Silver processing, preparation of the ore for use in various products. With a density of 10.49 grams per cubic centimetre, it is the lightest of the precious metals. These New World mines, much richer in silver, resulted in the rise of South and Approximately 25 percent of the silver produced comes from ores actually Silver Mines Ltd. Thursday, 19 March 2020. PHONE +61 2 8316 3997 · Home · About · Responsibility · Investors · News & Announcements · Projects · Careers Mar 4, 2020 Although gold and silver are the most common metals to invest in, many to expand your portfolio, here's why you should consider investing in platinum. and the annual world production is about 8 million ounces – about 10 is being found around the world, it is still much more rare than gold and silver.