I'm a full-time player in the Canadian junior mining market, so SIL is a little outside my investment universe, but similar government threats pervade much of the world.
Vancouver's Fraser Institute has just completed its annual survey of World Mining Companies and ranks Bolivia between California and Zambia in terms of overall 'policy' threat, these low-ranking jurisdictions being particularly subject to socialist scheming.
Such political threats are an unquantified fundamental of mining companies.
SIL has recovered half its loss, and is down 17% at the moment. CDE was hit this morning, too, down 15% because it has a property in Bolivia, and has recovered to around down 7.5% currently.
All the silver stocks are doing somewhat badly at the moment, apparently because the money is going into the ETF instead of stocks. I doubt that will last too long, however.