RE:USA grossly undervaluedYes.
USA is basically THE most undervalued silver producer in the sector, hands down. There is no better miner leverage to a rising AG price than USA.
As Boyko shows here in his excellent site, USA's rock value surpasses even that of Alexco's formerly producing world class Yukon property of Keno Hill, and its valuation per ounce is only surpassed by SSO, because SSO mines super low grade ore, and by Scorpio, because it is still more developer than producer.
The biggest fear with USA, is as ever, that it gets gobbled up because of its miniscule valuation.
https://www.goldminerpulse.com/silver-mining-valuations.php