Waste materials present in an ore are called ____ or ____ .

Explanation

**Step-by-Step Solution:**

1. **Understanding Ores**: Ores are naturally occurring solid materials from which metals or valuable minerals can be extracted profitably. They contain both the desired metal and other unwanted materials.

2. **Identifying Waste Materials**: The unwanted materials that are found mixed with ores are referred to as waste materials. These materials do not have any market value and are considered impurities.

3. **Terminology**: The specific terms used to describe these waste materials are "gangue" and "matrix." Both terms refer to the same concept of unwanted material found in ores.

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