We came from the south - i15, exit 138 going East. Go through the big cuts then left on Summit Post Office Road (gravel). There is a RR crossing - the gate was open for us and looks like it had been open for quite a while - cross, then continue past the little memorial up to the next tracks and cross them - go right along the frontage road to get to both the southern end of the double claim and to the road getting to the middle claim and the Shadow Lode.
If this is closed, head back (it's like 10 minutes max) to i15, go north to Ranchero Road, right before the RR tracks is the frontage road - take a right onto it and just cruise. It's NOT difficult when it's dry. I didn't hit 4x4 at all. You'll come across a controlled crossing - that's not what you want. stay on the frontage road another 10 minutes and you'll get to the claims. This is quite a bit longer, but is still quite an easy drive.