2.27093139107 XAU comes from 661/291.07 (BTC price divided by minting cost), minting cost is actually what costs an investor to mint a XAU (you invest 291,07$ and you get 1 XAU).
If the price of 1g of gold is 54.80$ then 661$ would buy 661/54.8 = 12.06g. Can you please explain why you mentioned 11.6g?
Can you also please elaborate more on:
so the ratio of gold to xaurum increases.
Thx.
Xaurum ratio is determined by gold reserves/Xaurum money supply, because the gold reserves increase more than the money supply, the base value of all xaurum grows.