largest undeveloped tungsten deposit ...

This is an interesting read and worth researching so will be able to see how RAU compares ...

"With an estimated 13 million tonnes of ore, the Mactung property is considered to have one of the world's largest undeveloped tungsten deposits.

The property was first discovered more than 40 years ago, with drilling beginning in 1968 and a "significant deposit" found in 1973. A road was also built through the high mountain passes into the property around that time. But by 1984, efforts to build a mine at Mactung stopped when tungsten prices fell..."

Full article at http://www.cbc.ca/canada/north/story/2007/11/05/north-mactung.html