Mining Claims Level C

Hint: What's there to do here?

Hint: I can't "mine" any of the gems on the walls.

Hint: How can I get a Rock Filet, so that I can obtain ore samples?

Hint: The tunnel ends in a dead end.

Nested hint: When I go down a level, I'm stopped by a monster.
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Nested hint: How do I overcome a rock parasite?
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Hint: I see a sunflower on the wall, near my uncle's claim; what does that mean?

Nested hint: I see a River of Light at the end of the tunnel, but I can't reach it.
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Hint: I have the barrier device, but it's not doing anything.