2017 Maple Leaf Planet Earth Canadian Silver Maple Leaf 1 oz Pure Silver Coin. MAPLE LEAF PLANET EARTH - 2017 Canadian Silver Maple Leaf 1 oz Pure Silver Coin - Black Ruthenium & Color. This beautiful new coin has a very low mintage. The coin is colored on both sides and coated with Black Ruthenium. All this together with the box and the noble certificate makes a perfect present and a worldwide searched collector's piece.Enhancement was done by a private mint in Germany.