You can type the words "spot price" followed by the metal you're interested in (gold, silver, platinum, etc.) in the search window of a site like Google or Ask. You'll be directed to loads of sites that quote the current buy and sell prices for one ounce of the metal in question. Multiply that by 0.77+ for a rough idea of what yours is worth.
Remember that you'll get a less per ounce for a single coin or bar than if you had many pounds.
.77344 Troy ounces
Peace silver dollar specifications: .77344 troy ounces, 38.1mm diameter.
There are 12 Troy ounces in a Troy pound, so 100 Troy ounces is 8 1/3 Troy pounds. A Standard (Avoirdupois) pound is equal to 0.8229 of a Troy pound, so your 100 troy ounces comes out to 6.857 Standard pounds. See the related links for a conversoin calculator.
$53,000
1200.00us dollar
There are 12 troy ounces in one troy pound.
Five troy ounces is 5.4857 ounces.
Silver is worth about $18.50/oz, so about $180.
There are 12 troy ounces in 1 troy pound.
12 ounces in troy weight is equivalent to 0.9375 troy pounds.
There are around 14.5833 troy ounces in 16 avoirdupois ounces.
1.9 ounces = ~1.732 troy ounces.