In simple terms: A possible workout in later portfolio lists, but no reliably documented corporate action ties it to Buffett's workout book. Stanrock Uranium is included in the Buffett Partnership special-situations record with an evidence grade of D - candidate only; evidence is too weak for a confirmed case.
What Buffett saw
Some retrospective lists place Stanrock Uranium in the 1962 Buffett Partnership portfolio and call it a work-out. The supplied letters do not name the company or set out a corresponding corporate action.
This is deliberately included because the boundary matters. A later portfolio list may be a useful lead for an archivist, but it does not tell a reader what event Buffett expected, what he paid, what he could receive or when the position ended.
How the situation was meant to work
There is no defensible deal sheet to build from the available record. Without announced terms, an entry price and an exit, there is no spread to annualise and no downside case to calculate.
Without a disclosed entry price, transaction terms, exit date or even confirmed category assignment, the usual special-situations arithmetic cannot be performed honestly.
The timeline, capital and risk
Capital disclosed: Some secondary portfolio reconstructions report about 5% of BPL; no primary confirmation in the supplied letters.
Time frame: Reported 1962.
The primary risk here is a research error: turning a repeated internet attribution into a historical fact. The appropriate conclusion is not that the case failed; it is that the record does not establish the case.
What happened
Outcome: Not established from the letters.
What the return means - and the lasting lesson
Return record: Unknown.
An exhaustive research library must make room for 'not established'. That label is more useful than a confident story built from a fragile secondary attribution.
This guide is educational information, not a recommendation, investment advice or a substitute for reading the underlying disclosure.