The content of silver in the earth's crust is very small, only 1 × 10 -5 %. In nature, silver is present as a single natural silver, but mainly in the form of a compound. The main mineral of silver is argentite (Ag 2 S), sulfur and copper silver (AgCuS), antimonial silver (3Ag 2 S · Sb 2 S 3), silver sulfur arsenic (3Ag 2 S · As 2 S 3 ), chlorargyrite (AgCl), silver bromo-chloride (AgCl · AgBr) gold silver and tellurium and the like. Silver minerals are often symbiotic with sulfide minerals of colored heavy metals such as copper, lead and zinc , and have a comprehensive recovery value. Natural silver is mostly fine, and large ones are rare. According to reports: in 1875, a natural gold block weighing 5000kg was found in a mine 300m deep underground. Chile has also found 1420kg of flake-shaped natural silver.
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