A gold coarse ore stock-pile having a nominal sizing of 5cm contains an average ore grade of 5.6g Au per tonne of Quartz waste.?
Quartzite has a dense crystalline structure- which requires considerable heat and/or pressure over time. It usually forms over hundreds of years from nearly pure deposits of silicon. Quartz sandstone occurs much more easily than quartzite- because it can form even with just a little heat or pressure input. It can tolerate the presence of impurities, and their shape is large irregular cubes.
