It's not really. The coin stated that it's backed by gold, but it's not backed by gold. There has been 3 or 4 projects out there like this one that failed since it wasn't actually backed by gold (look at XGR for instance). The price is dropping due to manipulation shananigans, you'll never get a full circulating supply on an exchange, if it was all there it wouldn't have been manipulated to high prices and being dumped. I.e if the full circulating supply was on exchanges, people couldn't manipulate the price high thanks to massive sell pressure and the need for colossal volume which hawkens back to the fact that you should never allow a small group to control a coin like this (and they wouldn't be able to if the full supply was on exchanges). I sold off some too and i'm slowly selling with around 982.87752 left but when it gets too low, i'll probably stop
https://bitcointalk.org/index.php?topic=641064.0the only difference is that he actually wanted to get the coin backed by gold rather then having a gold value equal, but as you can see it just doesn't turn out well usually.
https://coinmarketcap.com/currencies/goldmint/here's another one, but this one is an ERC-20 token
not trying to hate on your project, but unless a coin has actual gold to back it, it's doomed *shrugs*
TLDR : The coin isn't too unique and it's prone to manipulation shananigans