Osaka has received an anonymous gift of gold bars to repair the Japanese city’s aging water pipes. Mayor Hideyuki Yokoyama says the donor gave 21 kilograms of gold worth about $3.6 million.

TOKYO (AP) — Osaka has received a hefty gift of gold bars worth 560 million yen ($3.6 million) from an anonymous donor asking for its specific use: to fix the Japanese city’s dilapidated water pipes.

The gold bars weighing 21 kilograms (46 pounds) in total were given to the Osaka City Waterworks Bureau in November by the donor who wants to help improve aging water pipes, Mayor Hideyuki Yokoyama told reporters Thursday.

“It’s a staggering amount and I was speechless,” Yokoyama said. “Tackling aging water pipes requires a huge investment, and I cannot thank enough for the donation.”

The mayor said his city will respect the donor’s wishes and use the gift to improve waterworks projects.