As the Miners bring the Kill Team to the mineshaft, it's turned into a somewhat impromptu parade as the citizens cheer as they pass. After about 15 minutes of driving through the hab center of town, the Kill Team is brought to a mine built into a hill. It descends into darkness. Everyone engages preysense / darkvision, and moves into the mine.
"Noble astartes, simply follow this shaft down. When you reach a large black wall, that's the place. Our prayers are with you, Astartes!" says the PDF commander.
"YOU'ZE PLANET'LL BE CLEANZED, DA 'ORRORS WIFIN IT TAKEN FROM IT IN 'IS NAME." yells Kroz, "an' inta our krooza..."
"What was that, Astartes?"
"Nuffin..."
Heading full speed down the mineshaft, the Kill Team can see numerous mineral deposits, mostly iron and other metals. On occasion, you see shiny rocks in the outcroppings.
"OI. WOTS DIS?" yells Kroz, picking up some of the shiny rocks. Grakgut makes Chymistry, and determines their mineral composition to be diamond, sapphire, and other rare gems. Full examination would require krooza's lab functions. Continuing on, the kill team note a solid jet-black wall in the mineshaft. They also see an explosion hole.
And then things get weird.