mini-drilling rig on crawler track

area backlog borer boring building built construction crawler cutover cuttingdown deforestation device dredging drill drilling drillingrig drillpipes engine enterprise exploitation exploratory exploring felling forest ground hole jumbo land large largescale logged machine major minidrilling mounting opening operation patch pioneering planchet plot project prospecting research rig rock rockdrill rod sawn setup site slash small soil stem string surveying texture trees tubulars vehiclebased wagon work