Saint John d'El Rey Mining Company
British gold-mining company established in 1830 that operated extensive mines in Minas Gerais, Brazil.
Last updated August 26, 2026
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Overview
The Saint John d'El Rey Mining Company was a British joint-stock mining enterprise established in April 1830 to develop gold properties in Minas Gerais, Brazil. Its early venture at the São João del-Rei mines encountered low-grade ore, legal disputes, and operational difficulties, and the original undertaking was abandoned within roughly two years. The company then searched for more promising properties and acquired the Morro Velho mine near Nova Lima in 1834, making it the central asset of a long-lived Brazilian mining operation. Morro Velho had been worked before the company acquired it, initially through open-pit methods. Saint John d'El Rey invested in infrastructure, underground development, and the recruitment of skilled British miners, particularly workers from Cornwall. The mine became sufficiently productive to pay its first dividends in 1842 and later became one of the most technically significant deep mines in the world. At its greatest recorded depth, workings extended approximately 2,545 metres below the entrance adit. The company's Brazilian portfolio also included the Raposos group and properties such as Morro das Bicas, Bella Fama, Bicalho, Gaia, Faria, Gabirobas, and Urubu. The company's labor history reflected both British industrial migration and the coercive labor system of nineteenth-century Brazil. It employed Cornish and other British miners while also using enslaved Black labor. In 1845, it entered an agreement with the Cata Branca company to rent 385 enslaved people for fourteen years. The agreement stated that the workers would be emancipated at the end of the term, but the promised emancipation was not honored when the fourteen years ended in 1859. Contemporary criticism and pressure from Brazilian abolitionists eventually contributed to the release of the affected people. The episode became an important example of the contradiction between the company's British identity and its participation in slavery in Brazil. Morro Velho suffered major setbacks. A fire in 1867 caused a collapse and kept the mine out of operation for about seven years. In the 1870s, a superintendent was dismissed after fraud was discovered. Another rock fall in 1886 led to a second collapse and temporary liquidation. The mine was subsequently reopened and returned to profitability during the 1890s. Other properties were explored or intermittently developed, with results varying according to ore quality, engineering conditions, gold prices, and access to underground workings. During the twentieth century, the Raposos mines became an important operating group. Systematic exploration shortly before 1910 identified lodes including Mina Grande, Espírito Santo, and Morro das Bicas. The Bicalho and Gaia-Faria areas also received renewed exploration, drainage, and access works. The company drove the Gaia tunnel during the 1930s to unwater old workings and reach deeper mineralized zones, while regular production at Faria began in 1940. Some exploration was curtailed in 1937 because of weak gold prices, and Faria production was suspended in 1947. After the Brazilian Revolution of 1930, a miners' union was formed at Morro Velho. Strikes reduced output and contributed to deterioration of infrastructure. By 1957, the company still operated the Morro Velho mine and the Raposos group. That year, investors acquired a controlling interest and sold the company's iron properties to Hanna Mining Company of Cleveland, Ohio. The Saint John d'El Rey Mining Company was formally closed in 1985. Its legacy combines important contributions to the development of Brazilian deep-level gold mining with a record involving enslaved labor, industrial accidents, labor conflict, and the risks of foreign-controlled resource extraction.
History
The company was established in Britain in April 1830 as a joint-stock enterprise, with John Diston Powles as its first chairman. Its initial purpose was to exploit the São João del-Rei mines in Minas Gerais under a lease obtained from three British merchants and a German physician. Cornish miners and other British workers traveled to Brazil in June and July of that year. The original concession proved unsuccessful because of low-grade ore, disputes over rights, and operational problems, and it closed within approximately two years. Seeking better prospects, the company purchased the Morro Velho mine near Nova Lima in 1834. The property had already been worked for several decades and was initially operated as an open pit. Company investment in infrastructure and underground development increased output, and the first dividends were paid in 1842. Saint John d'El Rey recruited large numbers of Cornish miners; around 350 Cornish workers were associated with Morro Velho in the 1860s. The company also acquired or controlled several other properties, including the Raposos mines, Morro das Bicas, Bella Fama, Gaia, Faria, Gabirobas, Bicalho, and Urubu. Its operations depended on both skilled wage labor and enslaved labor. In 1845, the company entered a fourteen-year agreement with the Cata Branca company for the use of 385 enslaved people. The contract stipulated that they would become free at the end of the term, but the promised emancipation was disregarded in 1859. A later report condemned the continued enslavement of approximately 200 people who should have been freed under the agreement. Brazilian authorities eventually secured their liberation after pressure from local abolitionists. The case became one of the earlier controversies associated with the movement that culminated in Brazil's abolition of slavery in 1888. Morro Velho's history was marked by dangerous geological and industrial conditions. A fire in 1867 caused the mine to collapse, and restoring it took seven years. During the 1870s, the superintendent was dismissed for fraud. A rock fall in 1886 caused another collapse and resulted in temporary liquidation. The mine was later reopened and became profitable again in the 1890s. At its deepest documented point, the workings reached about 2,545 metres below the entrance adit, making Morro Velho one of the deepest mines in the world at the time. The Raposos area became increasingly important during the twentieth century. Systematic exploration began shortly before 1910, identifying the Mina Grande and Espírito Santo lodes west of the Rio das Velhas and the Morro das Bicas lode to the east. Between 1910 and 1928, the Raposos mines produced 23,404 tonnes of ore and 8,388 ounces of gold. By the mid-1950s, the principal lodes were interconnected by underground workings and reached approximately 640 metres in depth. The company also pursued exploration at Bicalho and in the Gaia, Faria, and Gabirobas area. It drove an access and drainage tunnel at Honório Bicalho during the 1930s, extending the works toward the Faria mine. Gabirobas and Gaia were pumped and explored, but some work stopped in 1937 because of low gold prices. Faria entered regular production in 1940 and milled 176,286 tonnes of ore between 1940 and 1947, when production was suspended. Bicalho produced gold during 1940–41 and 1942–43, but operations ended after limited activity in 1946. Labor organization became more prominent after the Brazilian Revolution of 1930. A miners' union formed at Morro Velho, and strikes reduced production. In addition, infrastructure fell into disrepair. By 1957, Morro Velho and the Raposos group were the company's two active mining centers. Investors acquired control that year and divested the company's iron properties to Hanna Mining Company of Cleveland, Ohio. The Saint John d'El Rey Mining Company was formally closed in 1985. The enterprise therefore occupies a significant but contested place in the history of Brazilian gold mining: it helped develop deep underground mining and transnational technical labor networks, while also participating in slavery and facing repeated safety, governance, labor, and commodity-price challenges.
- 1985
Formal closure
[1]The company was formally closed.
- 1957
Control changes and iron-property divestment
[1]Investors acquired control and the company's iron assets were sold to Hanna Mining Company.
- 1930
Union formed at Morro Velho
[1]Miners organized a union, followed by strikes that reduced production.
- 1886
Second major collapse
[1]A rock fall led to another collapse and temporary liquidation before the operation was restored.
- 1867
Morro Velho collapse
[1]A fire caused a major collapse that kept the mine closed for approximately seven years.
- 1845
Enslaved-labor agreement
[1]The company entered a contract to rent 385 enslaved people, with a contractual promise of emancipation after fourteen years.
- 1842
First dividends
[1]Morro Velho's improved performance allowed the company to pay its first dividends.
- 1834
Morro Velho acquired
[1]The company purchased Morro Velho near Nova Lima after abandoning its unsuccessful original concession.
- 1830
Company established
[1]The Saint John d'El Rey Mining Company was formed in Britain as a joint-stock company to develop gold mines in Minas Gerais.
Products and positioning
Historical British gold-mining operator focused on underground extraction and exploration in Minas Gerais, Brazil.
Precious-metal mining · 1830
Gold
Gold was the company's principal product. It extracted and processed gold-bearing ore from underground and surface workings in Minas Gerais, especially at Morro Velho and the Raposos group. Production depended on deep mine development, drainage, transportation infrastructure, and exploration of lodes with varying grades.
Iron mining
Iron properties
The company held iron properties in addition to its gold assets. These properties were sold to Hanna Mining Company after investors acquired a controlling interest in 1957.
Controversies
1870
Superintendent dismissed for fraud
During the 1870s, the superintendent of Morro Velho was found to have engaged in fraud and was removed from office.
1859
Failure to emancipate contracted enslaved workers
A 1845 agreement covering 385 enslaved workers stated that they would be emancipated after fourteen years. When the term ended in 1859, the company did not honor the provision. Later criticism reported that roughly 200 people remained enslaved until Brazilian authorities intervened after pressure from abolitionists.
Brand decisions
1957
Control acquisition and sale of iron assetsM&ABackground
The company continued to operate Morro Velho and the Raposos group but underwent a change in ownership.
Action taken
A group of investors acquired a controlling interest and sold the company's iron properties to Hanna Mining Company.
Aftermath
The company continued with its principal gold operations before being formally closed in 1985.
1934
Development of the Gaia tunnelStrategyBackground
The company sought to drain old workings and obtain access to deeper levels in the Gaia and Faria area.
Action taken
It began driving an underground adit from Honório Bicalho toward the Gaia and Faria mines.
Aftermath
The tunnel reached the foot of the Faria mine in 1936, while exploration at some nearby workings was later curtailed because of low gold prices.
1834
Shift from São João del-Rei to Morro VelhoStrategyBackground
The company's original concession suffered from low-grade ore, legal disputes, and operational difficulties.
Action taken
The company abandoned the initial venture and purchased the Morro Velho mine near Nova Lima.
Aftermath
Morro Velho became the company's principal long-term asset and later one of the world's deepest mines.
Recent events
- 1985
Company formally closed[1]
Bankruptcy
The Saint John d'El Rey Mining Company was formally dissolved.
- 1957
Controlling interest acquired and iron properties sold[1]
M&A
Investors acquired control of the company and sold its iron properties to Hanna Mining Company.
- 1930
Union formation and strikes at Morro Velho[1]
Other
Following the Brazilian Revolution, miners organized a union; subsequent strikes reduced production and coincided with deteriorating infrastructure.
- 1886
Morro Velho rock fall leads to temporary liquidation[1]
Bankruptcy
A further rock fall caused another collapse and placed the company in temporary liquidation before the mine was reopened.
- 1867
Morro Velho fire and collapse[1]
Other
A fire caused a major collapse at Morro Velho, and the mine took approximately seven years to return to operation.
- 1842
First dividends paid[1]
Other
Improved performance at Morro Velho enabled the company to distribute its first dividends.
- 1834
Company acquires the Morro Velho mine[1]
Other
After difficulties at its original São João del-Rei concession, the company purchased Morro Velho near Nova Lima and made it the core of its Brazilian operations.
- 1830
Saint John d'El Rey Mining Company established in Britain[1]
Other
The company was formed as a British joint-stock enterprise to work gold mines in Minas Gerais.
Sources1 sources
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