Sand Buried Ruin of Khotan 61 - Jade pit with diggers, near debouchure of Yurung-kash - Khotan from early medieval times to today has been famous as the source of precious jade - so highly prized by Chinese - The fortress, custom's post on the Chinese frontier north of Tun-huang was called the "Jade Gate" - It is found, but rarely, in the Yurung-kash river bed like gold in Californian and Yukon rivers. Rarity makes it all the more worth while to scroung around in the rocks in hopes of finding a small piece.