Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Las Médulas' has mentioned 'Well' in the following places:
Occurrence Sentence Text Source
It was the most important gold mine, as well as the largest open-pit gold mine, in the entire Roman Empire.
The remains of such a system have been well studied at Dolaucothi Gold Mines, a smaller-scale site in South Wales.
Parts of the aqueducts are still well preserved in precipitous locations, including some rock-cut inscriptions.
The delegate from Thailand opposed the designation because he considered the site "a result of human destructive activities as well as harmful to the noble cause of environmental promotion and protection.