A typical iPhone is estimated to house around 0.034g of gold, 0.34g of silver, 0.015g of palladium and less than one-thousandth of a gram of platinum.
2018 fiscal year, Apple sold more than 217 million iPhones. so about 73.78 tonnes of silver
73.78 tonnes of silver @spot price $1,121 per kg, is $82,707,380 worth of silver.
you also have to take into account the unsold portions made. if silver price hits 10x manufacturers will have to adopt made to order principles to survive
