Canadian Geographic, Nov. 1942, Maps

Shows the location of the Steep Rock Iron deposit, in relation to
the famous United States ranges, the Mesaba, Cuyuna and others

Locates the three known orebodies which may be extended
for additional drilling and mining operations

A more detailed sketch of "A" ore zone,
indicating drill hole locations.br>

In the upper left hand corner of the map, it says :
"The average depth of the 'outcrop' of this orebody is about
335 feet below the surface of the lake"

A plan of the "B" orebody which will be the first mined
by open pit methods.

In the upper left hand corner of the map, it says :
"The average depth of the 'outcrop' of the 'proven ore' section
of the orebody is about 170 feet below the surface of the lake"

This sketch outlines the construction work which will have to be done in by-passing the Seine River around that section of Steep Rock Lake which is to be dammed off and pumped out. Earth and rock cuts will have to be excavated and the power plant eliminated. The pumping job will be one of the largest of its kind attempted in North America, but it will be done by stages, and to the hydraulic engineerd it is merely an interesting task. Note how the orebodies follow the bed of the lake which is contorted by folds in the structure.