Figure 4. Scheme of the sequence of working out layers of rock mass with
surface miners
Source: developed by the author
Subsequently, in the corresponding sequence of the above, the following layers
of rocks are carried out: 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25 after which the
following layers of rocks are worked out: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26
respectively.
After removing the layer of rocks 26 the layers of rocks 27 and 28 are worked out
until the full run of the ledge to its full height.
As a result of combine harvesting, the above-mentioned technological scheme
increases the productivity of mining equipment.
In this technological scheme, as in some others, the advantages of using combine
harvesters are enhanced by providing a significant front of work. Continuous operation
of the milling combine with the minimum number of auxiliary operations and idling is
ensured, which increases its productivity. In the case of the development of deep pits
using transport systems for the development of fields using this technological scheme,
favorable and rational conditions are created for the operation of layer-by-layer milling
combines.
CONCLUSION
The development of a rock massif of iron ore deposits by mining combines of the
milling type is possible without carrying out the complex of drilling and blasting
operations. According to the proposed technological scheme of the layout design of the
ledge, the working area of the entire width along with the prisms of possible collapse
is worked out. Due to this, it is possible to perform layer-level removal of rocks of the
horizontal or weak-down working platform of the ledge with given operational
parameters of the elements of the development system. It allows to effectively adapt
the milling combines to the existing technology of open development in the existing
- 520 -