Southstone Minerals Limited
Southstone Minerals Limited (Victoria, BC-headquartered, founded 2007) holds a 43% equity interest in African Star Minerals (Pty) Ltd ('ASM'), which owns 100% of the mining right for the producing Oena Diamond Mine, an 8,800-hectare New Order Mining Lease along a 15km stretch of the lower Orange River, Northern Cape Province, South Africa (renewed to 15 March 2027). ASM contracts the physical mining out (currently to Rietput Delwery (Pty) Ltd) under a contract mining and diamond recovery agreement entitling ASM to only 20% of gross diamond sales revenue (net of tender-house commissions and sale-related expenses; tiered 80:20/85:15 by tender size effective 1 Jul 2025) -- so Southstone's own disclosed effective economic interest in Oena's diamond-sales revenue is 8.6% (0.43 x 0.20), not a majority stake. Southstone/ASM manages diamond sales, mining consultation with the contractor, licence-compliance reporting and site security, and staffs ASM's CEO and the Oena site manager, but does not itself perform the extraction. Diamond production began 7 Nov 2023; the operation runs 24 hours/day, 6 days/week, targeting 3,000-3,500 tonnes/day of run-of-mine gravel processed through two 16-foot pan plants, with average recovered diamond values reported in excess of US$1,600/carat and real, ongoing quarterly sales (e.g. Q2 FY2026 gross diamond sales of US$3,713,181). In February 2025 the company signed a binding term sheet to acquire Afrium Energy Pte. Ltd. (holder of three uranium Prospecting Licenses in Botswana's Lekobolo Project) for 20,000,000 Southstone shares plus a 2.5% NSR to Afrium's shareholders; this diversification deal was mutually terminated effective 6 Jul 2026 (mutual release of claims, no shares issued, no royalty granted), so no uranium commodity or asset is recorded here. No NI 43-101/JORC resource/reserve figure is carried for Oena's alluvial diamond gravels -- production is reported in carats and $/carat, not compliant ounces.
Notable vs. Peers
- Financials score of 8.3/10 is stronger than the peer average of 5.6/10.
- Trading within 0% of its 52-week low — weak recent price momentum.
Lifecycle Milestones
Construction Milestones
5 of 5 reached- Reached — date not disclosed · The original Oena mining licence was issued to private South African diamond company Kuboes Diamante in 1992 -- 21 years before African Star Minerals (ASM) acquired Kuboes Diamante 100% in 2013, and 22 years before Tango Gold Mines (Southstone's predecessor) acquired its 51% ASM stake in October 2014. That licence was converted to the current New Order Mining Lease in 2009 under South Africa's Mineral and Petroleum Resources Development Act (MPRDA), again years before any Tango/Southstone involvement, and has since been administratively renewed (a renewal, not a fresh grant) for a further term to 15 March 2027. No permit was newly granted to ASM or to Tango/Southstone -- both inherited the already-converted 2009 lease. Same reused-pre-existing-permit shape as HL/San Sebastian and DRD/FWGR (Task #646 batch 1). Exact 2009 conversion day not found in available sourcing. · Source
- Oct 2014 · Tango Gold Mines Incorporated's own Oct 1, 2014 press release (Marketwired, 11:08 ET, verified directly against the original release text) announces a definitive arm's-length agreement to acquire a 51% interest in African Star Minerals for 49,000,000 shares at a deemed price of $0.05/share -- the board's formal capital-commitment decision to take control of and redevelop Oena. Framed honestly: Oena was explicitly "currently on care and maintenance" at the time of this release (a dormant, past-producing asset, not an active build), and physical mining did not actually restart for another ~9 years (see CONSTRUCTION_START/FIRST_PRODUCTION below) -- this row records the corporate FID-equivalent to acquire and commit to the asset, not a claim that construction began immediately. No underlying royalties on Oena per this same release. · Source
- Reached — date not disclosed · Southstone's own website (project page "Oena Diamond Mine - November 2023", verified directly): "Diamond mining operations commenced at the Oena Diamond Mine in July 2023..." -- exact day within July not given. Note for the record: this July 2023 restart (Sandberg Section mining/processing mobilization) was not the first attempted restart -- earlier mobilizations in Oct 2017 (Bluedust 7 contractor appointed, work contingent on due diligence) and June 2022 (Oryx Mining, "Commencement of Contract Mining Operations at Oena Diamond Mine") are also on the public record but did not lead to sustained production at the time. July 2023 is recorded here as the one that actually led to the Nov 2023 first production documented below. · Source
- Nov 2023 · Southstone's own website (project page "Oena Diamond Mine - November 2023", verified directly against the live page text): "...first diamond production occurred on the 7 November 2023 following certification of the BVX [Bourevestnik X-Ray] Recovery Unit." Primary-source, day-level precision. · Source
- Reached — date not disclosed · Genuinely reached, but a genuinely ambiguous ownership/dating structure prevents a single clean date: Southstone holds a 43% interest in African Star Minerals (ASM), which in turn owns/operates the Oena Diamond Mine (Northern Cape, South Africa) via a rotating slate of appointed third-party mining contractors (Oryx Mining, Rietput Delwery, and others) -- a minority, indirect interest with contractor-run field operations, not a typical single-operator mine. Company materials give conflicting timeframes for when production genuinely began (a 'Commencement of Diamond Production' release dated 2023-11-07, alongside separate references to production activity dating back to at least November 2018). Given the indirect minority stake, the contractor-mining structure, and the unreconciled 2018-vs-2023 dating, left null rather than force a single date onto a genuinely ambiguous structure. This row was missing entirely prior to 2026-08-21 -- a genuine data gap, not a stage error; Miner.stage was already correctly PRODUCTION. [Task #522 re-verification, 2026-08-21] CONFIRMED CORRECT -- stronger citation found. Southstone's Q3 fiscal 2026 results (quarter ended 31 May 2026, https://southstoneminerals.com/southstone-reports-q3-2026-diamond-sales-results-and-appointment-of-independent-director-and-chief-financial-officer/) report a new record US$4,733,181 in gross diamond sales (2,132.33 carats, avg US$2,220/carat), up from the Q2 FY26 figure (US$3,713,181) already on file -- real, growing, publicly-disclosed revenue sustained across multiple consecutive quarters since production began. The 2018-vs-2023 dating ambiguity and the 43%-indirect-minority-stake/contractor-operated structure remain genuinely unresolved (as this row already honestly documents), but neither bears on whether real, current sales are occurring -- they clearly are. Task #521's genuine flag on this row is resolved: real sales confirmed, no stage or milestone change needed. · Source
Milestones are recorded only from a company's own dated disclosure. A milestone with no date shown is one we can confirm was reached but for which no date was disclosed — we don't estimate one. "Not yet reached" means exactly that, not that a date is missing. An "Expected" line likewise only ever reflects the company's own guidance (e.g. a study or permit decision targeted for a stated quarter) — most not-yet-reached milestones have none, and that absence means no such guidance has been disclosed, not that one is overdue.
A relative ranking of how closely this company matches the profile of juniors that have actually been acquired — not a probability, and not a reason to buy. Acquisitions are rare: only a few dozen significant deals happen a year across a universe of thousands of juniors, so even a high score here describes a long shot. The strongest signal the underlying research identifies — whether a major already holds a JV, earn-in, or 5–19.9% strategic stake — isn't tracked yet and is absent from this score.
Your Rankings
Management Team
Canadian geologist (P.Geo.) with over 30 years' international mineral exploration and development experience, including the discovery of the Wolverine gold-massive sulfide deposit in northern Canada and the Mungana gold deposit in North Queensland. President and Chief Executive Officer of Kalo Gold Corp. Concurrently Director, Executive Chairman and Interim CEO of Southstone Minerals Limited. Previously President, CEO and Director of TSX-listed StrataGold Corporation (acquired by Victoria Gold Corp. in Jun 2009) and CEO/Director of Nyota Minerals Limited (AIM/ASX) to 2011.
Chief Financial Officer of Southstone Minerals Limited, effective 25 May 2026. Vice President at Catapult Consulting Corporation (since 2019) and Group Financial Controller for Rock Tech Lithium, providing CFO services to public and private companies across mining, technology, construction and other sectors -- building financial reporting processes, internal controls and budgeting/forecasting models. Chartered Professional Accountant (CPA, CA) with a Bachelor of Commerce from the University of Alberta.
Insiders, Investors & Smart Money
Notable shareholders and insiders whose involvement is worth knowing about, plus what we're seeing from institutional/large-investor activity.
No producer, strategic investor, or resource-specialist fund holds a disclosed stake, and no insider trading activity has been filed in the last six months.
No notable insiders tracked for this miner yet.
Reports, Presentations & Documents
Pending Botswana uranium acquisition (Afrium Energy / Lekobolo Project) noted in description -- not recorded as a commodity or asset here because final closing was not confirmed as of this research pass (last found status: TSXV conditional approval + extension to 12 Sep 2025).