I defer answering that to TsNIGRI & Arkadia as I always defer any nonprofessionals judgement to recognized industry experts, as opposed to a few posters here that would seemingly question their own mother's judgement for giving birth to them (hehe)
"The geological 43-101 report states that the assets of Krong are $3.9 billion US. The findings of OOO BK Arkadia demonstrate a business value to Krong of $2.8 billion US." http://www.marketwire.com/mw/release.do?id=814335&k=aurc