We do know that the reforging of the gate of Minas Tirith would have needed quite a lot of mithril. However, the LotR Epilogue is again our best guess. These are Sam's notes on Frodo-lad's question:
"Moria: I have heard no news. Maybe the foretelling about Durin is not for our time. [i.e. that he shall wake again from sleep] Dark places still need a lot of cleaning up. I guess it will take a lot of trouble and daring deeds yet to root out the evil creatures from the halls of Moria. For there are certainly plenty of Orcs left in such places. It is not likely that we shall ever get quite rid of them." (HoME IX, xi)
Perhaps expeditions similar to Balin's, heavily armed, and only undertaken to get mithril and other treasures, were carried out.
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