East Rand Proprietary Mines (ERPM) is a 125-year-old underground gold mining operation on the Witwatersrand Basin at Boksburg, to the east of Johannesburg.

A world class high grade gold deposit remains with existing in situ resources (SAMREC compliant) of 63 Moz, including; - Measured & Indicated resource of 13.6 Moz at 6.7g/t Au - Inferred resources of 50 Moz at 4.92 g/t Au.

The Cason mine dump was once the world’s highest manmade mountain.

Recent production figures:[2] The ERPM engineered many mining techniques which are still in place today, including "Long Wall Mining".

The mine also built the world's largest ice factory which produced up to 8,000t of ice daily to cool wall rock temperatures (50-60 deg Celsius).