1. Understand the characteristics of ores
(1) Gold content and particle size

(2) Ore composition and properties

2. Equipment types and principles
(1) Re-select the device

(2) Cleaning and screening equipment - drum screening and washing machine: The rotation of the drum is used to clean and screen the ore, with large processing capacity and high screening efficiency.

3. Production efficiency and cost
(1) Production efficiency 

(2) Operating costs
Consider the operating costs such as energy consumption, water consumption, and maintenance costs of the equipment. Choosing energy-saving, efficient, and environmentally friendly equipment can help reduce long-term operating costs. 

4. Equipment quality and after-sales service
(1) Equipment quality
Choose well-known brands and reputable suppliers to ensure reliable equipment quality and long service life.

(2) After-sales service - Understand the supplier's after-sales service system, including equipment installation, commissioning, training, maintenance, etc. Good after-sales service can ensure that the equipment receives timely and professional support during use. 

5. On-site inspection and trial use

6. Comprehensive evaluation and selection
Based on the above factors, conduct a comprehensive evaluation of multiple devices, including performance, cost, quality, after-sales service, etc. Finally, choose alluvial gold washing equipment that meets your own production needs, is cost-effective, and has reliable quality. 

In short, choosing appropriate placer gold washing equipment requires comprehensive consideration of multiple factors, including ore characteristics, equipment type and principle, production efficiency and cost, equipment quality and after-sales service, etc. Through comprehensive and detailed evaluation and comparison, you can find the equipment that best suits you, thereby improving production efficiency, gold recovery rate and purity.