 Metalla Royalty Streaming Ltd said it had now completed its previously announced acquisition, from an arms length seller, of an existing 5 net smelter return royalty on the South Domes portion of the Castle Mountain Gold mine in California - soon to be one of the USAs largest gold mines. On closing, Metalla paid US10 million in cash to the seller with the remaining US5 million to be paid within 20 months from closing, bearing interest at 4 a year. 