I figured the Miner in that one cavern kept respawning unlike the other miners. As such, I figured it had to pertain to him.
Drag him over to the area beneath/under the Science Vessel (Smoke) and I let him attack me 3 times, dropped a flare, and then killed him (attacking him and killing him there is probably all that's essential, but that's what I did!).
That causes mines (flares) to explode when placed.
Use your now-explosive-flares to clear out the broken machinery (i.e. siege tank) guarding the way to another cavern, which will enable you to access a new portion of the cavern. Head to the khaydarin (sp) crystal in the wall and you will get the belt. Bring it to the original and voila!
None.
