Yes, they are no different than any other coins that you may have in your pockets.
You need to empty them before you go through the metal detectors, but they would
not be considers to be dangerous .
Sure, you can take any coins you want to the Philippines. You probably won't be able to spend them though.
Ebay can be a good place to sell coins. If you don't want to do that take it to a coin collector.
Not many fake coins are made from real silver or gold. Take it to a jeweler to be tested, most will do this for you.
it is illegal in Mexico to take coins to other countries
No, banks do not usually buy silver coins. However, you can always go to a silver and gold dealer and exchange your precious metals for hard cash there.
All coins come from a mint. Casino coins are sometimes solid silver.
You could take them to some banks and get silver dollars or other silver coins for them. There were also places that would give you $1 worth of silver bullion.
There were proof sets made in 1974 and 1975 where all 8 of the coins were silver, and proof sets made during those years when none of them were silver. Assuming that your coins are in a set, check the 1 Cent coin - if it looks silver, then all the coins in the set are silver; if it looks bronze, then none of the coins in the set are silver.
Just recently with the advent of bullion coins such as the American Silver Eagle. Coins intended for circulation were never 100% silver because silver is simply too soft of a metal for coinage. They were 90% silver in American coins until 1964 for dimes, quarters and half dollars, but other than bullion coins, no coins are made of 100% silver.
Yes, many coin dealers and jewelery store owners will buy silver coins close to their silver melt prices, they will then either resell them to an investor at more than they paid for them, or sell them to a refiner who will take the coins, melt it down, take out the 10% copper and sell the silver bars either to investors or to industry which uses some of silver's unique capabilities to conduct electricity to make many electronic goods.
No British circulating coin has contained any silver since 1946. From 1919/1920 to 1946, all British silver coins contained 50% silver. Prior to 1919/1920, all British silver coins were made from sterling silver or, 92.5% silver.
Not many fake coins are made from real silver or gold. Take it to a jeweler to be tested, most will do this for you.