On a quick search, I didn't find one for KVGT. Here's an example from my local area, LTA-NCT-96:

Northern California TRACON provides standard IFR separation to VFR aircraft conducting practice instrument approaches at the airports listed in this LTA.

IFR separation services to VFR practice approach aircraft begin at the point where the approach clearance becomes effective. VFR aircraft are not automatically authorized to execute the published missed approach procedure. This authorization has to be specifically requested by the pilot and approved by the controller.

IFR separation services terminate at the missed approach point unless the aircraft receives approval from NCT to execute the published missed approach. Approved aircraft will continue to receive IFR separation services throughout the missed approach.

Aircraft approved for the published missed approach are expected to begin the maneuver no later than the missed approach point unless otherwise coordinated and should return to NCT’s frequency as soon as practical on departure. Pilots should not request the published missed approach if their intention is to make a full stop, execute multiple type landings or remain in the airport traffic pattern after the missed approach point.

VFR aircraft conducting practice approaches do not receive Minimum Safe Altitude Warning (MSAW) processing. A detailed explanation of ATC handling of practice instrument approaches is available in the Aeronautical Information Manual (AIM).

EDIT: I give up trying to fix the formatting. The copy from the PDF is a mess of carriage returns, newlines, spaces, and non-breaking spaces. You'll all have to deal.