Wanshihengtong provides global gold mining customers with one-stop service including process layout design, complete equipment supply and on-site technical guidance.

All crushing and screening equipment can adapt to high temperature, dust and other harsh mining environments in Africa, Southeast Asia. Our technical team can customize flow schemes according to ore characteristics, plant area and target output of customers.