ANA Feature Traces California's Private Gold Coins of the Gold Rush Era

This article is based on an article by Ben Scott published under the American Numismatic Association's "Tales From the Vault" heading on October 21, 2025. It is a historical feature on the California Gold Rush, which followed the discovery of gold in January 1848, and the gold coins struck by private firms during that period. It does not report a new event.

Gold and a rush of people

In January 1848, carpenter James W. Marshall found gold in the tailrace of John Sutter's sawmill along the American River. Sutter and Marshall tried to keep the find secret, but the news soon leaked. Within weeks, the mill was virtually destroyed by thousands of people digging for gold.

On December 5, 1848, President James Polk proclaimed that gold had been found in California. According to the article, this started the largest mass migration in U.S. history, with more than 300,000 people heading west. Gold found totaled $10 million in 1849, $41 million in 1850, $75 million in 1851 and $81 million in 1852.

Assayers also went west. They turned the miners' nuggets, flakes and dust into ingots of varying fineness and weight that could be traded for their full value.

Why private gold coins appeared

The rapid rise in population created a shortage of coins in California. The U.S. Constitution (Article 1, Section 10) forbade states and territories from coining money, but the ban did not apply to private individuals or companies. Assayers produced standardized coins modeled on federal coinage to gain credibility, and these were widely accepted as a medium of exchange.

The first gold coin associated with the Gold Rush, however, was struck at the Philadelphia Mint. California's military governor sent 230 troy ounces (7.30 kg) of the new gold east. Much of it was made into medals honoring Mexican War heroes Zachary Taylor and Winfield Scott, and the rest was struck into $2 1/2 pieces stamped "CAL." Only 1389 were produced, and the article says they are now prized by American collectors.

Firms, coins and trust

Norris, Gregg & Norris is credited with striking the first gold coins in California. In May 1849, the newspaper Alta California reported the firm's $5 gold coin. Its obverse legend, CALIFORNIA GOLD WITHOUT ALLOY, assured miners that they were receiving the full melt value of their gold. Made from gold straight from the diggings, the coins had a naturally high silver content.

The Miners' Bank of San Francisco also struck gold pieces in 1849, but its $10 coins were not always accepted at face value. They also gained a reputation for being underweight. Because a gold coin's value depended on the gold it contained, light coins caused distrust. Firms such as J.S. Ormsby and the Pacific Company, which produced seriously deficient $5 and $10 pieces, quickly lost credibility. The article notes that coins from these firms are now very rare.

John L. Moffat & Co. issued small ingots from the summer of 1849 and later that year introduced $5 and $10 coins. They proved very popular, and the article says the firm's $5 coins are among the most abundant California gold pieces on the market today.

The charge against Baldwin & Co.

Between 1850 and 1851, Baldwin & Co. rose to rival Moffat & Co., issuing $5, $10 and $20 coins. Banker James King of William accused the firm of shorting its weights. On April 5, 1851, the Pacific News ran the headline "THE GOLD COIN SWINDLE," claiming a 5% gap between the stated weight and the actual gold content.

Merchants refused Baldwin coins, which sometimes traded at a 20% discount. Later assays found no serious deficiencies, but the accusations lingered. Most of Baldwin's coins were eventually melted, and the article says they are extremely rare today.

A federal assay office and the $50 "slugs"

Growing distrust of lightweight private coins led Congress to authorize a U.S. Assay Office in San Francisco instead of a full mint. The government contracted the expertise and facilities of Moffat & Co. The office's head, Augustus Humbert, introduced the $50 octagonal "slugs," stamped UNITED STATES ASSAY OFFICE OF GOLD.

Wass, Molitor & Co., which struck gold coins from 1852 to 1855, copied the $50 slugs. Its $5, $10, $20 and $50 pieces were popular because of their consistent 0.900 fineness. The firm's 1855 $50 coin was the only round $50 piece that circulated in California at the time.

Kellogg & Co. and modern restrikes

Kellogg & Co. issued some of the last private gold coins in California. While Humbert reorganized Moffat & Co. into the permanent San Francisco Mint, Kellogg produced as much as $60,000 to $80,000 worth of $20 coins per day. Only a dozen of the firm's original $50 Liberty head round pieces are known today, but the dies survived. When the wreck of the Central America was salvaged in 1988, more than 500 ingots were recovered, including one over 80 lbs. Modern restrikes were made from recovered Kellogg gold using a copy of the original Liberty head dies.

The donated collection

The collection featured in the article was donated by Dr. Carlson Chambliss and includes pieces from nearly every issuing firm. Once the San Francisco Mint opened in 1854 and began issuing federal coinage by 1855, the era of private California gold pieces came to an end.

Source: American Numismatic Association, "Tales From the Vault – Golden California: The Era of Private Coinage" (October 21, 2025).