Buchanan Mines, Harvey County, Oregon
Note: Had been labelled as Robins Ranch, Bums Bed, Orange
Creek Mountain, & Stinking Water Mountain.
The mine was originally opened to mine
the cinnabar deposits and the thundereggs were considered a
nuisance before it became a fee-dig site. When
the mine was first opened, several beds of thundereggs with
fully silicified hard shells
have been found, but as the mining progresses into lower levels
(and other beds), those
with "rotten" and porous unsilicified shells are becoming more
hence, "New Buchanan thundereggs". Some thundereggs found there
contain reddish cinnabar inclusions while others contain either
messy or neat horizontally banded agates and it's tricky to tell
which way to cut since they
are quite rounded without any ridges showing. The "messy" look
from cracking and flaking of each silica when it dried after
deposited (like mud). The site is now closed to collecting.
Click on the pictures to see larger
and closer-up pictures.
Rough Appearance: Looks like bunch of bubble clustered
ones have green to brown colors while new ones have
"bleached" tan color.
Agates are typically messy-looking waterlines sometimes with
tints due to cinnabar inclusions.
shells, typical of Old Buchanan eggs
recent finds with unsilicified shells
bit of reddish spots, possibly cinnabar
Buchanan identified by white 1st band
and completely silicified shells
Rich in cinnabar inclusions