I have checked thos on many maps old and newer NT Govt mapping systems such as https://www.ntlis.nt.gov.au/imfPublic/imf.jsp?site=nt_atlas&qhlt=true&qsel=true&qbuf=0.01&qry=PLACE_ID%3D3114&qlyr=9

Mt Mabel is published as 164 metres in height on the 250,000:1 Topo Map and many earlier maps but is often stated as 151 meters or less on Mapping systems which have elevation estimates based on contours. The contours at location marked as Mt Mabel would indicate approximately 150 metres BUT the conical peak to the North North West has a 160 metre contour with potentially a 163 metre peak.