We don't have any plans currently for directly calculating this, though I'll pass this feedback onto the development team; however, if you want a work-around for adding gold or other metals that you already know the value of, you can add them as Other Property when you go to the Accounts menu at the top of the page when signed into Mint.
Go to Accounts, then the Other tab, and add a new item, then select Other Property. In the dropdown, there's an option for Gold. You then enter its value and it is added to your net worth.
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