Oh boy, thats quite a large area!
I'll give you what I have thats near you, and a few scattered about the area you described. It'd take hours to put down everything in the whole area...
12-3-1981 A meteorite seen by many observers fell. Many report it last being seen SW of Silverton.
There is an immigrant camp on Gale creek- Approximate location is NW 1/4 of sec 36, T4S, R11E.
On your gold mine, there is one in the Cheeney (sp?) creek area with a reported production of 48 ounces of gold. Sec 20 , T36, R7E This site may help you more on that-
http://www.geocommunicator.gov/NILS-PARCEL2/map.jsp?MAP=MC
There are giant thundereggs high on east bank of Deschutes river. Just north of Maupin there's a campground called Oak springs. They're in this area.
A little NE of Oak springs campground is Shears Bridge. This is an ancient fishing area with an old stage road visible on the west side.
On the Columbia river at the mouth of Chenowith creek on the east side is an old immigrant camp.
At the top of Mount Hood is what they call a fumarole- a hot spring. 194 degrees, no swimming, LOL!
SSW of there is an area called Swim. 80 degree springs in sec 24, T3S, R8 1/2 E
Also in the Cascade locks to Bonneville area, this was a portage for immigrants in the 1840's. Highwaymen and unscrupulous types took advantage of many of the weary immigrants. There may be caches in this area.
Anomolies- there is the meteorite mentioned earlier, plus these-
9 miles NW of the town of Christmas valley, there's a place called Crack in the Ground. Year round ice. S edge of Four Craters lava field.
Big Arch- natural bridge on rim of Green basin. Phantom bridge, follow Forest circus signs off French Creek. I believe this is near Sardine Mountain, Marion county.
Lava cast forest- Lava flowing through virgin forest formed hundreds of molds in the area south of Bend and North of Paulina lake.
