{
  "title": "Nonferrous refining data for AI stream and sample records",
  "source_page": "https://fiund.com/industries/nonferrous-refining-sample-stream-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "The return loop is not the final lot",
    "context": "A toy flow diagram uses three record types and no chemical or operational information.",
    "records": [
      [
        "1",
        "Flow diagram",
        "Input I2 → intermediate J2; J2 can route to final F2 or return R2."
      ],
      [
        "2",
        "Sample ticket",
        "S8 collected from R2 before reentry."
      ],
      [
        "3",
        "Report index",
        "Report S8 labeled 'after J2'; final-lot field blank."
      ]
    ],
    "question": "Can S8 be filed under final lot F2?",
    "answer": "No. Record 2 locates the sample on return R2, which is a different branch from F2 in record 1. The loose label in record 3 is compatible with both branches and cannot establish final-lot identity. Use the return-stream scope.",
    "failureModes": [
      "Joining on the shared upstream stage",
      "Treating a return as verified final product"
    ],
    "fields": [
      [
        "stream_branch",
        "Disambiguates outputs of one stage"
      ],
      [
        "sample_location",
        "Pins where material was collected"
      ],
      [
        "final_lot_link",
        "Remains empty unless supported"
      ]
    ],
    "holdout": "Sample a merged branch and provide a documented split ratio only after collection; avoid applying future information to the earlier sample.",
    "boundary": "No refining process design, composition, production records or commercial grade claims."
  }
}