What the Text Describes

The Book of Mormon does not merely mention metal plates in passing. Metal plates are the text's entire medium of existence, its framing device, its material substrate. The following plate sets are named:

1. Plates of brass — Laban's plates, obtained by Nephi in Jerusalem (~600 BC). Contain the Law of Moses, the prophecies of Isaiah and other prophets, and the genealogy of Lehi's family. These are the Nephite Torah, carried across the ocean and consulted throughout the narrative. Brass (a copper-zinc or copper-tin alloy) is the specified metal.
2. Large plates of Nephi — Nephi's secular/political record, continued by subsequent keepers. Made of "ore" (1 Nephi 19:1).
3. Small plates of Nephi — Nephi's sacred/spiritual record, covering 1 Nephi through Omni. Also made of ore, by Nephi's own hand.
4. Plates of Mormon — Mormon's abridgment of the large plates, plus his own additions. Gold plates.
5. Twenty-four gold plates — The Jaredite record, found by Limhi's people (Mosiah 8:9), translated by Mosiah as the Book of Ether. Gold plates.
6. Plates of Ether — Moroni's abridgment of the 24 gold plates.

The text explicitly states the purpose of metal plates: permanence. "Plates of brass should never perish; neither should they be dimmed any more by time" (1 Nephi 5:19). This is not incidental; the choice of metal over organic media is a deliberate preservation strategy presented within the narrative.

The practice spans the entire Nephite civilization (~600 BC to ~400 AD), roughly a thousand years. Records are passed from keeper to keeper, abridged, quoted, and cross-referenced. This is not a single inscription on a single plate. It is a continuous literary tradition conducted on metal.

The metals specified are: gold, brass (copper alloy), and generic "ore."

Scoring Criteria

Each model is scored 0-4 on how closely the real-world writing and record-keeping traditions of its proposed setting match the BOM's metal plate tradition during the relevant period (~600 BC to 400 AD):

• 4 = Full structural match. A systematic, multi-century tradition of inscribing sacred, legal, or historical records on metal plates, using metals consistent with the text (gold, copper/brass, or other), with an explicit preservation function.
• 3 = Strong match. Metal plate inscriptions attested in the region and period, but the tradition is less systematic or uses different metals or serves a different function than the text describes.
• 2 = Partial match. Metal plate inscriptions exist in the broader cultural sphere but are not well attested in the specific geography or period; or the tradition arrives through cultural transmission from elsewhere.
• 1 = Weak match. Writing systems exist and metalworking exists, but no tradition of combining the two into inscribed metal plates.
• 0 = No match. No writing system, no metalworking, or no intersection of the two.