Tormin Mineral Sands – Resource



The geomorphology of the J shaped coast line has resulted in a concentration of heavy minerals along the current beach to form enriched zones of ilmenite, garnet, rutile and zircon. This material has been deposited unconformably over the basement schists. The beach is up to 6 meters thick in places and consists of a basal conglomerate pebble unit which fills in the unconformities in the bedrock and is overlain by marine sands that contain the heavy mineral sands. At the basal contact the conglomerate pebble material contains the diamondiferous material which THG have been mining for many years.

Drilling by THG between 1989 and 1991 and the bulk sampling in 2004 and 2011 indicated substantial variation in deposit mineralogy across the beach. The table below shows the average composition of the bulk samples taken at the low, mid and high water marks along the beach

Mineral Resource

The deposits are active beach deposits and are located between the low water mark and the cliff base above the high water mark. The heavy minerals present in order of abundance are garnet, ilmenite, zircon and rutile. During seasonal storm events significant volumes of sand are redistributed over the length of the beach, changing the local tonnage and grade.

The beach has been and is still mined for diamonds with THG as the current operator. In 1992 THG completed a resource assessment of the Tormin heavy mineral sand deposits as part of an overall assessment of the economics of mining the diamondiferous gravels at the base of the beach deposit.

THG completed several phases of drilling and bulk sampling. This work has been reviewed by MRC and found to have been undertaken to standards that are commensurate with those currently being used. Exploration consisted of:

  • Hand held auger drilling in 1989;
  • Reverse Circulation (RC) drilling in 1990 and 1991; and
  • 1 metre diameter bulk sample drilling in 1991. 


Ore Mt


Ilmenite (% in HM)

Zircon (% in HM)

Rutile (%in HM)

Garnet (%in HM)