You can make good gold in new world with flint right now because I think they nurfed it. All my flint locations have less flint and lower respawn times.
Because I think flint has been nurfed the gold price is going up on my server. Flint is also used on townboards so people seems to be buying it alot. If you want to make gold in new world you should sell flint now. It might be going up in price on your server aswell.
source
they keep on ruinning the game with every update and yes they did nerf it along with so many good farming spots