Enter Benson Canyon Road into navigation. On your way up EP110, you'll encounter a large parking area with a fire ring dead center. This area is the Taft Prospectors parking lot.
Take the dirt road past the wooden outhouse, and follow it straight until you encounter markers for EP190.
Follow EP190 all the way south, until you have reached the gulch. Do not drive out onto the gulch. Park someplace safe, and walk in.
I've spent about a month, trying to locate ADK, since I have an electric car.
If I'm correct, I found the western border of the claim, near large dig sites. It's a rusty metal pipe, up on top of a ridge.