Valar nods, "It appears to be a trigger for a trap perhaps?" 

"Most likely," Thelanis says, pointing out the plate for all. "Let's keep going but keep our eyes open, there may be other traps."

"Good eyes, Thelanis." says Draíocht. "Sounds like a plan to keep going."

Amiz appreciates Thelanis' scouting "I am glad you are scouting for us as I have a feeling, I would have stepped on the pressure plate without realizing it was a trap. I agree let's move forward with caution" 

He walks around the trap and continues onward. Letting Thelanis scout ahead if they wish to. 

Perception check 

6 - rolled in game log

Valar will also scan as they move, now concerned about more possible traps: Perception-6

Thelanis keeps scouting. [[Perception: 13]]

As you all make it around the trap, Thelanis comes to the end of the current tunnel and finds some wooden planks fastened to the side of the mine wall meant to be steps going down. Below you see many boxes and barrels seemingly filled with mining equipment and supplies; perhaps the store room Mycette mentioned earlier. Do you go down the steps and into the storeroom?

Valar adds, "Perhaps there is a hooded lantern, or even a mining hat with a light of some sort that can be used instead of wasting a good mage's hand to carry a torch." 

Some one can conduct an Investigation in the storeroom certainly once you’re down there.

Thelanis leaves the light above and climbs [[Athletics 15]] down to the storeroom with her devil's sight and investigates the area. [[Investigation 13]]

Amiz heads down the wooden planks as well to examine the storeroom. He will check the content of any of the crates or barrels that are open to see the condition of the mining supplies. 

Investigation 

2 rolled in game log

Valar will assist in the investigation: 9

Draíocht heads down as well. Seeing others are taking care of investigating the boxes, he offers guidance to the others while keeping an eye out of any unwanted guests.

Perception: min(6,11) + 5 = 11
//disadvantage from seeing darkness as dim light

You all make it into the storeroom. There’s a whole lot of mining supplies here. When Thelanis looks in one of the crates she finds a Hooded Lantern, complete with fuel. You can add that to the inventory of whoever wants to carry it.

It’s musty and damp in here, but the supplies are very well kept. Just as you’re done searching around, you hear a chilling scream from further into the mine, shrill and desperate.

Valar will take the hooded lantern, and secure it to his belt for light. "Now we can use the mage's hand for something more important then lighting my way." When he hears the scream, "Sounds there is someone in trouble! We should investigate, but be cautious."

Thelanis proceeds into the mine with caution in the direction of the scream.

Amiz readies his axe and shield as he moves forward towards the scream imagining that the whoever screamed may already be bleeding out on the floor. 

Draíocht moves with the group. "Agreed." he says to Valar, "Might be one of the dwarves or some other poor unfortunate soul."

If there's any natural phenomenon, he tries to find cover with that.
Stealth: 14

You cross to the other end of the storeroom and find a large wooden ladder at the end that leads down. You hear whooping and hollering coming from down there. Thelanis, if you’re proceeding with caution can you please roll a Stealth check and a Perception check to see if you can see what’s happening.

Valar will attempt to conceal most of the light, enough to see but not enough to alert prying eyes