electronics use copper for pretty much everything
silver only conducts slightly better and is barely used at all in electronics
Anecdotal evidence suggest there is one ounce of silver per 1000 cell phones. So yeah, there's barely any silver in ONE cell phone.
The point is, everyone has a cellphone or two, and we replace them probably once a year on average.
So, lets say one third of the planet owns a cell phone. 2 billion phones. That's 20,000 ounces of silver gone every year. Most of it will never be recovered.
That just for starters. Photographic film, solar panels, TV screens, ipods, microwaves, GPS, the list is endless. Is 200,000 ounces lost per year a reasonable number? That's two million ounces every 10 years, and the numbers will creep upwards.
The other problem is that because the amount of silver used is so small per device, even a large spike in the silver price would not cause a rise in electronics prices. So consumers will continue to buy, and factories will continue to produce.
How much silver is left in the ground? 100% of annual silver production is consumed in some form. There are no mining reserves left over.