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From the 1870s to 1964, all US silver coins were made of an alloy of 90% silver and 10% copper regardless of denomination. There are 16x25 = 400 ounces in 25 lbs so 90% of that is 0.9 x 400 = 360 oz.

But be careful !! Silver is normally weighed and priced in troy ounces which are slightly heavier than standard US ounces. The approximate conversion factor is 1 US ounce = 0.91125 troy ounces, so the silver in the bag would weigh 360 x 0.91125 = 328.05 troy oz.

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Q: How many ounces of silver are in a mixed 25 lb bag of pre-1965 US coins?
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