What is 900 pounds of gold worth?
Get the current USD/Ounce of gold:
on 05/29/2010 it is about $1200 an ounce. (this number changes by quite a bit over the years)
Find out how many ounces are in a pound: 1 pound = 16 ounces.
So (900 pounds) * (16 ounces) * (1200 USD) = 17,280,000, about 17 million US dollars.
As inflation rises as the Federal reserve floods the united states with more paper money, this figure may double or triple in the next 20 years.
It was worth 50 pounds. English currency was a 'world standard' currency at that time; that means it did not really change its value. At that 'time' gold was worth 33.33 per troy ounce, so you could (arguably) convert current gold prices to 'pounds' of buying power on that date; to get a general idea of what it was worth.
Gold and precious metals are sold in TROY ounces- a bit different from everyday oz. There are 14.83 troy oz to a standard pound- or 1483 troy oz to 100 standard pounds. The US price for gold this morning is $1124.93 per oz. At today's prices (and they DO change hour by hour) 100 standard pounds of pure gold would be worth $1,668,271.19