rich lode

Translations
богатая жила
They discovered a rich lode of silver in the mountains.
Они обнаружили богатую жилу серебра в горах.
Definitions
A 'rich lode' refers to a vein or deposit of valuable minerals, especially one that contains a high concentration of precious metals like gold or silver. The term can also be used metaphorically to describe a plentiful or abundant source of something valuable.
Words
rich

adjective
богатый
lode

noun
месторождение