Difficult question you are posing.
If the pins were manufactured after 2002, the plating should be almost identical from one manufacturer to the next. Prior to 2002 the gold plating was actually a little heavier. It was the jump in gold prices that caused industry to respond by plating as little gold as possible. So there is variance, but not like you might think. It's not done willy-nilly, there are industry standards that must be followed.
Different types of pins will yield different values. If you have a lb of really thin pins this will yield more than a lb of really thick pins for example.
In the future when you post these types of questions, it's always best to include pictures. If you are asking, without pictures, then all I can do is give you a range of values. To be clear, we are talking about gold pins used in connectors for electronic equipment, not connectors.
The average range for 1 lb might vary between .5 grams all the way to just over 2.0 grams. Certain types of pins will yield a lot more depending on the age, and what the pins were plated for, for example military grade pins will yield far more value than regular computer pins.
Hope this helps, and good luck.
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