If you are looking for Information about PSU Clementine, Go check their Wiki
Vol Coins
From The re-PSUPedia
Vol Coins are a special currency used exclusively at Casino Voloyal. Players are able to collect a daily allowance of 100 bronze coins from the casino to use as they see fit. Coins can be gambled at Voloyal's massive roulette wheel or numerous slot machines as well as traded for special items at the Vol Coin exchange counter. Please see Casino Voloyal for a complete list of all currently available items and their exchange rates.
Vol Coins come in three types: bronze, silver and gold. One hundred bronze coins is the equivalent of one silver. Likewise, one hundred silver coins equals one gold.