The Mothae Kimberlite pipe was discovered in 1961 by Basutoland Diamonds Ltd. The recovery of Kimberlite indicator minerals in stream gravel wash downstream from the pipe was traced back to the source in a similar manner to other discoveries at that time. No reports of this work are available but it is reported that local artisanal miners worked the property for a period before any evaluation program commenced.
Colonel Jack Scott conducted diamond prospecting in Basutoland in the 1950s and 1960s with some technical success. Mothae was examined and several pits were excavated. The Kimberlite material was processed through a portable, hand operated 4 foot rotary pan. The results were reported by Bleackley and Workman (1964) and Meaton (1966). At that time it appears that two separate Kimberlite pipes were recognised ("Moteanyane" in the north and "Motai" in the south). Diamond recoveries were modest and appeared to diminish dramatically in the underlying harder "blue ground" Kimberlite. Subsequently, Lonrho Ltd. carried out a more methodical evaluation that included excavating 12 pits of 6m diameter to 24m depth. A bi-lobate pipe of about 8.8 ha was mapped out at surface. The upper 180m of the pipe was delineated from pitting and drilling, and supplemented by ground magnetic surveying. No records of this work are available except the brief summary provided by Nixon in the book "Lesotho Kimberlites" published at the time of the First International Kimberlite Conference in 1973. These results cannot be relied upon and are not in accordance with National Instrument 43-101.
The information in this section which is of a scientific or technical nature has been derived in part from the technical report entitled "Mothae Kimberlite Project, Lesotho, Independent Technical Report" dated February 12, 2007 prepared by Dr. Norman Lock (BSc, PhD, CGeol FGS, MGSSA, PrSciNat) of MSA Geoservices (Pty) Ltd., who is a "qualified person" within the meaning of this term in National Instrument 43-101. A copy of the report is available on SEDAR at www.sedar.com.