Newbery–Vautin chlorination process

The Newbery-Vautin chlorination process is a method for extracting gold from its ore through the use of chlorination. This process was jointly developed by James Cosmo Newbery and Claude Vautin.

Background
The process of extracting and reducing gold from pyrite in gold ores using chlorine gas was initially introduced by Karl Friedrich Plattner around 1848.

Precursor preparation
The Newbery-Vautin process and other processes based on chlorination were replaced by processes based on cyanidation, which used fewer reagents. Processes that are free of cyanide and emit less toxic byproducts have also been developed.