Congresswoman Judy Chu will speak at a fundraising event to support a referendum effort against an Azusa mining plan.
The potluck picnic fundraiser will be at 3 p.m. Saturday at the Duarte Historical Museum, 751 Encanto Parkway.
Chu has been an opponent of the mining plan after she heard numerous outcries from Duarte officials and residents at various meetings.
She has since condemned the plan and the documents surrounding it. The congresswoman represents both Azusa and Duarte.
Funds raised the event will support the referendum effort. Officials with the campaign have said they need the money to pay for copying costs and legal fees.
With its approved plan, Vulcan swapped its east 80 acres originally permitted for mining for 80 acres on the western end of its property near Duarte.