The Iron Mountain, Missouri. [Volume: 8, Issue: 2, 1888, pp. 124-125]

124

UNITED STATES ASSOCIATION OF

[VOL. 8,

The Iron Mountain, Missouri.
Plate IX was to accompany the description of the Iron Mountain, Missouri, which appeared in the current volume of the JOURNAL, pages 36 to 45, but was not completed in time for that issue.
It shows a general plan of the workings of the Iron Mountain
proper and also of the Little Mountain, the arrangement of railroad tracks, position of hoisting machinery, shafts, separators and
other buildings, as well as the disposition of the material taken
from the various openings. An effort has been made to show on
the plan the relative depths of the open cut workings by various shadings, and to assist in'an understanding of the extent to
which the excavations have been carried, figures have been introduced which indicate the elevations above ocean level. Thus the
top of the Iron Mountain is shown as 1,272 feet, while the lowest
point of the open cut is 1,082 feet, indicating a vertical distance of
190 feet. Other figures show intermediate points between these
two. The bottom of the shaft No. 1 in black ore to the east of
the large open cut in Iron Mountain is given as 941 feet, or 141
feet below the lowest point in the open cut. Similarly the top of
the plane near the old hoist on Little Mountain shows an elevation of 1,148 feet, while the bottom of the Little Mountain cut is
967 feet, showing a depth of open cut work of 181 feet. The
vertical section which is shown on the line A B will give a general idea as to the relative positions of the two open cuts, and also
show the general dip of the surrounding talus of what was designated in the description "old surface ore" on page 40. The
legend on the cut will indicate the amount of waste in tailings, which
have accumulated from hand sorting or from the operation of the separators, also the older dumps which are sufficiently rich to be hydraulicked, and some of the piles of ore ready for shipment, such as
' cone "and " jigged ore." It may be proper to note that in the Iron
Mountain proper the designation of East mine, South mine, etc., are
in reality different divisions of one large excavation, the operations
being practically confined to the open cuts works of the Iron Mountain and Little Mountain, and the underground work in the talus
above mentioned. The scale of the cut approximates in feet.