Aug 03, 2020 In their new book The Price of Gold, Steve Cagan and Mary Kelsey describe how these practices were changed once mechanized mining was introduced to Choc . While traditional panning for gold minimally affects rivers and forests, mechanized machines and the use of toxic chemicals are creating grave environmental, health, and social damage.Free consultation 40 years of industry experience providing one-stop solution
Leavve A Message
Note: If you have any needs or questions, please leave a message, and we will reply to you as soon as possible.
Address:Zhengzhou High-tech Industrial Development Zone, China