"In a research note published Sept. 24, Analysts at UBS said...

"In a research note published Sept. 24, Analysts at UBS said that if the referendum passes the Swiss National Bank would have to buy about 1,500 tons of gold over the next three years. “1500 tonnes equates to half of the world's annual production,” they said in the report.
“That kind of gold buying would put what we’ve recently seen in China to shame,” said Hansen."

Last year China bought 2000t, so i don't see how 500t would put China to shame.