| (19) |
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(11) |
EP 0 184 460 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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29.04.1987 Bulletin 1987/18 |
| (43) |
Date of publication A2: |
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11.06.1986 Bulletin 1986/24 |
| (22) |
Date of filing: 05.12.1985 |
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| (84) |
Designated Contracting States: |
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DE FR GB SE |
| (30) |
Priority: |
05.12.1984 AU 842084
|
| (71) |
Applicant: SAINSBURY, Garrett Michael |
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() |
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| (72) |
Inventor: |
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- SAINSBURY, Garrett Michael
()
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| |
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| (54) |
Improved shaft sinking method |
(57) A method of sinking shafts comprising excavating a series of lifts wherein each lift
is excavated by drilling a pattern of blast holes for the full depth of the lift including
boring a large diameter hole and creating a chamber at the lower end of the large
diameter hole, blasting the walls of the chamber to deposit rock material into the
chamber, extracting at least a portion of the rock material created by the blast and
repeating the blasting and extraction step throughout the length of the lift wherein
on the volume of said lift being blasted the remaining rock broken material is extracted.