Koyelga marble quarry, Industrial marble quarry in Yetkulsky District, Russia.
The Koyelga marble quarry is a large excavation site in Yetkulsky District with steep rock faces and deep water-filled sections formed by extraction over centuries. The quarry walls display bands of light-colored marble layered in the earth.
The marble deposit was discovered in 1765 and extraction began in 1769. Since then, this location became a major supplier of marble for St. Petersburg and Russian construction projects.
The marble from this quarry was used in major buildings in St. Petersburg, including St. Isaac's Cathedral and the Marble Palace. These stones remain visible in the city's most important structures.
This is an active extraction site where access may be restricted, so visitors should check locally before planning a visit. The edges are steep and the ground can be slippery, especially during wet weather.
The water pools inside the quarry are remarkably clear, allowing visitors to see deep below the surface in a way that makes the extraction process visually striking. This clarity comes from the limestone-rich environment created by marble dust.
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