About Us

Company Profile

Wonderstone Ltd is a mining company that is 100% owned by Assore Ltd and has been mining a uniquely pure  pyrophyllite deposit since 1937. Wonderstone mine is situated approximately 300 kilometers west of Johannesburg, close to the small town of Ottosdal.

Wonderstone as a company does not manufacture or sell synthetic diamonds (lab grown diamonds), we do however manufacture various components made from our unique high density Pyrophyllite. These components are mostly used as capsules/envelopes and gaskets in High Pressure High Temperature (HPHT) diamond synthesis processes. We have the capability to produce these components ether through powder pressing our pyrophyllite or by directly machining from our natural pyrophyllite stone. The choice between powder pressed or natural pyrophyllite components would depend on the specifics of the application, as each form offers slightly different benefits with both offering an optimal balance between flow (gasket formation) and pressure transfer.

Wonderstone Pyrophyllite, being an Alumina Silicate is also used extensively in the technical ceramics industry. Properties such as excellent thermal shock resistance, low thermal expansion, excellent electrical insulator, very good thermal insulator, etc make our pyrophyllite highly suitable for various technical ceramics applications.

As an entirely independent company since its inception in1937, Wonderstone Ltd has taken pride in conducting its business with strong ethical values and respect for confidentiality. Wonderstone Ltd is an innovative company with numerous exciting Research & Development projects currently underway. With new applications and advancements for pyrophyllite being regularly discovered, we are happy to report that, given our current rate of mining and market demand, and based on the in-situ resource, Wonderstone still has a remaining life of mine in excess of 100 years.

Community Projects

Wonderstone Ltd has over the years and is still currently involved, in numerous community upliftment projects. For example, Wonderstone Ltd. along with Assore Ltd entities such as Dwarsrivier and Boleng Trust, have built the Natanja Primary School which serves learners in the Ottosdal community, where Wonderstone mine is situated. They also fund the Tertiary Education Preparatory (TEP) Programme. This programme aims to prepare students from rural areas, academically for university and other tertiary education programmes.


TUV Rheinland ISO 9001 2015
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TUV Rheinland ISO 14001 2015
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