Dating as far back as 4,000 years, they were made by accident--naturally--by the dry climate in the salty Tarim basin. The oldest mummies from Cherchen found so far died about 3,000 years ago, while the oldest mummies found near Loulan died about 4,000 years ago.
Covered here in 2001.
The Curse Of The Redheaded Mummy
"They're not quite as old as the Scottish figurine, though (4500 to 5000 years old): "
Yup. Not as old...I was astonished about their location. The author of the book, The Mummies Of Urumchi, Elizabeth Barber is a fabric expert and she said that the weave, mfg techniques, ect were exactly like those used in Scotland.