PENSCO Trust Company, an alternative asset custodian, has expanded its capabilities to include holdings of gold, silver, platinum and other precious metals in tax-advantaged retirement accounts.

The new abilities of PENSCO result from a deal with Delaware Depository, a provider of precious metals custody services, which allows investors with self-directed IRA accounts to hold precious metals at the depository firm. The Internal Revenue Service doesn’t allow investors to take hold of their precious metals owned in IRA accounts, but allows a third party to hold the investment.

“PENSCO’s relationship with Delaware Depository provides investors with new opportunities to build wealth by investing in precious metals in retirement accounts,” said PENSCO CEO Kelly Rodriques. The firm is “committed” to offering a comprehensive suite of alternative asset custody services, he added.

Alongside the launch of its precious metals service, the firm will hold a webinar on these assets and how they can play a part in tax-advantaged retirement accounts on December 6.

PENSCO has around $10 billion under custody.