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shafts using a two phase process Similar to the horizontal drilling process loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220416085e35a84180f13500bd2a73f8html5thumbnails2jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=s3-raise-drilling-795-raise-drilling-is-a-method-for-excavating-vertical-orhtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: s3amazonawscomRAISE DRILLING 795 Raise drilling is a method for excavating vertical Or inclined mine shafts using a two phase process Similar to the horizontal drilling process loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220416085e35a84180f13500bd2a73f8html5thumbnails3jpg width=140 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Or inclined mine shafts using a two phase process Similar to the horizontal drilling process loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220416085e35a84180f13500bd2a73f8html5thumbnails5jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=s3-raise-drilling-795-raise-drilling-is-a-method-for-excavating-vertical-orhtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: s3amazonawscomRAISE DRILLING 795 Raise drilling is a method for excavating vertical Or inclined mine shafts using a two phase process Similar to the horizontal drilling process loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220416085e35a84180f13500bd2a73f8html5thumbnails6jpg 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