The location of the secret lab near Perfection is at the coordinates given at time stamp 317 in this video:
https://youtu.be/qYwK2NnEk7U?t=317
Tremors: The Series | Episode 6 'Ghost Dance' - FULL EPISODE
N 36° 49' 00"
W 114° 40' 00"
These coordinates are here in Google Maps:
