Steenkampskraal Monazite Mine (SMM)

A high-grade monazite vein deposit whose planned product is a concentrate grading more than 50% total rare earth oxides, from an in-situ resource grade of about 14.4%. Because monazite hosts thorium, the deposit carries a radioactivity question: the operator holds National Nuclear Regulator registration and has publicly discussed thorium as a potential nuclear fuel and radium-228 recovery for medical isotopes.

At a glance

Founded: 1952 — Mined for monazite and thorium by Anglo American through a subsidiary from 1952 to 1963, then inactive. The present corporate lineage begins with Rare Earth Extraction Co. Ltd, which acquired prospecting rights in 1989.
Headquarters: Western Cape, South Africa, approximately 350 km north of Cape Town
Ownership: Private and unlisted. The operating company is Steenkampskraal Monazite Mine (Pty) Ltd, a subsidiary of Steenkampskraal Holdings Ltd. A January 2018 information memorandum gives Steenkampskraal Holdings 74% and a workers' trust 26%; Bora Mining Investments has since taken an undisclosed stake. Earlier listed associations were Rareco on the JSE Venture Capital Board until 2007 and Great Western Minerals Group from 2011 until a 2015 disposal during insolvency proceedings. Possibly stale: the only precise shareholding in a primary document dates from January 2018, and the Bora Mining Investments stake has never been quantified publicly. Further research needed.
Stage: Developing. A historic mine being restarted under new control, with restart targeted for 2026.
Listing: Private.
Revenue: Not publicly disclosed. This company does not publish revenue and no named third party has published an estimate of it.
Pre-revenue. The mine has not entered commercial production and no revenue figure appears in any public source.

Capacity

Each date below links to the document the figure came from. A capacity figure with no source is not on this page.

What	Figure	Status	As of
Ore and monazite concentrate under Anglo American	approximately 25,000 t/yr of ore yielding approximately 6,000 t/yr of monazite concentrate	Historical	1952–1963
Commercial production of any saleable product	none. The mine left care and maintenance in 2024 and first monazite concentrate was produced at pilot scale; the Phase 1 plant was still under construction in September 2026.	Under construction	Sep 2026
Monazite concentrate — the company's own published base case	approximately 5,400 t/yr	Announced	2025
Contained rare earth oxide — the company's own published base case	approximately 2,700 t/yr REO	Announced	2025
Mineral resource, measured and indicated, October 2013 estimate, prepared under previous ownership	605,000 t at 14.4% REO plus Y2O3, containing 86,900 t REO	Historical	2014

Narrative

Steenkampskraal is a high-grade monazite deposit in South Africa's Western Cape, mined by an Anglo American subsidiary from 1952 to 1963 for monazite and thorium. The asset passed from Rare Earth Extraction Co. to Great Western Minerals Group in 2011, was sold in 2015 during Great Western's insolvency proceedings, and the holding company was renamed Steenkampskraal Holdings in 2016. The operating subsidiary left care and maintenance in 2024. The Industrial Development Corporation released the first of four funding tranches in September 2025 for a Phase 1 concentration plant, which broke ground in April 2026 with commissioning scheduled for August 2026. As of September 2026 the mine remains pre-production and pre-revenue.

Where public sources disagree

Restart dates have been announced repeatedly and have moved. First concentrate was targeted for December 2024, then Q3-Q4 2025, then before the end of 2026. None of these has been independently confirmed as met.
Offtake status is inconsistent. Trade press in May 2025 reported agreements secured for roughly a quarter of output; by April 2026 the same outlet described offtake discussions as merely well advanced. No counterparty has been named publicly.
The capacity figures above are the company's own published base case. Larger numbers were reported at the April 2026 groundbreaking — 6,600 t/yr of concentrate ramping to 13,400 t/yr — and are not reflected here, because it is not public whether they are a revision of the base case, a different product basis, or a later phase. The two are not reconcilable from public sources: 13,400 t/yr of concentrate above 50% TREO would imply contained oxide well above the 2,700 t/yr base case.
Capacity figures differ by a factor of more than two between company documents: a base case of approximately 5,400 t/yr concentrate and 2,700 t/yr REO on the company's own project-economics page, against 6,600 rising to 13,400 t/yr of concentrate reported at the April 2026 groundbreaking. It is not public whether these are successive revisions or different products.
Ownership percentages are only documented as of January 2018. The Bora Mining Investments stake has never been quantified publicly.
The resource and reserve estimates date from 2013 and 2014 and were prepared under previous ownership. No restatement under the current owner was located.

Fact checks from the digest

Claims made about this company that the weekly digest has put against this atlas, newest first. The verdict and the working are here in full; the issue each came from is for subscribers.

narrower than claimed · Digest issue 008 · 12 October 2026

A plant is open, offtake is in place, and nobody has said how much of anything

The 15 metric ton an hour figure being carried as Steenkampskraal’s capacity is narrower than that on two counts.
Whose it is. It is the EPC contractor’s figure, on its own project page, repeated by International Mining on 8 October 2026. The company’s release of 6 October 2026 publishes no capacity figure at all.
What it measures. It is an hourly ore throughput for the Phase 1 concentrator. With no operating hours and no concentrate yield published, it cannot be converted to metric tons a year of concentrate, and still less to rare earth oxide.

Sources

Information memorandum, January 2018 — Steenkampskraal Holdings Ltd (2018-01)
SMM breaks ground on Western Cape monazite plant — Mining Weekly (2026-04-22)
IDC funds Steenkampskraal rare earths project — ESI-Africa (2025-09-22)
Steenkampskraal and Mintek reach milestone — IOL / Business Report (2026-06-24)
Local processing gains momentum — Cape Business News (2026-09-11)
Six-phase rare earths production plan — Mining Weekly (2025-10-24)

How this page is sourced

Everything here comes from public sources — company filings, annual reports, exchange announcements, government releases and trade press. Every figure is linked to the document it came from and carries the date that document was published, because a capacity number without a date is not a fact, it is a rumor with a decimal point.

What is deliberately absent: material nonpublic information. I have spent more than two decades in this industry and a good deal of what I know about these companies I learned under NDA. Those obligations do not expire and they do not bend for a website. Nothing I have been told in confidence appears here in any form, and nothing on this page — or missing from it — should be read as a signal about what I know privately. I hold NDAs absolutely. It is the reason clients tell me things.

Judgment is the other thing left out on purpose. This page reports what has been published and who published it. Whether a target is credible, whether a ramp will hold, whether a capacity figure survives contact with the plant behind it — that is the work I do for clients, and it does not belong in a free reference page.

Where public sources disagree, I say so rather than picking a winner. Where a figure has not been published, the field says so rather than carrying an estimate. An empty field is information too.

Public filings tell you what a company has said. Whether it holds up is a different question, and the one I get hired to answer.

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