Guys, read beyond the first two sentences.
Dragon can deorbit 3 metric tons. The Shuttle massed 2,000 tons and could deorbit 14 tons (plus the 2,000 tons of the Shuttle vehicle itself). Let’s say that we can build an upscaled X-37 (an unmanned shuttle) to deorbit 50 tons for a reasonable price.
Values are in millions of dollars.
Note that deorbiting silver would be a complete waste.
If you can find 50 tons of Platinum, extract it in space and dorbit it, you’re looking at $1.7 billion for pure metal. Adjust depending on your ability to refine the stuff in space. Then there’s the price adjustment that would take place when a bunch of new metal is introduced, with more expected from future mining.
By the way, 50 metric tons of gold has a volume of 2.6 cubic meters.
Won’t happen. Without purpose. Too expensive.