2949775921

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TABLE 10

Verification of the mathematical model based on some random data consist of different thicknesses of ore body and heights of production błock

TABELA 10

Sprawdzenie modelu matematycznego na podstawie niektórych danych losowych obejmujących różną miąższość pokładów rud i wysokości bloku produkcji

Thickness [m]	Height [m]	Model	r^2	Cost from model [$/m^3l	Cost from design f$/m^3l	Adaptation ratio [%]
10	30	Cr,	0.87	3.726	3.71	100.43
25	70	CR1	0.87	3.733	3.74	99.81
20	80	Cr2	0.13	3.798	3.84	98.91
35	60	Cr2	0.13	3.760	3.82	98.43
40	40	^CR3	0.82	3.839	3.84	99.97
35	50	Cr3	0.82	4.146	4.29	96.64
10	40	Cp	0.88	2.495	2.49	100.20
40	40	CP	0.88	2.358	2.36	99.94

effectiveness. Finalły main results respecting economical comparison of drilling systems of sublevel stoping are as follow:

In fuli rangę of an ore body thickness, using parallel drilling is morę economical and cost effectiveness. If applying parallel drilling would be impractical due to technical reasons, ring drilling could be second ideał choice. Ring drilling pattern consist of one production drift in each sublevel, is the most cost effective designation in an ore body up to 30 m thickness. In case of an ore body with thickness over 30 m apply ring drilling pattern include two production drifts in each sublevel is the best designation. With the purpose of apply parallel drilling; generally dissimilar production costs are decreased about 45 percent against execute of ring drilling.

The developed mathematical model identifies dissimilar production cost of each drilling altematives. Therefore on the basis of thickness of ore body and height of production błock economical calculation for feasibility study would be viable step.

REFERENCES

[1]    Contador N.V.,Glavic M.F.,2001 - Underground Mining Methods, Engineering fundamentals and International casestudies. pp. 266 (SME, Colorado).

[2]    Gertch R.E.,Bullock R.L., 1998 -Techniques in Underground Mining, pp. 82-83 (SME, USA).

[3]    Haycocks C., Aelick R.C., 1992 - Mining Engineering Fłandbook. pp. 1720-1721 (SME, New York).

[4]    J i me no C.L., 1995 - Drilling and blasting of rocks. pp. 245 (Balkema, Netherlands).

[5]    Mann C.D., 1998 - Techniques in Underground Mining, pp. 229 (SME, USA).

[6]    PughG.M., Rsmussen D.G., 1982 - Underground Mining Methods Handbook. pp. 469-474 (SME, New York).