This guide shows the location of all the collectibles (1 Spartan Cores, 2 UNSC Audio Log, 2 Banished Audio Log, 1 Mjolnir Armory) in the Riven Gate in the Halo Infinite campaign.
Also Read: Halo Infinite Collectibles Guide
1) UNSC Audio Log 1/2
It is up the mountain east of Riven Gate as shown in the pictures below.
2) Banished Audio Log 1/2
Go inside the building as shown in the picture below. Then go to the room on the left side, where you will find the audio log leaning against a wall.
3) Banished Audio Log 2/2
This one is inside the building highlighted in the picture below. The building is connected to a tunnel. The audio log is at the start of the tunnel.
4) Spartan Core
After collecting the previous Audio Log, take the tunnel and go straight to the end of the path, where you will find the Spartan Core as shown in the picture below.
5) UNSC Audio Log 2/2
You will find a cave on the mountain wall west of Riven Gate as shown in the pictures below. Grapple to the top of the mountain above the cave. Here you will find the audio log as shown in the third picture below.
6) Mjolnir Armory 1/1
It is at the top of the mountain south of Riven Gate as shown in the pictures below.