The main silver producer on the ASX would be CXC. Other than that there are specs such as MAR, CQT and SVL. BHP also produces silver, but I don't expect you would invest in it for the silver alone.
Not sure if the new ETF for silver is listed yet, but my preference is physical.
I just bought a couple more kg bars from Ainslie today for immediate delivery. I'm expecting that run shortly too simjojim.