Check this ICO backed by gold. They are not a Ponzi but although the coin is lower then the initial ICO value, they do have a real address, management, and registration and so far they are keeping investors informed and making progress with the funds raised:

COIN: MNTP

https://medium.com/@goldmint/

https://www.goldmint.io/

Coin is now traded in:

https://coinmarketcap.com/currencies/goldmint/

In hindsight, I wished I had put my $$$ here instead of Bitonnect!

If gold ever goes up, MNTN will do quite well as they have gold mines partnering, etc. Read the White Paper