div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=hardgrove-hardgrove-grindability-index-hgi-work-index-hardgrove-grindabilityhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Hardgrove Hardgrove Grindability Index HGI Work Index miningengcmuacthwp-contentuploads201611490610579pdfHardgrove Hardgrove Grindability Index HGI Work Index loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentssitereader031viewer20220221165c7f574909d3f2c33f8c7c60html5thumbnails1jpg width=140 height=200 divdiv