The Assay Ledger of the Cresthallow Adit

≈ 4 min

Cresthallow Silver Mine submits monthly ore assay reports to the Nevada Territorial Mining Commission, which uses the figures to calculate the royalty owed to the landholding trust. Assay Officer Clement Dray has filed the report for July 1879, itemising the silver yield from each active adit and stope. A routine cross-check of the report against independent records has raised questions about one of the six yield entries. You are asked to identify which line of the filed report is inconsistent with the supporting record that contradicts it.

The scene

Cresthallow Silver Mine assay office, Pioche, Nevada, 1879

Source documents

Independent Assay Survey — Cresthallow Mine, July 1879
Cresthallow Bullion Dispatch Manifest — July 1879
Reagent Supply Invoice — Cresthallow Mine, July 1879
Nevada Territorial Mining Commission — Adit Registration Register, 1876–1880

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This case first aired on July 24, 2026. A fresh audit runs every morning — same rules, five minutes, one solution.

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