- Contract unit
- 100 troy ouncesCOMEX GC, minimum fineness 0.995 (CME COMEX Rulebook Ch. 113). About $405,000 notional with spot near $4,050 (2026-08-01).
- Tick
- $0.10/oz = $10.00Per contract. A $1.00/oz move is $100 per contract.
- Micro contract
- MGC, 10 troy ozOne tenth of GC: $0.10 tick = $1.00, a $1.00/oz move = $10. About $40,500 notional at the same level.
- Exchange
- COMEX (CME Globex)
- Hours
- Sun–Fri 18:00–17:00 ETOne-hour daily halt 17:00–18:00 ET (5:00 PM–4:00 PM CT with a 60-minute break).
- Months
- Feb, Apr, Jun, Aug, Oct, DecPhysically delivered; trading terminates the third-last business day of the delivery month.
- Exchange margin (GC)
- Roughly $10,000–$20,000 per contractDeliberately a range: published citations in mid-2026 run from stale $8,140 initial (NinjaTrader mirror) to ~$11,000–13,000, and margins move with volatility — check CME and your broker before sizing anything. MGC maintenance was $1,700 as of Oct 2025 (QuantVPS).
- CFD equivalent
- XAUUSD, 1 lot = 100 ozBroker convention, not exchange-defined: a $1.00 move on one standard lot is $100 — the same dollars-per-point as one GC.