Tether ( Tether, the issuer of the world's largest stablecoin, USDTCRYPTO:USDT), has deepened its push into precious metals with a $100 million investment in Canadian gold royalty company Elemental Altus Royalties. This follows Tether's earlier acquisition of a 37.8% stake in Elemental for $105 million in June, bringing its total ownership to a controlling position.