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Deep drilling design in the pit
1. Design basis and purpose.
The deep prospecting design is based on the characteristics of the known ore body extending to the depth of the ore body. Objective to expand the known results, find the blind orebody, obtain the base reserves, and provide the design basis for the deep exploration of the mine.
2. Deep prospecting and prospecting work.
The main layout of the design on the middle plane is the design of the perforated tunnel, borehole orientation and inclination design according to the shape and shape of the ore body. Therefore, it is arranged to control the ore body with a fan-shaped hole in each perforated tunnel. The main ore - bearing layer (belt) shall prevail.
3. Technical requirements for drilling holes.
(1) the total hole core adoption rate must be > 65%, and the rate of the surrounding rock (3-5 meters) of the upper floor of the ore layer and the mining layer must be 80%.
(2) the deep drilling hole depth > 300 m designed by drilling azimuth, and borehole tilt, azimuth within 0-300 m allowed no more than design bearing 2 degrees, borehole inclination allowed to drift within 2 degrees, see mine drilling center allows migration prospecting line from a quarter.
R (4) drilling azimuth Angle determination of inclined hole, dip azimuth every 50 meters, 100 meters straight hole survey once, instrument ZJL - 42 compass, deep in the same hole position, two instruments azimuth difference should not exceed 4 degrees, Angle difference should not exceed 2 degrees. Take the mean, exceed the error, and remeasure until it meets the specified requirements.
(5) hole depth verification, the hole depth correction shall be made for every 100 meters or the location of the mine, and the error size shall be carried out by 1/1000 standard, and the overpass shall be corrected, and the unsurpassed shall not be corrected.
(6) strict implementation of core drilling procedures.
(7) make the simple hydrogeologic work record timely, record the leakage, the water inflow position, and the location of the cave in the drilling process.
4. Safety measures for drilling in the pit.
(1) the drill chamber specification is 2 x 2 m (width and height) for the perforation tunnel used for deep drilling. Along the layer, the wear of arteries and veins must spray anchor bracing, wear vein tunnel slope Angle is 3 ‰, and drainage facilities, prospecting roadway > 200 m in vein, must ensure that feng shui electric facilities, when designing the prospecting trench, consider the design branch ventilation shaft at the same time, to ensure that the ventilation flow.
Drilling tunnels, (2) the construction security check in time, found that the tunnel collapse help falling, roof caving, serious and ventilated not free, hypoxia, her breath, must immediately stop the construction, timely withdrawal of personnel, prevent accidents.
(3) the drilling is determined on the surface, and the possibility of technical construction must be taken into consideration, and the hole level is required to be flat (avoid the steep cliff, reservoir and the area prone to mountain flood falls and debris flow).
The deep prospecting design is based on the characteristics of the known ore body extending to the depth of the ore body. Objective to expand the known results, find the blind orebody, obtain the base reserves, and provide the design basis for the deep exploration of the mine.
2. Deep prospecting and prospecting work.
The main layout of the design on the middle plane is the design of the perforated tunnel, borehole orientation and inclination design according to the shape and shape of the ore body. Therefore, it is arranged to control the ore body with a fan-shaped hole in each perforated tunnel. The main ore - bearing layer (belt) shall prevail.
3. Technical requirements for drilling holes.
(1) the total hole core adoption rate must be > 65%, and the rate of the surrounding rock (3-5 meters) of the upper floor of the ore layer and the mining layer must be 80%.
(2) the deep drilling hole depth > 300 m designed by drilling azimuth, and borehole tilt, azimuth within 0-300 m allowed no more than design bearing 2 degrees, borehole inclination allowed to drift within 2 degrees, see mine drilling center allows migration prospecting line from a quarter.
R (4) drilling azimuth Angle determination of inclined hole, dip azimuth every 50 meters, 100 meters straight hole survey once, instrument ZJL - 42 compass, deep in the same hole position, two instruments azimuth difference should not exceed 4 degrees, Angle difference should not exceed 2 degrees. Take the mean, exceed the error, and remeasure until it meets the specified requirements.
(5) hole depth verification, the hole depth correction shall be made for every 100 meters or the location of the mine, and the error size shall be carried out by 1/1000 standard, and the overpass shall be corrected, and the unsurpassed shall not be corrected.
(6) strict implementation of core drilling procedures.
(7) make the simple hydrogeologic work record timely, record the leakage, the water inflow position, and the location of the cave in the drilling process.
4. Safety measures for drilling in the pit.
(1) the drill chamber specification is 2 x 2 m (width and height) for the perforation tunnel used for deep drilling. Along the layer, the wear of arteries and veins must spray anchor bracing, wear vein tunnel slope Angle is 3 ‰, and drainage facilities, prospecting roadway > 200 m in vein, must ensure that feng shui electric facilities, when designing the prospecting trench, consider the design branch ventilation shaft at the same time, to ensure that the ventilation flow.
Drilling tunnels, (2) the construction security check in time, found that the tunnel collapse help falling, roof caving, serious and ventilated not free, hypoxia, her breath, must immediately stop the construction, timely withdrawal of personnel, prevent accidents.
(3) the drilling is determined on the surface, and the possibility of technical construction must be taken into consideration, and the hole level is required to be flat (avoid the steep cliff, reservoir and the area prone to mountain flood falls and debris flow).
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