This letter, sent to Dan Hestetune (a mining engineer at Soudan Mine), describes areas of interest between the No. 8 Shaft, 23rd and 25th levels. It explains where ore laid between the various levels and answers the question about whether the mine should continue east for more ore.
The mining companies would conduct diamond drill core drilling to determine the geology of the rock beneath them. This letter describes the rock found as the mining company was looking at the possible development of the No. 8 Shaft, 29th level (Montana). The letter was sent to I.L. Reid, Supervisor of the Minnesota Explorations, Oliver Iron Mining Division located in Duluth, Minnesota.