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A preliminary qualitative evaluation of a hydraulic splitting cylinder for breaking rock in deep-level mining
De Graaf, Wolter Willem
;
Spiteri, William
(
Southern African Institute of Mining and Metallurgy
,
2018-08
)
Factors and challenges affecting coal recovery by opencast pillar mining in the Witbank coalfield
Ngwenyama, Philani Larrance
;
De Graaf, Wolter Willem
;
Preis, Eugene Pieter
(
Southern African Institute of Mining and Metallurgy
,
2017-03
)
Risks and challenges affecting opencast pillar mining in previously mined underground bord and pillar workings
Ngwenyama, Philani Larrance
;
De Graaf, Wolter Willem
(
Southern African Institute of Mining and Metallurgy
,
2021-12
)
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Author
De Graaf, Wolter Willem (3)
Ngwenyama, Philani Larrance (2)
Preis, Eugene Pieter (1)
Spiteri, William (1)
Subject
Bord and pillar collapse (1)
Bord collapse (1)
Bord voids (1)
Coal losses (1)
Coal recovery (1)
Construction applications (1)
Cylinders (shapes) (1)
DARDA® hydraulic splitter (1)
Deep-level mining (1)
Drilling equipment (1)
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Date Issued
2017 (1)
2018 (1)
2021 (1)
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