How to turn gold ores from stone into pure gold and teach me how the methods…?
To explain this, you must first understand that gold ore exists in two significant forms: 1. free-milling gold in host rock. This means that the gold exists as the element within the rock or vein, and can be extracted by crushing and sorting 2. non free-milling gold – the gold is present within the crystal structure of another mineral. Free milling gold is extracted by several methods. Historically, coarse gold was extracted by crushing the ore to sand size and separating the gold using water to wash away the lighter rock and mineral. Cyanide or mercury were used to dissolve very fine gold which was recovered by a variety of techniques. These techniques (with the exception of mercury usage) are still used today. Non-free milling gold is inevitably problematic to miners. In some cases it can’t be economically extracted, because it is too well bound up in the host mineral. However, in many cases it is extracted by chemically breaking down the host mineral (commonly pyrite) which releases
