Material originating directly from the earth that contains gold which has undergone a chemical reaction with oxygen and other elements. This substance has not been processed to remove impurities or concentrate the precious metal. A typical example would be a rock sample taken directly from a surface mine where the gold has been exposed to weathering and oxidation processes.
The significance of this type of mineral-bearing rock lies in its abundance and potential as a resource. Historically, it has been a source of wealth and continues to be relevant in modern gold extraction operations. Efficient and cost-effective methods for processing this material are continually sought after due to its widespread occurrence.
