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PERMFILE102988
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PERMFILE102988
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Entry Properties
Last modified
8/24/2016 9:56:40 PM
Creation date
11/24/2007 9:31:36 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
OTHER DOCUMENTATION
Section_Exhibit Name
EXHIBIT 13 APPENDIX E
Media Type
D
Archive
Yes
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<br />o(the spoilpile exhibits better draining characteristics which <br />improves spoilpile stability. <br />5. Easier Scheduling of Operations -The contcntion- <br />al s}•stem of operation resulted in an imbalance oC all the <br />mining operations. The linear advance of stripping the <br />overburden was far faster :han the advance when stripping <br />the midburdcn. <br />\Vhen the conventional system teas being used it was nec- <br />essary to "coal" the No. ~ scam as rapidly as possible in <br />order to a!loty all at•ailablc drills to drill du midburdcn. <br />This ensured chat midburden blasting operations did nut <br />interfere with the dragline operations. The new system re- <br />sults in a balanced uperation which eliminates thnc scho- <br />duling dillicul[ics. <br />6. Better Dragline Digging Conditions - Tltc latcr:tl <br />movcmem of the midburdcn and overburden resulu in the <br />dragline dicging proponionatel}• Icss o(thc midburdcn, The <br />midburdcn exhibits more difficult digging condi[ions and is <br />far more abrasiyc. This has resulted in a considerable rc- <br />duction in dragline bucket costs. <br />7, Reduced Deadheading - \Vhcn using the ncty me- <br />thod the seams arc exposed by a single dragline pass. Tuo <br />passes were necessarc using the old cont'entional method. <br />Deadheading is therefore reduced by >Or;~. <br />APPENDIX: <br />Method of Blasting Before Presplitting Was <br />Introduced. <br />From the outset Rictspruit experienced problems in achicc- <br />ing good fragmcnlatlun of the sandstone. Initially. bulTcr <br />blasting tyas carried out using p host of dillcrcnt drill pat- <br />terns, potydcr factors and tiring scyucnccs. The lack of lat- <br />eral movement and column rise of explosives resulted in <br />large blocks o(sandstonc being pushed out of the surface of <br />the blasted area. These large blocks cause ditficult digging <br />conditioro and arc colloquially known as'L3ig Guulics'. <br />Onc of the major problems associated with bull'cr blasting. <br />is that the effects of chances in various parameters arc <br />not imntcdiatcly ccident. \1'ith bulTcr blastine, ground is <br />blasted several strips ahead of the dragline. The time ro- <br />yuircd to complete one strip is approximately four months. <br />BulTcr blasted ground thcrcfurc lies for seccral months bc- <br />700-m. lengths of overburcen blocks are snot complete <br />at R~etspruit. The large blocky material at left is usetl <br />as sp011 pile base <br />E19 <br />
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