A mine filling method in Germany

The Ramelsberg mine has two ore bodies (old ore bodies and new ore bodies). The new ore body is 50-100 m wide, 320 m long and 40° dip.

At present, the main stage of mining new ore bodies is 10-12 stages. The stage is 40m high and adopts two-step recovery. The stope is arranged vertically, and the mine room and the column are 10m wide. Most of the mining houses have been finished with the upward horizontal layered cementation filling method, and the intermediate column is recovered by the downward wind filling method (Fig. 1). The thickness of the ore body is up to 100m. Therefore, the ore-oriented pillars will be classified into the upper mining yard and the lower mining yard.

Figure 1 Lammersberg mine under the filling method

A-segment plan; b-stratified recovery plan; 1, 2, 3 - stage level; 4 - ramp;

5—segmented roadway; 6—already mining room; 7—already mining column; 8—stratified approach; 9—going strip mine pillar;

10—Layered contact roads; 11—Wind filling station; 12—Maintenance room

The inter-column mining includes: excavating a 10° slope in the lower plate, thereby digging the sub-district roadway every 9m, and digging the roadway and the vein outside the sub-column every 10m (ie, the spacing between the columns) Sliding well.

Each segment is divided into three layers from top to bottom. Use three strips with a width of 3 to 3.5 m to stratify. Rock drilling with a single-arm drilling rig with a hole depth of 2.1 to 3.0 m and a hole diameter of 40 mm. The 1.53m ³ scraper is used for the excavation. Route after recovery, with a metal net and logs BEDDING KZS-150 from the center of the wind wind the conveyor transport station filled with coarse aggregate particle diameter <70mm, and mixed in the filling tube ø175mm 6% of cement and 100kg /m ³ of water is filled. The filling capacity is up to 60m ³ /h. The spray distance is up to 8m under the wind pressure of 0.5~0.6MPa, which can ensure dense filling. Due to the use of wind-knotted filling, the productivity of the stope has been increased from the initial 8 tons/person (with non-cemented filling) to 23 tons/person.