The X-Cave Rock Climbing

Mapping to the GPS coordinates should get you to the parking. If not, here are the driving directions:

From Las Vegas, take Route 93 North towards Ely. After 13.8 miles, take a right onto a good gravel road. This road continues for just under a mile until you reach an intersection with the power lines. Continue straight across onto a narrow dirt road. As of Winter 2022, this road was in pretty good shape and was passable in an old Toyota Sienna. Slightly higher clearance would be ideal, but 2WD should be sufficient unless it has recently poured or the road deteriorates. This road continues for another 0.7 miles to a parking area in front of gate that was locked. Unless the gate happens to be open, park here and walk the rest of the road. The road ends at a Bighorn guzzler on top of a saddle. 

One approach beta (based on the author's experience of following the guidebook beta): from the end of the dirt road, continue straight (east) down the opposite side of the saddle, passing to the right of the rocky mound. Continue down the hill and into the main wash. Turn right, following the wash south. Remain in the wash until you can see the cave on your right, then cut across a small hill and drop down into another rocky wash that heads up towards the cave. At some point, this wash will fork. Take the right fork and continue up until you reach a trail at the base of the cliffs to the right of the cave. Follow this trail to the cave. 1.5 miles and ~45 mins of hiking from the parking at the gate, with a steep finish to reach the base of the cave.

Apparently, there is a faster approach if you stay a bit higher instead of dropping all the way down into the wash.