The Gwalia Gold Mine, now open pit, is 290 metres deep and 750 metres wide! The mine has produced more than 4 million ounces of gold and there are about 2 million ounces left.  The impact on the environment is just as awesome as the engineering feat but in a different way.  For an overview of impacts read this.

Gwalia Gold Mine – #Inktober2016

🙃

Helen