Ya que ultimamente esta la fiebre del oro en el foro gracias a LBal creo que esto viene como caido del cielo. Alpari reduce el incremento minimo para operar oro y plata de 5 centavos a dolar a uno. Mi ingles no es el mejor del mundo por lo que mejor lo copio tal cual.

Alpari (UK) is pleased to announce a change to the minimum gold price increment from 5 US cents to 1 US cent (USD0.05 to USD0.01). This will provide traders with tighter spreads and improved depth of pricing when trading gold and silver against the US dollar.
At the same time, you will also notice that gold and silver quotes have changed with the addition of the third decimal. For the time being, this will not impact your trading* as the third decimal will always be zero.

What does this mean?

This means that the minimum price increment for gold is now USD0.010. For example, XAUUSD (gold against the US dollar) price movement would be 1615.120, 1615.130, 1615.140 etc.
The minimum silver price increment remains unchanged at USD0.010.The minimum trade size for gold and silver also remains the same: 0.1 lots on Classic account and 0.01 lots on Micro accounts.
Foro de Forex Trading United