A republic that named both metals
The Coinage Act of 1792 wrote gold and silver into United States law and fixed a mint ratio of fifteen to one. The dollar was a unit that could be paid in either metal at that legal relation. Which metal actually stayed in circulation was decided by the market ratio abroad, not by the preamble. When world prices moved, Gresham’s pattern appeared: the legally overvalued metal stayed; the other was exported or hoarded.
This page is the opening statute of the America chapter — not a romance of founding fathers, and not a pitch to hold coin. It names the mint ratio, the Spanish silver that shaped the dollar, and the 1834 correction. The later silver fight of 1873 and the gold statute of 1900 sit downstream. Start here for the arithmetic that made those fights possible.
What the Coinage Act of 1792 did
Congress established a Mint and defined the dollar in both gold and silver. A silver dollar was to contain 371.25 grains of pure silver. Gold coins were set so that fifteen ounces of pure silver equaled one ounce of pure gold at the Mint. That 15:1 ratio was the legal bridge between the two metals.
The Act also named smaller silver coins and gold eagles, half-eagles, and quarter-eagles. Copper cents and half-cents covered small change. The design was bimetallic in law: either metal could settle a dollar debt at the posted weights. The statute did not invent money. It named a unit and a ratio for a republic that already traded in Spanish dollars and foreign coin.
Hamilton’s Report on the Establishment of a Mint (1791) had argued for a bimetallic dollar and for a ratio close to market practice. The 1792 Act is the legislative result. Later politics would treat “bimetallism” as a slogan. In 1792 it was a mint board: two metals, one legal unit, a fixed conversion.
The Spanish dollar in the background
The early United States did not invent its silver weight from blank paper. The Spanish eight-real piece — the piece of eight — had long been the common dollar of Atlantic trade. American contracts and statutes often meant that coin when they said “dollar.” The 1792 silver weight sat close to that familiar piece.
Foreign coin remained legal tender for years. The Mint was slow to supply enough domestic pieces. Circulation was a mix of Spanish and other foreign silver, scarce gold, and bank notes of uneven quality. The statute named an American unit. Daily payment still used what was in the bag.
That continuity matters for these pages. Potosí silver and Spanish minting had already made a global silver coin. The United States adopted a dollar that traders already understood, then wrote gold beside it at a fixed ratio. Bimetallism carries the mechanics of two metals under one law. This page carries the American opening.
Mint ratio versus market ratio
A mint ratio is a legal price: how many ounces of silver equal one ounce of gold at the Mint. A market ratio is what traders actually pay in London, Amsterdam, or Paris. When the two drift, arbitrage follows. The metal that is cheaper at the Mint relative to the world is brought in for coinage. The metal that is dearer at the Mint is melted, exported, or hoarded.
That is Gresham’s pattern in mint dress: the legally overvalued metal stays in circulation; the undervalued metal leaves. The statute does not defeat the scale. Bimetallism is the general claim. Early U.S. coinage is the American instance.
Through the early nineteenth century, silver often looked cheap at 15:1 relative to European gold–silver prices. Gold tended to leave. The republic’s circulating coin leaned silver. The legal bridge still said both metals. The till said otherwise.
The 1834 correction
In 1834 Congress changed the gold content of the eagle so that the mint ratio moved toward roughly 16:1. The intent was gold-friendlier: to bring gold back into circulation by making an ounce of gold buy more silver at the Mint than before.
After 1834, gold coins became more common in domestic use. Silver dollars and smaller silver still mattered, but the legal tilt had shifted. The arithmetic is the same as 1792 — a fixed ratio meeting a moving market — only the numbers changed. The later omission of the standard silver dollar in 1873 sits on this path: once the system leaned gold, dropping free coinage of the silver dollar was easier to frame as clarification.
Do not read 1834 as the end of silver politics. Subsidiary silver and later “free silver” campaigns still filled the century. Read it as a ratio change that showed the Mint could rewrite the bridge when circulation failed the preamble.
A short timeline
- 1791: Hamilton’s mint report argues for a bimetallic dollar and a practical gold–silver ratio.
- 2 April 1792: Coinage Act; Mint established; silver dollar at 371.25 grains pure; gold at 15:1.
- 1790s–1820s: Foreign silver (especially Spanish dollars) remains central to circulation; gold often scarce at 15:1.
- 1834: Gold content of the eagle adjusted; mint ratio moves toward ~16:1; gold returns more readily to the till.
- Later in this chapter: Jackson’s bank war, greenbacks, the Coinage Act of 1873, resumption, Gold Standard Act 1900.
What this page is not
This page is not a collector guide, not a bullion pitch, and not a price target for either metal. It is the statute that named both metals and a ratio — and the market arithmetic that decided which metal stayed.
Return to America & gold/silver politics. Next monetary fight in this chapter: Jackson and the Bank. The silver question’s loud American event is the Crime of 1873. For the coin that shaped the dollar: piece of eight.