Quote from Bernoulli:
Sorry, wrong. An exogenous increase in the amount of gold, ceteris paribus, will drive down the price of gold in dollar terms thus reducing its purchasing power. Thus an ounce of gold in the long term will purchase fewer goods than before the gold level increase, which is inflation. It might simplify things if you get rid of the dollar measure and just look at the amount of goods that an ounce of gold buys under different scenarios. Prices are after all just exchange rates between different sets of goods. The dollar is just their unit of measure.
This would be correct if the total goods and services available in the economy was static.
You're forgetting to factor in productivity. The goods and services available today are exponentially more than 20, 30, 50, 1000 years ago.
That productivity will far outrun any giant gold deposits that we happen to bump into.