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    Crusher Capacity Studies

    Independent studies of crusher output conducted by two separate universities.
    1. University of Mines and Technology
      Mining Engineering Department
      Tarkwa, Ghana

    2. Prince Of Songkla University
      Department Of Mining And Materials Engineering
      Hat Yai, Thailand


    University of Mines and Technology
    Mining Engineering Department
    Tarkwa, Ghana
    • VARI-STEM STEMMING PLUGS gave better fragmentation in hard rock zones.
    • The average crusher output with conventional stemming was 410.45t/hr, while stemming with VARI-STEM® improved to 466.09 t/hr. The VARI-STEM® increased primary crusher output by 13.56%.

    MONTH CRUSHER THROUGHPUT
    (ton/hr.)    		 INCREASE CRUSHER THROUGHPUT
    (ton/hr.)>    		 COMPARATIVE PERCENTAGE (%) INCREASE
    (crusher throughput)
    CONVENTIONAL STEMMING VARI-STEM ®
    STEMMING PLUG
    1 424 484 60 14.2
    2 423 465 42 9.9
    3 414 452 38 9.2
    4 420 462 42 10.0
    5 417 459 42 10.1
    6 390 441 51 13.1
    7 363 428 65 17.9
    8 530 573 43 8.1
    10 401 459 58 14.5
    11 307 428 121 39.41
    12 426 476 50 11.74
    Average 410.45 466.09 55.64 13.56%




    Prince Of Songkla University
    Department Of Mining And Materials Engineering
    Hat Yai, Thailand
    • Increase in crusher capacity 14-19%
    • Cycle time of back hoe Cat 330d reduced 6.17%

    NO VARI-STEM® - CONVENTIONAL BLASTING
    DAY CRUSHER 1 CRUSHER 3
    HOURS TONS HOURS TONS
    1 1.00 234.23 6.00 1,684.37
    2     7.00 2,031.12
    3     4.75 1,375.51
    4 3.75 1,092.09 2.00 582.46
    5 1.25 338.06 4.75 1,242.82
    6 2.50 806.38 1.00 274.27
    7 2.50 783.76 1.50 420.98
    8 3.00 874.89 3.75 994.25
    9 5.50 1,647.53    
    10 1.50 445.46 2.50 674.44
    11 4.00 1,324.95    
    12 2.50 742.74 3.75 946.56
    13 2.00 579.69 2.25 602.68
    14 5.25 1,384.37    
    15 6.75 1,924.17    
    Average 293.45 ton/hr. 275.91 ton/hr..
    284.926 ton/hr.



    CAPACITY OF PRIMARY CRUSHER ROCK
    FROM VARI-STEM® STEMMING PLUG BLASTING
    DAY CRUSHER 1 CRUSHER 3
    HOURS TONS HOURS TONS
    1 1.75 525.61 4.50 1,560
    2 3.00 956.42 2.50 761
    3 3.75 1,286.02    
    4 1.75 563.46 3.50 1,009
    5 4.75 1,535.14 1.75 578
    6 2.50 793.06 3.00 920
    7 2.50 874.17 2.25 755
    8 2.25 773.66 2.50 834
    9 1.50 512.66 3.50 1,182
    10 2.00 687.15 1.50 503
    11 2.25 790.34 3.00 1,071
    12 4.25 1,481.99    
    Average 334.25 ton/hr. 327.85 ton/hr.
    331.165 ton/hr.