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

Hint 1 of 7:

You'll need to find several pieces of a broken Rock Filet, and assemble them.

Hint 2 of 7:

One piece is located in the Center Pit Staging Area.

Hint 3 of 7:

It is located to the left of the green barrels that are blocking the
Abandoned Tunnel.