what is the thumbrule for good grades, average or low grades for...

what is the thumbrule for good grades, average or low grades for CuIs there a link for education?

1. **High-grade copper ore**: More than 1.5% Cu
- These deposits are considered very valuable and economically viable. High-grade ore is often found in established copper mines.

2. **Moderate-grade copper ore**: Between 0.5% and 1.5% Cu
- This range is still economically attractive, especially with efficient extraction and processing techniques. It forms the bulk of many operational mines.

3. **Low-grade copper ore**: Less than 0.5% Cu
- These deposits require more efficient and cost-effective processing to be viable. Advances in mining technology and rising copper prices can make lower-grade ores economically feasible to mine.

These grades are a simplified guideline and can vary based on factors like location, depth, ore body characteristics, market conditions, and the costs associated with mining and processing the ore.

Source: ChatGPT