About 1.5¢ for the original bronze coin and maybe another half a cent for the plating. Gold plating is extremely thin, usually measured in hundredths of a millimeter, and it would cost more to remove it than you could get by selling it.
The US mint never made a gold 1 cent coin, if it is gold plated it's a novelty coin that has no extra value.
U.S. pennies have never been made of gold. A 1972 penny is worth about 2 cents due to copper content.
If the surface has granularity to it or just looks strange is been treated with an acid and has no collector's value.
Thin Thin Khaing was born in 1978.
Pretty much non-existent. Post-1982 pennies are zinc with a very thin copper coating and contain very little copper of any economic value.
Penny Lane
To start with a 1990 Lincoln cent is NOT copper, they have been made from ZINC (.992) with a thin copper (.008) plating since 1982. The coin is face value.
A layer of zinc coated with a thin layer of copper.
There are no 1984 pennies made from steel -- they were made from a zinc core with a thin outer copper layer. So you have a penny that either is missing its copper layer (worth a couple dollars) or one that has been plated by somebody with zinc, silver, or some other similar colored metal (no collector value). If your penny was made of steel, it would stick to a magnet -- try it!
You can tell if a penny is made out of zinc or copper by the date on the penny. If the date is before 1982 then the penny is 95% copper. Pennies dated 1983 or later are 97.5% zinc with a thin copper coating.
No
A penny is made of mostly zinc with a thin copper coating. Since 1982, the United States penny has been made of 97.5% zinc and 2.5% copper.
It consists of nothing. Just thin air and super glue.
All pennies since 1983 are made almost entirely of zinc, covered with a thin coating of copper. Therefore, what you have is either a zinc penny that did not get its copper coating (worth abuot a dollar), or a normal penny that has been silver plated (no added value). You should be able to determine this by weight. A normal penny will weigh 2.5 grams. So if yours weighs less, then it's missing its copper coating. If it weighs more, then it's been silver plated.