If silver goes to $30 and stays there, there's still the low...

If silver goes to $30 and stays there, there's still the low cost heap leach silver mine option available:

http://www.argentminerals.com.au/about/

"As Argent pursues the exploration for base and precious metals to realise its goal of mining production, the low-cost silver-gold heap leach operation for which an Environmental Impact Statement (EIS) was submitted to the NSW Government in April 2013 remains in place as a fast-response, market-ready option, to take advantage of any precious metal pricing recovery that may occur. In the event that the precious metals pricing recovers to the levels prevailing prior to the EIS submission, Argent is well positioned to progress this plan through a rapid approval process and toward the commencement of production revenue, as an optional first stage along the growth path to a leading polymetallic producer."