Unfortunately I havent had time for much modelling these days, but thought Id share a few pics of a 1/4" scale Depression era mill in southwestern Oregon I did for an architecture class. The prototype was built largely of locally available materials, like peeled logs and large western red cedar shakes. Similar to ball mills that largely replaced stamp mills , this circa 1933 rod mill used a large rotating cylinder with rods in it to crush the gold ore, before it was sent to two Wifley tables and finally to flotation tank. This mill recently collapsed, but enough remains to take a few measurements and make a reasonable model:
In theory the rod mill was more efficient than a ball mill, which was more efficient than stamp mills...In practice rod mills didnt work as well, at least the models that were used in sw Oregon: One rod mill near Jacksonville Or only last two weeks before the management junked it. Another near Cave Junction could only handle a ton or two a day of ore, even though it was "rated at 25 tons, and this mill never did much. In an interview during the 1950's the owner reported that only a couple thousand dollars of ore was removed.
Duane-a beautiful model of a seldom modeled (if ever) mill. It just shows that you don't need a large structure set on a steep hillside (gravity stamp mill), to get the job done. Do you still have this model and if so, how about a couple of more pix. This looks like something I would be interested in building.
____________________ It doesn't matter if you win or lose, its' how you rig the game.
Unfortunately, I don't have any other pics of the model, as it is at school. Architecturally, it is somewhat unusual not only that it looks almost "Prairie School" but also because it is "earthfast" construction. There is no foundation, the posts are simply stuck in the ground and everything attached to the posts. A couple of footnotes on it, when the state geologists did a report on the mine the ore in the ore bins basically had no gold in it, but one of abandoned stopes had fairly rich gold, but the miners were looking in the wrong spot. I don't think the miners were too commited to the mining game as the dump outside the window of the mill is full of 1930's and 40's Pabst and Ranier cans...