The Mines:

In the completely dark mines, your GPS has connectivity issues, so have your partner pick up the [LANTERN] to provide light.

Grab the [GREEN HERB] near the entrance.

At the first junction, the right path leads to a dead end with a [RED HERB].

Proceed down the left tunnel until you encounter Majini and two Cephalos.

At the next junction, find two [WOODEN BARRELS] and two [WOODEN CRATES].

Before this junction, while wading through water, check the tunnel's roof for a [RUBY (PEAR)] you can shoot.

The left tunnel leads to a bridge with a waterfall. Turn right, look up and slightly left to find the [BSAA EMBLEM].

Before continuing, shoot the [RUBY (PEAR)] above the tunnel gate.

Continue and face more Majini, one of which transforms into a Cephalo.

At the next junction, either path rejoins quickly. The right path has a [WOODEN BARREL] and two [WOODEN CRATES] (one with a Snake). The left path has a [WOODEN BARREL], and you can shoot a [WOODEN CRATE] through a wall crack (this crate also holds a snake and is in a later area). You can also find [HANDGUN BULLETS x10] on the left.

Ahead, you'll find another Majini and two [WOODEN BARRELS].

Continue through the tunnels. As you see exit lights, check your left for a hidden passage. This passage contains the previously mentioned wooden crate with a snake, an additional [WOODEN BARREL], and a chest with a [DIAMOND (OVAL)].