# Sumitomo Metal Mining x Rio Tinto revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Partnership: [Sumitomo Metal Mining x Rio Tinto](/partnerships/sumitomo-metal-mining-x-rio-tinto.md)

## Recorded posture

- First recorded event: 2026-08-22
- Last material change: 2026-08-22
- Material event count: 1
- Editorial event count: 0

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /partnerships/sumitomo-metal-mining-x-rio-tinto/history. REST: /v1/partnerships/9b447efa-5fb5-463a-b669-86d44c53fe1f/history. HTML: [/partnerships/sumitomo-metal-mining-x-rio-tinto/history](/partnerships/sumitomo-metal-mining-x-rio-tinto/history)._