, the world's largest underground
copper mine.|alt=
Primary sector In the field of
agriculture, Rancagua serves as a central hub where most of the region's agricultural products are gathered before being exported through the ports of
San Antonio or
Valparaíso. In the
Cachapoal Valley, the sharp climatic contrasts between the slopes of the
Andes and the warmer plains of the central valley favor the production of generous red
wines.
Vines occupy around 80% of the planted area. The largest number of hectares are planted with
Cabernet Sauvignon, followed by
Merlot and
Carménère. For white wines,
Sauvignon Blanc and
Chardonnay predominate. About 50 minutes from the city, in the
Andes Mountains, lies the
El Teniente copper mine, currently operated by
Codelco Chile. This deposit is an important source of employment for the inhabitants of the
Rancagua conurbation. The
Braden Copper Company, the mine's former owner, played a fundamental role in the city's development up to the 1960s, in both material and cultural aspects. There is also small-scale mining activity in the
Chancón mining district, in the northwest area of the Rancagua commune. , one of Rancagua's main commercial avenues
Secondary and tertiary sectors Since the late , Rancagua has developed a wide range of
commercial activities. The main commercial hubs are the axis formed by
Paseo Independencia and Brasil Street, and in recent years, Eduardo Frei Montalva Avenue — also known as the
Carretera del Cobre (“Copper Highway”) — which leads to the
El Teniente copper deposits. This major city thoroughfare has seen remarkable commercial growth since the late 1990s, with the construction of several
shopping centers,
hypermarkets, commercial premises, services, and
medical institutions, which have significantly increased the
real estate value of the city's eastern sector. The city stands out nationally in the
agro-food industry. It is also home to the
automotive company Reborn Electric Motors, and the
metallurgical company ME-Elecmetal. It features industrial parks along the
Travesía Route and in the northern area of the city. == International relations ==