Funny, I might have even owned ZN via my Fidelity Total Market Index Fund I've had for close to 35 years.
Sort of shows the effort some Fund managers put forth. Need a low weight oil stock from column E of the Russell selections - eh let's pick ZN out of the blue. Who cares if this Microcrap oil stock never generated 1 drop of oil revenue in over a decade of existence.
Really, if you had the itch to buy a "small" oil stock just for the hell of it, would you buy a Microcrap oil stock whose only accomplishment has been to drill one dry hole after another over a decade? Where their last dry hole they used 2D (bought from whomever) because to do 3D was too expensive. So they drill the dry hole, and then decide to perform 3D seismics after the fact. Now there's a winning strategy! At least your Fidelity Fund must have thought it was neat. Yes, it pays to review what's in a Fund.
ZN is one of the more entertaining Microcrap scams.
The Jewel of the Mind is Colored with the Hue of what it Imagines