The Quartzville Group are all accessible by 2wd, 2 of the claims are on paved road, the other is good gravel. In addition there is a big public area running from the upper end of green peter reservoir to just above the bridge where the road splits at the 25 mile marker, which is about a mile downstream from the claims. At the moment the area is closed due to the fires until at least the end of Sept. Call Salem BLM office for the latest updates.
Gold is hit or miss in the entire area..
Take a look at the pictures in the claim reports on finds. If you plan a trip up, let me know, would be happy to run up and show you around, as I'm one of the owners of 2 of the claims.
The only claim I can also say is accessible by 2wd is Golden cat ( paved all the way) up out of cottage grove. Haven't been to the others down south. Paradise is about 3 miles above cat, not recommended for a car, but a pickup should get in. Limited parking on paradise, and a long, steep climb to the creek. Limited maintenance on that road, been several years since up there and was rough then.