MacLean, a former Inco employee who worked in Sudbury, developed drawpoint
obstruction clearance machines for block caving rigs, including blockhole jumbos in the late 1970s.
an offset herringbone drawpoint
layout to facilitate the use of electric loaders.
loading has been introduced to the mining areas of both shafts.
In the 1980s, mines begin to experiment with LHDs controlled by teleremote systems, removing the operator from the mucking process at the drawpoint
3] LHDs on drawpoint
loading and has a Sandvik Tamrock Toro 151D for development work, 10-15 m/d of development drive mucking.
That the mine has only been able to achieve that proportion despite a long involvement with automation projects is a reflection on the complexity involved, with the LHDs being controlled during loading by the operator in the control room, then traveling autonomously to the dump and back to the next scheduled drawpoint
The hydraulic radius needed to initiate caving, fragmentation, drawpoint
spacing, secondary blasting and the possibility of seismicity are geotechnical concerns that are being addressed.
Develop "measurables," such as best cycle times, drawpoint
and haul road condition, payload accuracy, etc.
A steel plate fitting over this raise is placed on whichever level the backfill is required to block the raise and collect the fill by, effectively, forming a backfill drawpoint
A sustained underground production rate of 70,000 mt/d can be achieved at an average drawpoint
extraction rate of 120 mt/d.
Once loaded, they are turned over to automatic tram and dump, taking their loads to the orepass, dumping it and returning to the drawpoint
In the Esmeralda project, they will be used as boxhole-boring (up-hole) machines for drawpoint
slot hole drilling and shaft development.