Gold Futures COMEX: How the 100-Ounce Contract Trades

Key Takeaways

• Gold futures COMEX covers 100 troy ounces per contract under the symbol GC, settled by physical delivery.
• The minimum price move is 10 cents per ounce, worth 10 dollars per contract.
• Most traders never take delivery, they close or roll positions before expiry to avoid the warehouse process.
• The futures price tracks spot gold closely, with the gap driven mainly by interest rates and storage cost.

What It Is

Gold futures COMEX is a standardized agreement to deliver or receive 100 troy ounces of gold at a set price on a future date. The contract trades under the symbol GC on CME Globex, the electronic platform that runs nearly 24 hours a day. COMEX is the metals division of CME Group, the exchange that lists the contract and guarantees both sides through its clearing house.

Because every term is fixed by the exchange, buyers and sellers only negotiate price. The standardization is what gives the contract its deep liquidity and makes its settlement price a global reference.

The Intuition

A futures contract lets you lock in a price today for metal that changes hands later. A jeweler worried about rising costs can buy a contract to fix the price of future gold. A miner worried about falling prices can sell one to lock in revenue. Speculators take the other side, betting on direction and providing liquidity.

You do not need the full value of the gold to trade. You post margin, a good-faith deposit set by the exchange, which is a fraction of the contract value. That leverage magnifies both gains and losses, which is the central risk of futures.

How Gold Futures COMEX Works

The core specifications define everything you trade:

Contract unit:   100 troy ounces
Symbol:          GC
Price quote:     US dollars per troy ounce
Minimum tick:    0.10 per ounce = 10.00 per contract
Settlement:      physical delivery
Delivery grade:  minimum 995 fineness, exchange-approved brand

The 100-ounce size means a quoted price of 2,000 dollars represents a contract worth 200,000 dollars. Each one-cent move in the quote changes the contract value by one dollar, so the 10-cent minimum tick equals 10 dollars.

Delivered gold must assay to at least 995 fineness and carry the stamp of a refiner the exchange approves. The contract allows a weight tolerance of 5 percent above or below 100 ounces, since refined bars do not come in exact weights. Most participants close out before the delivery window, so physical delivery is the exception rather than the rule.

Worked Example

Suppose you buy one GC contract at 2,050.00 dollars per ounce.

Contract value = 100 oz x 2,050.00 = 205,000 dollars

The price then rises to 2,062.00. The move is 12.00 dollars per ounce.

Gain = 100 oz x 12.00 = 1,200 dollars

If the exchange required 11,000 dollars of initial margin, that 1,200-dollar gain is roughly an 11 percent return on the margin posted, even though gold itself moved less than 1 percent. The same leverage works against you if the price falls 12 dollars, producing a 1,200-dollar loss and possibly a margin call. This is why position sizing matters more in futures than in cash markets.

Common Mistakes

1. Confusing contract value with capital at risk. A single contract controls 200,000 dollars of gold on a small margin deposit. Sizing as if you only risk the margin ignores how fast losses compound.
2. Forgetting the delivery window. Holding a long contract into the delivery period can obligate you to take and pay for physical gold. Close or roll before first notice day unless you intend to deliver.
3. Treating futures price as identical to spot. Futures usually trade above spot by the cost of carry. The gap converges to zero at expiry but is real before then.
4. Ignoring margin changes. Exchanges raise margin during volatile periods. A position that was comfortable can suddenly require more cash on short notice.
5. Using the full-size contract when smaller fits better. Micro and mini gold contracts exist for traders who want exposure without the 100-ounce notional. Many beginners overcommit by starting with GC.

Frequently Asked Questions

What is gold futures COMEX in simple terms? Gold futures COMEX is a standard contract to buy or sell 100 ounces of gold at a price agreed now for delivery later. It trades on the COMEX exchange and sets the headline gold price most markets quote.

How does gold futures COMEX affect investment decisions? The futures price is the live benchmark for gold, so it anchors pricing for coins, bars, and gold funds. Traders use it to gain leveraged exposure or to hedge a physical position without moving metal.

What is a real-world example of gold futures COMEX? A buyer purchases one GC contract at 2,050 dollars per ounce, controlling 205,000 dollars of gold. A 12-dollar rise produces a 1,200-dollar gain on a margin deposit of around 11,000 dollars.

How can investors use gold futures COMEX effectively? Match position size to total account risk, not just margin, and always know the first notice and last trading dates. Consider micro contracts to keep notional exposure proportional to your account.

How is gold futures COMEX different from the London bullion price? COMEX gold is an exchange-traded futures contract with daily margin and a delivery process. The London bullion price is a twice-daily auction benchmark for spot metal, run by ICE Benchmark Administration for the LBMA.

Sources

1. CME Group. Gold Futures Contract Specs. https://www.cmegroup.com/markets/metals/precious/gold.contractSpecs.html
2. CME Group. COMEX Rulebook Chapter 113, Gold Futures. https://www.cmegroup.com/rulebook/COMEX/1a/113.pdf
3. CME Group. Gold Product Overview. https://www.cmegroup.com/education/lessons/product-gold
4. LBMA. About LBMA Daily Auction Prices. https://www.lbma.org.uk/prices-and-data/about-lbma-daily-auction-prices

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.