Investing in silver and gold
Firstly, we can't recommend any companies specifically. If you want to invest in the commodity you can look for the exchange-traded funds (ETFs). Using the ETF filter tool available on our sister website Eureka Report, a search for commodity ETFs brings up the following for gold and silver:
QAU - Betashares Gold Bullion ETF (A$ Hedged)
GOLD - ETFS Physical Gold
PMGOLD - Perth Mint Gold
ETPMAG - ETFS Physical Silver
I hope this helps and if you are interested in commodities the Eureka Report has a dedicated contributor by the name of Tim Treadgold that focuses on them.