One thing that made the Eagle Mine unique is the underground mill, left of this picture. As the rocks moved down the mill, they would be turned into finer and finer powder.
Here, the concentrated gold (and silver, and zinc, I would guess) would be loaded into trucks bound for the smelter.
The bits with handles are the filters with screens of different sizes. Larger grain particles would be stopped at the top for further reduction via the mills, while the powder at the bottom would be run through another bolter–one of the refinement stages in flour production.
In what Studebaker called the ‘Materials Building’ are these giant concrete bins of fine molding sand, there for casting metal parts using the molten metal from the adjoining building. On the far left side there is a train track and once upon a time a gantry crane traced the room under the roof
On the National Mine property are two shafts, both serving the same workings. This one seems to have gotten some upgrades in the 1960s, judging from the condition of the metal.
The hoist signal dangling beside the modern mine shaft would ring a bell next to the giant electric motors that would send the men and machinery into the underground.
The bathtub fell into the basement, ala The Miller’s Tale. That’s right. Chaucer.
One of the paper warehouses, with snow blowing across the floors.
Looking through the loading platform of Frontenac Mine toward Black Hawk. In 1900, you would see Druid Mine on the left and Aduddell on the right.