2016 Niue 1 oz Silver California Gold Rush Proof 1 OZ Brilliant Uncirculated Photos in this listing may or may not be stock photos. The photos are meant to be an indication of the product you will receive. Coin Highlights: Contains 1 oz of .999 fine Silver. Comes in a capsule from the mint. Maximum mintage of 1 500 coins. Obverse: The weight purity country of issue and the Queen's effigy.